how can I add a UISwitch to a specific UIScrollView? As I guess it can be done with a tag, but I am having difficulties.
EDIT: The problem was solved in the usual way, lol
My example code with UIScrollView and UISwitch:
#implementation NSPage {
UIScrollView *scrolled;
UISwitch *switchPage;
NSInteger *keyS;
}
NSPage *page = [[NSPage alloc]init];
Here i am creating a UIScrollView and UISwitch:
-(id)initPage:(NSString *)titleScroll keyScroll:(NSInteger)keyScroll_ {
keyS = keyScroll_;
scrolled = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 180, 110)];
scrolled.tag = keyS;
scrolled.backgroundColor = [UIColor grayColor];
[window addSubview:scrolled];
}
//get scroll tag
-(NSInteger)getScrollKey {
return scrolled.tag = keyS;
}
//UISwitch
-(id)initSwitch:(NSString *)title_ keySwitch:(NSInteger)keySwitch_ {
scrollSwitch += 40;
switch_ = [[UISwitch alloc]initWithFrame:CGRectMake(15, scrollSwitch - 40, 40, 40)];
switch_.tag = keySwitch_;
if([self getScrollKey] == switch_.tag) {
[scrolled addSubview:switch_];
}
}
#end
Everything seemed to be fine, but when I add a scrolls and switches, then my UISwitch is not displayed:
page = [[NSPage alloc]initPage:#"test page" keyScroll:256];
page = [[NSPage alloc]initSwitch:#"test" keySwitch:256];
What could be my mistake, how can I add a UISwitch to a specific UIScrollView? I'm a beginner, Thanks for the help anyway
if([self getScrollKey] == switch_.tag) {
This line does nothing take it out
Related
while presenting the search controller i am setting the showScopeBar property to hide or show the scope bar
- (void)willPresentSearchController:(UISearchController *)searchController {
// do something before the search controller is presented
NSMutableArray *scopeArray = #[#"All"].mutableCopy;
UISearchBar *searchBar =_searchController.searchBar;
if (![labelDepartmentSelection.text isEqualToString:#"Department"]) {
[scopeArray addObject:#"Department"];
}
if (![labelJobSelection.text isEqualToString:#"Job"]) {
[scopeArray addObject:#"Job"];
}
searchBar.scopeButtonTitles = scopeArray;
searchBar.showsScopeBar = scopeArray.count>1;
[searchBar layoutIfNeeded];
NSArray *subviews = searchBar.subviews;
if([[UIDevice currentDevice].systemVersion floatValue]>=7.0) {
//Get search bar with scope bar to reappear after search keyboard is dismissed
UIView *scopeBar = [subviews.firstObject subviews].firstObject;
[scopeBar setHidden:NO];
CGRect frame = scopeBar.frame;
frame.origin.y = frame.origin.y = 64.0;
scopeBar.frame = frame;
}
[searchBar layoutSubviews];
[searchBar sizeToFit];
[serviceOptionTableView setContentInset:UIEdgeInsetsMake(scopeArray.count>1?44:0, 0, 0, 0)];
serviceOptionTableView.tableHeaderView = searchController.searchBar;
}
and when i simply hide and show the scope bar base on the scope titles i want it giet distorted
here is the case for this
- (void)willPresentSearchController:(UISearchController *)searchController {
// do something before the search controller is presented
NSMutableArray *scopeArray = #\[#"All"\].mutableCopy;
UISearchBar *searchBar =_searchController.searchBar;
if (!\[labelDepartmentSelection.text isEqualToString:#"Department"\]) {
\[scopeArray addObject:#"Department"\];
}
if (!\[labelJobSelection.text isEqualToString:#"Job"\]) {
\[scopeArray addObject:#"Job"\];
}
searchBar.scopeButtonTitles = scopeArray;
searchBar.showsScopeBar = scopeArray.count>1;
\[serviceOptionTableView setContentInset:UIEdgeInsetsMake(scopeArray.count>1?44:0, 0, 0, 0)\];
}
this is the image of case 2
The issue should fix itself if you remove the line:
searchBar.showsScopeBar = scopeArray.count>1;
Setting the showScopeBar property has a weird effect for some reason. Removing it allows the default animation behaviour without any issues.
