I've created a UIScrollView with paging containing several images, with 1 image per "page", and i was wondering if there were any way to distinguish the images from each other?
Fx. when the first image is showing, I would have a button to set a UILabel to '1' and when the second image is showing, the same button would set the same UILabel to '2'.
Here's my code:
pictures = [NSArray arrayWithObjects: [UIImage imageNamed:#"AND.png"], [UIImage imageNamed:#"ALB.png"], nil];
for (int i = 0; i < pictures.count; i++) {
CGRect frame;
frame.origin.x = 135 + (self.scrollViewQuiz.frame.size.width * i);
frame.origin.y = 40;
frame.size = CGSizeMake(50, 50);
UIImageView *subview = [[UIImageView alloc] initWithFrame:frame];
subview.image = [pictures objectAtIndex:i];
[self.scrollViewQuiz addSubview:subview];
}
self.scrollViewQuiz.contentSize = CGSizeMake(self.scrollViewQuiz.frame.size.width * pictures.count, self.scrollViewQuiz.frame.size.height);
It sounds like you just want to compute the "page number" that the scroll view is currently displaying. You can try something like this as your button's action:
- (IBAction)buttonWasTapped:(id)sender {
UIScrollView *scrollView = self.scrollViewQuiz;
int pageNumber = (int)roundf(scrollView.contentOffset.x / scrollView.bounds.size.width);
self.label.text = [NSString stringWithFormat:#"%d", pageNumber];
}
You could implement the following scrollview delegate method:
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
In it you would examine the scrollview's contentOffset and set the label accordingly.
Try these two.. these should work.. hope this helps..
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat xOffset = scrollView.contentOffset.x;
int currentPage = floor(xOffset / scrollView.bounds.size.width);
[itsLabel setText:[NSString stringWithFormat:#"%i", currentPage]];
}
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
CGFloat xOffset = scrollView.contentOffset.x;
int currentPage = floor(xOffset / scrollView.bounds.size.width);
[itsLabel setText:[NSString stringWithFormat:#"%i", currentPage]];
}
Related
I create Thumbnail photo with scrollview for ipad, here is the code:
// load all the images from bundle and add them to the scroll view
NSUInteger i;
for (i = 1; i <= kNumImages; i++)
{
NSString *imageName = [NSString stringWithFormat:#"image%d.jpg", i];
UIImage *image = [UIImage imageNamed:imageName];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
}
- (void)layoutScrollImages
{
UIImageView *view = nil;
NSArray *subviews = [scrollView1 subviews];
// reposition all image subviews in a horizontal serial fashion
CGFloat curXLoc = 0;
for (view in subviews)
{
if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
{
CGRect frame = view.frame;
frame.origin = CGPointMake(curXLoc, 0);
view.frame = frame;
curXLoc += (kScrollObjWidth);
}
}
}
rightnow I have all images in UIScrollView that they are next to each other, I want to have some space between each images like this picture
would you please give me some hint that how can I add space between these images?
Thanks in Advance!
Try this:
curXLoc += (kScrollObjWidth) + kDifferenceBetweenImages;
and define kDifferenceBeteweenIMages accordingly.
Use UICollectionView instead. Much easier to achieve what you want and will work better too.
It even has a property for the space between each cell.
Try this one :
CGRect frame = view.frame;
frame.origin = CGPointMake(curXLoc, 0);
frame.size.height = //put height;
frame.size.width = //put width;
frame.origin.y = //put y;
view.frame = frame;
curXLoc += (kScrollObjWidth) + 15;
I am using this code to show scrolling images but I am only getting a white screen. I drag drop uiscrollview, created the iboutlet, synthesized it and rest of the code is here
#synthesize scrollView1;
const CGFloat kScrollObjHeight = 199.0;
const CGFloat kScrollObjWidth = 280.0;
const NSUInteger kNumImages = 5;
- (void)layoutScrollImages
{
UIImageView *view = nil;
NSArray *subviews = [scrollView1 subviews];
// reposition all image subviews in a horizontal serial fashion
CGFloat curXLoc = 0;
for (view in subviews)
{
if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
{
CGRect frame = view.frame;
frame.origin = CGPointMake(curXLoc, 0);
view.frame = frame;
curXLoc += (kScrollObjWidth);
}
}
// set the content size so it can be scrollable
[scrollView1 setContentSize:CGSizeMake((kNumImages * kScrollObjWidth), [scrollView1 bounds].size.height)];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
scrollView1 = [[UIScrollView alloc]init];
bgArray = [NSArray arrayWithObjects:#"Bg", #"Bg1.png", #"Bg2.png", #"Bg3.png", #"Bg4.png", #"Bg5.png", #"Bg6.png", #"Bg7.png", #"Bg8.png", nil];
[scrollView1 setBackgroundColor:[UIColor blackColor]];
[scrollView1 setCanCancelContentTouches:NO];
scrollView1.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView1.clipsToBounds = YES; // default is NO, we want to restrict drawing within our scrollview
scrollView1.scrollEnabled = YES;
// pagingEnabled property default is NO, if set the scroller will stop or snap at each photo
// if you want free-flowing scroll, don't set this property.