So I have an app that behaves like a photo gallery and I'm implementing the ability for the user to delete the images. Here is the setup: I have 9 UIImageViews, imageView, imageView2, etc. I also have an "Edit" button, and a tapGesture action method. I dragged a Tap Gesture Recognizer over onto my view in IB, and attached it to each one of the UIImageViews. I also attached the tapGesture action method to each of the UIImageViews. Ideally, I would like the method to only become active when the "Edit" button is pressed. When the user taps Edit, then taps on the picture they want to delete, I would like a UIAlertView to appear, asking if they are sure they want to delete it. Here is the code I'm using:
- (IBAction)editButtonPressed:(id)sender {
editButton.hidden = YES;
backToGalleryButton.hidden = NO;
tapToDeleteLabel.hidden = NO;
}
- (IBAction)tapGesture:(UITapGestureRecognizer*)gesture
{
UIAlertView *deleteAlertView = [[UIAlertView alloc] initWithTitle:#"Delete"
message:#"Are you sure you want to delete this photo?"
delegate:self
cancelButtonTitle:#"No"
otherButtonTitles:#"Yes", nil];
[deleteAlertView show];
if (buttonIndex != [alertView cancelButtonIndex]) {
UIImageView *view = [self.UIImageView];
if (view) {
[self.array removeObject:view];
}
CGPoint tapLocation = [gesture locationInView: self.view];
for (UIImageView *imageView in self.view.subviews) {
if (CGRectContainsPoint(self.UIImageView.frame, tapLocation)) {
((UIImageView *)[self.view]).image =nil;
}
}
[self.user setObject:self.array forKey:#"images"];
}
}
This code is obviously riddled with errors:
"Use of undeclared identifier button index" on this line: if (buttonIndex != [alertView cancelButtonIndex])
"Property UIImageView not found on object of type PhotoViewController" on this line UIImageView *view = [self.UIImageView];
And "Expected identifier" on this line ((UIImageView *)[self.view]).image =nil;
I'm very new to programming, and I'm surprised that I even made it this far. So, I'm just trying to figure out how I need to edit my code so that the errors go away, and that it can be used whenever one of the 9 image views is tapped, and also so that this method only fires when the Edit button is pushed first. I was using tags earlier, and it worked great, but I save the images via NSData, so I can't use tags anymore. Any help is much appreciated, thanks!
First, you don't want to attach the tap gesture to the image views. Also, if you are going to have more than 9 images, you may want a scroll view, or handle scrolling separately. First, remove that gesture recognizer and all its connections.
Next, determine what type of view you will use as your gallery canvas. A simple View, or a ScrollView, or whatever... it doesn't really matter right now, just to get it working. You want to ctrl-drag that view into your interface definition, so it drops an IBOutlet for the view (that way you can reference it in code).
You will place your ImageViews onto the view I just mentioned.
You can have an internal flag for the gesture recognizer, but it also has a property that use can enable/disable it whenever you want. Thus, you can have it active/inactive fairly easily.
All you want to do is drop a single tap-gesture-recognizer onto your controller, and connect it to the implementation section of the controller. It will generate a stub for handling the recognizer. It will interpret taps "generally" for the controller, and call your code whenever a tap is made on the view.
Some more code...
Creates a frame for the "new" image in the scroll view.
- (CGRect)frameForData:(MyData*)data atIndex:(NSUInteger)idx
{
CGPoint topLeft;
int row = idx / 4;
int col = idx % 4;
topLeft.x = (col+1)*HORIZ_SPACING + THUMBNAIL_WIDTH * (col);
topLeft.y = (row+1)*VERT_SPACING + THUMBNAIL_HEIGHT * (row);
return CGRectMake(topLeft.x, topLeft.y, THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT);
}
Creates an image view for each piece of metadata, and a small border.
- (UIImageView*)createImageViewFor:(MetaData*)metadata
{
UIImageView *imageView = [[UIImageView alloc] initWithImage:metadata.lastImage];
imageView.frame = CGRectMake(0, 0, THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT);;
imageView.layer.borderColor = [[UIColor blackColor] CGColor];
imageView.layer.borderWidth = 2.0;
imageView.userInteractionEnabled = YES;
return imageView;
}
This is where the views are created and added to the parent...
imageView = [self createImageViewFor:metadata];
//[data.imageView sizeToFit];
// Make sure the scrollView contentSize represents the data
CGRect lastFrame = [self frameForData:data atIndex:self.data.count-1];
CGFloat newHeight = lastFrame.origin.y + lastFrame.size.height;
if (self.bookshelfScrollView.contentSize.height < newHeight) {
CGSize newSize = self.bookshelfScrollView.contentSize;
newSize.height = newHeight;
self.bookshelfScrollView.contentSize = newSize;
}
[self.bookshelfScrollView addSubview:data.imageView];
So, you just create each frame, add them to the view, and the only thing you have to do is enable user interaction on them, because otherwise the scroll view does not allow the gesture through.
OK... Looking at the code you posted... since you didn't say what was wrong with it... hard to say... The below is your code... My comments are, well, Comments...
- (IBAction)editButtonPressed:(id)sender {
editButton.hidden = YES;
backToGalleryButton.hidden = NO;
tapToDeleteLabel.hidden = NO;
}
- (IBAction)tapGesture:(UITapGestureRecognizer*)gesture
{
// I don't think I'd do this here, but it shouldn't cause "problems."
UIAlertView *deleteAlertView = [[UIAlertView alloc] initWithTitle:#"Delete"
message:#"Are you sure you want to delete this photo?"
delegate:self
cancelButtonTitle:#"No"
otherButtonTitles:#"Yes", nil];
[deleteAlertView show];
// In your controller, you have the main view, which is the view
// on which you added your UIViews. You need that view. Add it as an IBOutlet
// You should know how to do that... ctrl-drag to the class INTERFACE source.
// Assuming you name it "galleryView"
// Take the tap location from the gesture, and make sure it is in the
// coordinate space of the view. Loop through all the imageViews and
// find the one that contains the point where the finger was taped.
// Then, "remove" that one from its superview...
CGPoint tapLocation = [gesture locationInView: self.galleryView];
for (UIImageView *imageView in self.galleryView.subviews) {
if (CGRectContainsPoint(imageView.frame, tapLocation)) {
[imageView removeFromSuperview];
}
}
}
Personally, in my little photo gallery, I bypassed all of the gesture recognizer stuff by replacing the UIImageView controls with UIButton controls, setting the image property for the button like you would for the UIImageView. It looks identical, but then you get the functionality of tapping on a thumbnail for free, with no gestures needed at all.
So, my view just has a UIScrollView, which which I programmatically add my images as buttons with the image set for the button control, e.g.:
- (void)loadImages
{
listOfImages = [ImageData newArrayOfImagesForGallery:nil];
// some variables to control where I put my thumbnails (which happen to be 76 x 76px)
int const imageWidth = 76;
int const imageHeight = imageWidth;
NSInteger imagesPerRow;
NSInteger imagePadding;
NSInteger cellWidth;
NSInteger cellHeight;
// some variables to keep track of where I am as I load in my images
int row = 0;
int column = 0;
int index = 0;
// add images to navigation bar
for (ImageData *item in listOfImages)
{
// figure out what row and column I'm on
imagesPerRow = self.view.frame.size.width / (imageWidth + 2);
imagePadding = (self.view.frame.size.width - imageWidth*imagesPerRow) / (imagesPerRow + 1);
cellWidth = imageWidth + imagePadding;
cellHeight = imageHeight + imagePadding;
// this is how I happen to grab my UIImage ... this will vary by implementation
UIImage *thumb = [item imageThumbnail];
// assuming I found it...