scrollView1.pagingEnabled = YES;
// load all the images from our bundle and add them to the scroll view
NSUInteger i;
for (i = 0; i < [bgArray count]; i++)
{
NSString *imageName = [NSString stringWithFormat:#"%#", [bgArray objectAtIndex:i]];
UIImage *image = [UIImage imageNamed:imageName];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
// setup each frame to a default height and width, it will be properly placed when we call "updateScrollList"
CGRect rect = imageView.frame;
rect.size.height = 199.0;
rect.size.width = 280.0;
imageView.frame = rect;
imageView.tag = i; // tag our images for later use when we place them in serial fashion
[scrollView1 addSubview:imageView];
[scrollView1 setShowsHorizontalScrollIndicator:NO];
[scrollView1 setShowsVerticalScrollIndicator:NO];
}
[self layoutScrollImages];
}
I think if you are create UIScrollView from code
scrollView1 = [[UIScrollView alloc]init];
then please add the scrollView1 in view
Example:-[self.view addSubview:scrollView1];
if you are create UIScrollView from nib then
not use this code
scrollView1 = [[UIScrollView alloc]init];
solve your probem
I tried to implement paging with 2 views from this tutorial:
Multiple virtual pages in a UIScrollView with just 2 child views
I wanted to modify this by putting UIScrollView to pages and in every page updating it with new content:
-(void)addContent:(NSString*)txt{
int size = 5;
UITextView *txtView;
int row = 0;
//from left
int xPlace = 0;
//space between row's
int rowSpace = 20;
//from top
int yPlace = 10;
// int button_with = scrollView.frame.size.width;
int button_height = 20;
for (int i = 0; i < size; i++) {
txtView = [[UITextView alloc] initWithFrame:CGRectMake(xPlace, row*rowSpace+yPlace, scrollView.frame.size.width, 2*button_height)];
[txtView setFont:[UIFont fontWithName:#"ArialMT" size:14]];
txtView.backgroundColor = [UIColor blueColor];
[txtView setText:[NSString stringWithFormat:#"Numer %# - %i",txt,i]];
// answerCheck.titleLabel.font = [UIFont boldSystemFontOfSize:fontSize];
[scrollView addSubview:txtView];
[txtView release];
row++;
}
[scrollView setContentSize:CGSizeMake(scrollView.frame.size.width, txtView.frame.size.height*size)];
}
The idea is when scrolling just replace uiviewcontroller with new content. It calls:
- (void)setPageIndex:(NSInteger)newPageIndex
{
pageIndex = newPageIndex;
if (pageIndex >= 0 && pageIndex < [[DataSource sharedDataSource] numDataPages])
{
NSDictionary *pageData =
[[DataSource sharedDataSource] dataForPage:pageIndex];
label.text = #"Tekstas";//[pageData objectForKey:#"pageName"];
textView.text = [pageData objectForKey:#"pageText"];
[self addContent:[pageData objectForKey:#"pageText"]];
CGRect absoluteRect = [self.view.window
convertRect:textView.bounds
fromView:textView];
if (!self.view.window ||
!CGRectIntersectsRect(
CGRectInset(absoluteRect, TEXT_VIEW_PADDING, TEXT_VIEW_PADDING),
[self.view.window bounds]))
{
textViewNeedsUpdate = YES;
}
}
}
Well here I stuck. My text view is updating but new content of UIscrollView don't update in iPad simulator.
Yea I mean in iphone it works while in iPad it don't. What I could improve if I want to achieve this functionality?
Maybe there are other way to do paging from iOS 5?
I would put source that a tried to make working.
Download source
You can just use a nib file add a UIScrollView with fix width and height. Now make some pages as a UIView and add them to UIScrollView with same size and same origin. In the main UIView:
- (void)viewDidLoad
{
[super viewDidLoad];
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, scrollView.frame.size.height * 2);
}
-(void)viewWillAppear:(BOOL)animated{
CGFloat h = scrollView.frame.size.height;
[pageView1 setFrame:CGRectMake(0, 0, pageView1.frame.size.width, pageView1.frame.size.height)];
[pageView2 setFrame:CGRectMake(0, h, pageView2.frame.size.width, pageView2.frame.size.height)];
}
And don't forget to check Paging Enabled for UIScrollView in the Attributes in the nib file.
I hope be useful for you!
This is my code for adding sound while UIScrollview is scrolling in iPhone SDK. In this code, how to add the sound while using touch-events in scrolling?