if (thumb)
{
// create my button and put my thumbnail image in it
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(column * cellWidth + imagePadding,
row * cellHeight + imagePadding,
imageWidth,
imageHeight);
[button setImage:thumb forState:UIControlStateNormal];
[button addTarget:self
action:#selector(buttonClicked:)
forControlEvents:UIControlEventTouchUpInside];
button.tag = index++;
[[button imageView] setContentMode:UIViewContentModeScaleAspectFit];
// add it to my view
[scrollView addSubview:button];
// increment my column (and if necessary row) counters, making my scrollview larger if I need to)
if (++column == imagesPerRow)
{
column = 0;
row++;
[scrollView setContentSize:CGSizeMake(self.view.frame.size.width, (row+1) * cellHeight + imagePadding)];
}
}
}
}
// I also have this in case the user changes orientation, so I'll move my images around if I need to
- (void)rearrangeImages
{
if (!listOfImages)
{
[self loadImages];
return;
}
// a few varibles to keep track of where I am
int const imageWidth = 76;
int const imagesPerRow = self.view.frame.size.width / (imageWidth + 2);
int const imageHeight = imageWidth;
int const imagePadding = (self.view.frame.size.width - imageWidth*imagesPerRow) / (imagesPerRow + 1);
int const cellWidth = imageWidth + imagePadding;
int const cellHeight = imageHeight + imagePadding;
NSArray *buttons = [[NSArray alloc] initWithArray:[scrollView subviews]];
int row;
int column;
int index;
CGRect newFrame;
// iterate through the buttons
for (UIView *button in buttons)
{
index = [button tag];
if ([button isKindOfClass:[UIButton class]] && index < [listOfImages count])
{
// figure out where the button should go
row = floor(index / imagesPerRow);
column = index % imagesPerRow;
newFrame = CGRectMake(column * cellWidth + imagePadding,
row * cellHeight + imagePadding,
imageWidth,
imageHeight);
// if we need to move it, then animation the moving
if (button.frame.origin.x != newFrame.origin.x || button.frame.origin.y != newFrame.origin.y)
{
[UIView animateWithDuration:0.33 animations:^{
[button setFrame:newFrame];
}];
}
}
}
NSInteger numberOfRows = floor(([listOfImages count] - 1) / imagesPerRow) + 1;
[scrollView setContentSize:CGSizeMake(self.view.frame.size.width, numberOfRows * cellHeight + imagePadding)];
}
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
[self rearrangeImages];
}
Hopefully this gives you an idea of how you can programmatically add a UIButton to act as an image in a gallery. I've tried to edit this on the fly, so I apologize in advance if I introduced any errors in the process, but it should give you a sense of what you could conceivably do ... I removed my code to do this in a separate GCD queue (which I do because I have close to 100 images, and doing this on the main queue is too slow.)
Anyway, you can then create your buttonClicked method to do your display of your UIAlertView.
- (void)buttonClicked:(UIButton *)sender
{
if (inEditMode)
{
// create your UIAlterView using [sender tag] to know which image you tapped on
}
}
Finally, you have two buttons on your UIAlertView, but you don't seem to check to see what button the user clicked on. Your view controller should be a UIAlterViewDelegate, in which you have defined your alertView:clickedButtonAtIndex which will do your actual edit steps.
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
// ok, will do what I need to do with whatever the user tapped in my alertview
}
The easiest thing I can think of off the top of my head is to have the gesture disabled by default, and then have the gesture enabled once the edit button is hit. This way, the picture will only respond to the tap gesture recognizer if it is in "Edit" mode.
I am implementing a sliding drawer on iOS5 (iPad). I have created the drawer by subclassing UIView. The drawer is added to the main view, which works fine. However, when I try to slide the drawer on/off screen using a swipe gesture and setFrame, the drawer does not move.
I believe I have implemented the gesture recognizer correctly, and the frame is also being set correctly. However, the drawer just does not move. Any thoughts on what I am doing wrong?
Below is my code:
The following method is called from viewDidLoad from my controller:
- (void)loadVerticalDrawer
{
NSLog(#"LoadVerticalDrawer Executed");
verticalDrawerHidden = YES;
if (verticalDrawerHidden) {
verticalDrawer = [[VerticalDrawer alloc] initWithFrame:CGRectMake(514, 250, 60, 248)];//adjust verticalDrawer height and width here;
} else {
verticalDrawer = [[VerticalDrawer alloc] initWithFrame:CGRectMake(464, 250, 60, 248)];//adjust verticalDrawer height and width here;
}
verticalDrawer.appsManager = appsManager;
verticalDrawer.delegate = self;
[self.view addSubview:verticalDrawer];
}
The following is also called from viewDidLoad:
rightDrawerLeftSwipe = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(rightDrawerHandleSwipeLeft:)] autorelease];
rightDrawerLeftSwipe.direction = UISwipeGestureRecognizerDirectionLeft;
rightDrawerLeftSwipe.numberOfTouchesRequired = 1;
rightDrawerLeftSwipe.delegate = self;
[verticalDrawer addGestureRecognizer:rightDrawerLeftSwipe];
rightDrawerRightSwipe = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(rightDrawerHandleSwipeRight:)] autorelease];
rightDrawerRightSwipe.direction = UISwipeGestureRecognizerDirectionRight;
rightDrawerRightSwipe.numberOfTouchesRequired = 1;
rightDrawerRightSwipe.delegate = self;
[verticalDrawer addGestureRecognizer:rightDrawerRightSwipe];
FInally, this is the handler for the Right Swipe:
-(void) rightDrawerHandleSwipeRight:(UISwipeGestureRecognizer*) recognizer
{
if (recognizer.state == UIGestureRecognizerStateEnded)
{
if (!verticalDrawerHidden){
verticalDrawerHidden = YES;
float x = verticalDrawer.frame.origin.x;
float y = verticalDrawer.frame.origin.y;
float width = verticalDrawer.frame.size.width;
float height = verticalDrawer.frame.size.height;
NSLog(#"Swipe left, Vertical drawer, x=%f, y=%f, width=%f, height=%f:", x,y,width,height);
x+=50;
[verticalDrawer setFrame:CGRectMake(x,y,width,height)];
NSLog(#"Swipe left, Vertical drawer, x=%f, y=%f, width=%f, height=%f:", x,y,width,height);
return;
}
else {
return;
}
}
}
Please note that the frame of verticalDrawer is being set correctly (and the swipe handler is being called as desired), as per the logs, its just that the view is not moving at all!!
I'm adding a custom clear button (UIButton) to a UITextField as the rightView, however I've found there's some weird behaviour on the viewMode. It doesn't seem to display as the normal clear button does, despite the view mode being set. Example code below:
UITextField *f = [[[UITextField alloc] init] autorelease];
f.frame = CGRectMake(0, 0, 300, 44);
f.backgroundColor = [UIColor clearColor];
f.textColor = [UIColor whiteColor];
f.clearButtonMode = UITextFieldViewModeNever;
UIImage *image = [UIImage imageNamed:#"Image.png"];
UIButton *b = [UIButton buttonWithType:UIButtonTypeCustom];
b.frame = CGRectMake(0, 0, image.size.width, image.size.height);
[b setImage:image forState:UIControlStateNormal];
f.rightView = b;
f.rightViewMode = UITextFieldViewModeWhileEditing;
The button displays correctly in the following states:
Shows while focused and no text
Shows while focused and typing
Hides when no focus
However, if the textfield already has content, and you switch focus to it the clear button does not show. To get it to show again you must delete all text, and switch focus back and forth.
I haven't found anyone else with this problem, so have been scratching my head on this one for a while. Any light shedding very much appreciated.