Please give me your idea and suggestion or sample.
const CGFloat kScrollObjHeight = 151.0;
const CGFloat kScrollObjWidth =320.0;
const NSUInteger kNumImages = 5;
- (void)layoutScrollImages
{
UIImageView *view = nil;
NSArray *subviews = [scrollView1 subviews];
CGFloat curXLoc = 0;
for (view in subviews)
{
if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
{
CGRect frame = view.frame;
frame.origin = CGPointMake(curXLoc, 0);
view.frame = frame;
curXLoc += (kScrollObjWidth);
}
}
[scrollView1 setContentSize:CGSizeMake((kNumImages * kScrollObjWidth), [scrollView1 bounds].size.height)];
}
- (void)viewDidLoad
{
self.view.backgroundColor = [UIColor clearColor];
[scrollView1 setBackgroundColor:[UIColor whiteColor]];
[scrollView1 setCanCancelContentTouches:NO];
scrollView1.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView1.clipsToBounds = YES;
scrollView1.scrollEnabled = YES;
scrollView1.pagingEnabled = YES;
NSUInteger i;
for (i = 1; i <= kNumImages; i++)
{
NSString *imageName = [NSString stringWithFormat:#"snap%d.jpg", i];
UIImage *image = [UIImage imageNamed:imageName];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
CGRect rect = imageView.frame;
rect.size.height = kScrollObjHeight;
rect.size.width = kScrollObjWidth;
imageView.frame = rect;
imageView.tag = i;
[scrollView1 addSubview:imageView];
[imageView release];
[self layoutScrollImages];
}
[super viewDidLoad];
}
add UIScrollViewDelegate to your interface and then play sound while the scrolling is in task in scrollViewWillBeginDragging state and stop scrolling while in scrollViewDidEndDragging state.
You can use AVAudioPlayer to play sound on iOS devices
UPDATE:
Tells the delegate when the scroll view is about to start scrolling the content.
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
Also, Tells the delegate when dragging ended in the scroll view.
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
Implement these in your code & put in your custom behavior
you mast use UIScrollViewDelegate method
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
//play sound here
}
I have a scroll view that contains image view sized 68x78:
As you could see, all that images except from the centered one have a shadow. It changes when user scrolls, center image is always clear. It goes perfect until for the left edge image:
Here is the code:
-(void) buildSlideView{
fotosJugadores = [[NSArray alloc] initWithObjects:#"cara5.png", #"cara7.png", #"cara8.png", #"cara9.png", #"cara11.png", #"cara13.png", #"cara14.png", #"cara15.png", #"cara18.png",#"cara19.png", #"cara20.png", #"cara32.png",#"cara44.png",#"cara51.png", #"cara100.png", #"cara101.png", #"cara102.png",#"cara103.png", #"cara104.png", #"cara105.png",#"cara106.png",#"cara107.png", nil];
numberOfViews = [fotosJugadores count];
for (int i = 0; i < [fotosJugadores count]; i++) {
UIImage *myImage = [UIImage imageNamed:[fotosJugadores objectAtIndex:i]];
CGFloat yOrigin = i * (myImage.size.width+3) + 120;
UIImageView *awesomeView = [[UIImageView alloc] initWithFrame:CGRectMake(yOrigin, 0, myImage.size.width, myImage.size.height)];
awesomeView.tag = i;
awesomeView.image = myImage;
awesomeView.alpha = 0.5f;
awesomeView.backgroundColor = [UIColor blackColor];
[self.jugadorSlide addSubview:awesomeView];
awesomeView=nil;
}
[jugadorSlide setBackgroundColor:[UIColor blackColor]];
jugadorSlide.contentSize = CGSizeMake(68 * numberOfViews+240,78);
jugadorSlide.layer.cornerRadius = 11;
jugadorSlide.layer.masksToBounds = YES;
[jugadorSlide setContentOffset:CGPointMake(((68 * numberOfViews)/2), 0)];
//jugadorSlide.decelerationRate = UIScrollViewDecelerationRateNormal;
[self scrollViewDidEndDragging:jugadorSlide willDecelerate:NO];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
currentIndex = roundf(scrollView.contentOffset.x / 68);
NSLog(#"current end %d", currentIndex);
UIImageView *currentImage = [scrollView viewWithTag:currentIndex];
if (currentIndex>0&¤tIndex<=21){
if (currentIndex==currentImage.tag){
currentImage.alpha=1.0f;
[self changePerfilImage:currentImage.tag];}
CGPoint pointZero= CGPointMake(scrollView.contentOffset.x, currentImage.frame.origin.y);
[jugadorSlide setContentOffset:pointZero animated:YES];
}else {
UIImageView *currentImage = [scrollView viewWithTag:0];
NSLog(#"end dragging image tag %d", currentImage.tag);
currentImage.alpha=1.0f;
[self changePerfilImage:currentImage.tag];}
CGPoint pointZero= CGPointMake(currentImage.frame.origin.x+15, 0);
//[jugadorSlide setContentOffset:pointZero animated:YES];
}
As you can see, in the scrollViewDidEndDragging: "else" , I forced the tag as a desesperate solution, but images doesn't get clear.
You are incrementing the tag twice...
awesomeView.tag = i++;
Should just be:
awesomeView.tag = i+1;
I use i+1 because I never use a tag of 0 since any subview that hasn't been assigned a tag will have a tag of 0.
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
NSInteger currentIndex = roundf(scrollView.contentOffset.x / 68.0) + 1;
UIImageView *currentImage = [scrollView viewWithTag:currentIndex];
...
}
If this doesn't work you should NSLog the currentIndex each time you land on a new image and see what is happening when you land on the first one.