This fixes the bug :
- (BOOL)becomeFirstResponder
{
BOOL ret = YES ;
ret = [super becomeFirstResponder] ;
if( ret && ( _setupClearButtonMode == UITextFieldViewModeWhileEditing ) )
self.rightViewMode = UITextFieldViewModeAlways ;
return ret ;
}
- (BOOL)resignFirstResponder
{
BOOL ret = YES ;
ret = [super resignFirstResponder] ;
if( ret && ( _setupClearButtonMode == UITextFieldViewModeWhileEditing ) )
self.rightViewMode = UITextFieldViewModeWhileEditing ;
return ret ;
}
In your subclass of UITextField
with the var _setupClearButtonMode set on init.
I recently ran into the same problem and ended up setting right view mode to UITextFieldViewModeAlways and manually showing/hiding that button when it's needed (made proxy delegate which monitored text field state, set button's visibility and passed messages to actual delegate).
Simple code for solve this problem
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
textField.rightViewMode=UITextFieldViewModeAlways;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
textField.rightViewMode=UITextFieldViewModeNever;
return YES;
}
Is there an apple-house-made way to get a UISlider with a ProgressView. This is used by many streaming applications e.g. native quicktimeplayer or youtube.
(Just to be sure: i'm only in the visualization interested)
cheers Simon
Here's a simple version of what you're describing.
It is "simple" in the sense that I didn't bother trying to add the shading and other subtleties. But it's easy to construct and you can tweak it to draw in a more subtle way if you like. For example, you could make your own image and use it as the slider's thumb.
This is actually a UISlider subclass lying on top of a UIView subclass (MyTherm) that draws the thermometer, plus two UILabels that draw the numbers.
The UISlider subclass eliminates the built-in track, so that the thermometer behind it shows through. But the UISlider's thumb (knob) is still draggable in the normal way, and you can set it to a custom image, get the Value Changed event when the user drags it, and so on. Here is the code for the UISlider subclass that eliminates its own track:
- (CGRect)trackRectForBounds:(CGRect)bounds {
CGRect result = [super trackRectForBounds:bounds];
result.size.height = 0;
return result;
}
The thermometer is an instance of a custom UIView subclass, MyTherm. I instantiated it in the nib and unchecked its Opaque and gave it a background color of Clear Color. It has a value property so it knows how much to fill the thermometer. Here's its drawRect: code:
- (void)drawRect:(CGRect)rect {
CGContextRef c = UIGraphicsGetCurrentContext();
[[UIColor whiteColor] set];
CGFloat ins = 2.0;
CGRect r = CGRectInset(self.bounds, ins, ins);
CGFloat radius = r.size.height / 2.0;
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, CGRectGetMaxX(r) - radius, ins);
CGPathAddArc(path, NULL, radius+ins, radius+ins, radius, -M_PI/2.0, M_PI/2.0, true);
CGPathAddArc(path, NULL, CGRectGetMaxX(r) - radius, radius+ins, radius, M_PI/2.0, -M_PI/2.0, true);
CGPathCloseSubpath(path);
CGContextAddPath(c, path);
CGContextSetLineWidth(c, 2);
CGContextStrokePath(c);
CGContextAddPath(c, path);
CGContextClip(c);
CGContextFillRect(c, CGRectMake(r.origin.x, r.origin.y, r.size.width * self.value, r.size.height));
}
To change the thermometer value, change the MyTherm instance's value to a number between 0 and 1, and tell it to redraw itself with setNeedsDisplay.
This is doable using the standard controls.
In Interface Builder place your UISlider immediately on top of your UIProgressView and make them the same size.
On a UISlider the background horizontal line is called the track, the trick is to make it invisible. We do this with a transparent PNG and the UISlider methods setMinimumTrackImage:forState: and setMaximumTrackImage:forState:.
In the viewDidLoad method of your view controller add:
[self.slider setMinimumTrackImage:[UIImage imageNamed:#"transparent.png"] forState:UIControlStateNormal];
[self.slider setMaximumTrackImage:[UIImage imageNamed:#"transparent.png"] forState:UIControlStateNormal];
where self.slider refers to your UISlider.
I've tested the code in Xcode, and this will give you a slider with an independent progress bar.
Solution that suits my design:
class SliderBuffering:UISlider {
let bufferProgress = UIProgressView(progressViewStyle: .Default)
override init (frame : CGRect) {
super.init(frame : frame)
}
convenience init () {
self.init(frame:CGRect.zero)
setup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
}
func setup() {
self.minimumTrackTintColor = UIColor.clearColor()
self.maximumTrackTintColor = UIColor.clearColor()
bufferProgress.backgroundColor = UIColor.clearColor()
bufferProgress.userInteractionEnabled = false
bufferProgress.progress = 0.0
bufferProgress.progressTintColor = UIColor.lightGrayColor().colorWithAlphaComponent(0.5)
bufferProgress.trackTintColor = UIColor.blackColor().colorWithAlphaComponent(0.5)
self.addSubview(bufferProgress)
}
}
Create a UISlider:
// 1
// Make the slider as a public propriety so you can access it
playerSlider = [[UISlider alloc] init];
[playerSlider setContinuous:YES];
[playerSlider setHighlighted:YES];
// remove the slider filling default blue color
[playerSlider setMaximumTrackTintColor:[UIColor clearColor]];
[playerSlider setMinimumTrackTintColor:[UIColor clearColor]];
// Chose your frame
playerSlider.frame = CGRectMake(--- , -- , yourSliderWith , ----);
// 2
// create a UIView that u can access and make it the shadow of your slider
shadowSlider = [[UIView alloc] init];
shadowSlider.backgroundColor = [UIColor lightTextColor];
shadowSlider.frame = CGRectMake(playerSlider.frame.origin.x , playerSlider.frame.origin.y , playerSlider.frame.size.width , playerSlider.frame.origin.size.height);
shadowSlider.layer.cornerRadius = 4;
shadowSlider.layer.masksToBounds = YES;
[playerSlider addSubview:shadowSlider];
[playerSlider sendSubviewToBack:shadowSlider];
// 3
// Add a timer Update your slider and shadow slider programatically
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(updateSlider) userInfo:nil repeats:YES];
-(void)updateSlider {
// Update the slider about the music time
playerSlider.value = audioPlayer.currentTime; // based on ur case
playerSlider.maximumValue = audioPlayer.duration;
float smartWidth = 0.0;
smartWidth = (yourSliderFullWidth * audioPlayer.duration ) / 100;
shadowSlider.frame = CGRectMake( shadowSlider.frame.origin.x , shadowSlider.frame.origin.y , smartWidth , shadowSlider.frame.size.height);
}
Enjoy! P.S. I might have some typos.
Idea 1:
You could easily use the UISlider as a progress view by subclassing it. It responds to methods such as 'setValue:animated:' with which you can set the value (i.e: progress) of the view.
Your only 'restriction' creating what you see in your example is the buffer bar, which you could create by 'creatively' skinning the UISlider (because you can add custom skins to it), and perhaps set that skin programmatically.
Idea 2:
Another (easier) option is to subclass UIProgressView, and create a UISlider inside that subclass. You can skin the UISlider to have a see-through skin (no bar, just the knob visible) and lay it over the UIProgressView.
You can use the UIProgressView for the pre-loading (buffering) and the UISlider for movie control / progress indication.
Seems fairly easy :-)
Edit: to actually answer your question, there is no in-house way, but it would be easy to accomplish with the tools given.
You can do some trick like this, it's more easy and understanding. Just insert the code bellow in your UISlider subclass.
- (void)layoutSubviews
{
[super layoutSubviews];
if (_availableDurationImageView == nil) {
// step 1
// get max length that our "availableDurationImageView" will show
UIView *maxTrackView = [self.subviews objectAtIndex:self.subviews.count - 3];
UIImageView *maxTrackImageView = [maxTrackView.subviews objectAtIndex:0];
_maxLength = maxTrackImageView.width;
// step 2
// get the right frame where our "availableDurationImageView" will place in superView
UIView *minTrackView = [self.subviews objectAtIndex:self.subviews.count - 2];
_availableDurationImageView = [[UIImageView alloc] initWithImage:[[UIImage imageNamed:#"MediaSlider.bundle/4_jindu_huancun.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 2, 0, 2)]];
_availableDurationImageView.opaque = NO;
_availableDurationImageView.frame = minTrackView.frame;
[self insertSubview:_availableDurationImageView belowSubview:minTrackView];
}
}
- (void)setAvailableValue:(NSTimeInterval)availableValue
{
if (availableValue >=0 && availableValue <= 1) {
// use "maxLength" and percentage to set our "availableDurationImageView" 's length
_availableDurationImageView.width = _maxLength * availableValue;
}
}
Adding on matt's solution, note that as of iOS 7.0, implementing trackRectForBounds: is rendered impossible. Here is my solution to this problem :
In your UISlider subclass, do this :
-(void)awakeFromNib
{
[super awakeFromNib];
UIImage* clearColorImage = [UIImage imageWithColor:[UIColor clearColor]];
[self setMinimumTrackImage:clearColorImage forState:UIControlStateNormal];
[self setMaximumTrackImage:clearColorImage forState:UIControlStateNormal];
}
with imageWithColor as this function :
+ (UIImage*) imageWithColor:(UIColor*)color
{
return [UIImage imageWithColor:color andSize:CGSizeMake(1.0f, 1.0f)];
}
That will properly take care of this annoying trackRectangle.
I spent too much time looking for a solution to this problem, here's hoping that'll save some time to another poor soul ;).
Here is a solution in Objective C. https://github.com/abhimuralidharan/BufferSlider
The idea is to create a UIProgressview as a property in the UISlider subclass and add the required constraints programatically.
#import <UIKit/UIKit.h> //.h file
#interface BufferSlider : UISlider
#property(strong,nonatomic) UIProgressView *bufferProgress;
#end
#import "BufferSlider.h" //.m file
#implementation BufferSlider
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setup];
}
return self;
}
-(void)setup {
self.bufferProgress = [[UIProgressView alloc] initWithFrame:self.bounds];
self.minimumTrackTintColor = [UIColor redColor];
self.maximumTrackTintColor = [UIColor clearColor];
self.value = 0.2;
self.bufferProgress.backgroundColor = [UIColor clearColor];
self.bufferProgress.userInteractionEnabled = NO;
self.bufferProgress.progress = 0.7;
self.bufferProgress.progressTintColor = [[UIColor blueColor] colorWithAlphaComponent:0.5];
self.bufferProgress.trackTintColor = [[UIColor lightGrayColor] colorWithAlphaComponent:2];
[self addSubview:self.bufferProgress];
[self setThumbImage:[UIImage imageNamed:#"redThumb"] forState:UIControlStateNormal];
self.bufferProgress.translatesAutoresizingMaskIntoConstraints = NO;
NSLayoutConstraint *left = [NSLayoutConstraint constraintWithItem:self.bufferProgress attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:0];
NSLayoutConstraint *centerY = [NSLayoutConstraint constraintWithItem:self.bufferProgress attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0.75]; // edit the constant value based on the thumb image
NSLayoutConstraint *right = [NSLayoutConstraint constraintWithItem:self.bufferProgress attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTrailing multiplier:1 constant:0];
[self addConstraints:#[left,right,centerY]];
[self sendSubviewToBack:self.bufferProgress];
}
- (instancetype)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
[self setup];
}
return self;
}
#end
for Swift5
First, add tap gesture to slider:
let tap_gesture = UITapGestureRecognizer(target: self, action: #selector(self.sliderTapped(gestureRecognizer:)))
self.slider.addGestureRecognizer(tap_gesture)
Then, implement this function:
#objc func sliderTapped(gestureRecognizer: UIGestureRecognizer) {
let locationOnSlider = gestureRecognizer.location(in: self.slider)
let maxWidth = self.slider.frame.size.width
let touchLocationRatio = locationOnSlider.x * CGFloat(self.slider.maximumValue) / CGFloat(maxWidth)
self.slider.value = Float(touchLocationRatio)
print("New value: ", round(self.slider.value))
}