This site really is awesome.
I have what is hopefully a simple question this time. I would like to pass any scrolling input from the user (could be wheel, touchpad, etc) to an NSScrollView which contains my own subviews.
At the moment if the user scrolls just on the documentView (outside of my subviews' frames) the scroll works normally but if they scroll while the cursor is over a subview nothing happens. So basically I'd like to have the subview recognise the scroll event and pass it back to the scroll view.
Any help is greatly appreciated.
Cheers.
EDIT:
Here is the code I'm using to add the subviews to the documentView
_milestoneView and _activityView are both NSView subclasses which have a corresponding nib (created with instantiateNibWithOwner and objects hooked up accordingly) they contain a NSTextField, PXListView and some have a NSProgressIndicator.
-(void)useProject:(NSNumber *)projectId
{
[self resetView];
NSRect bounds = [[self view] bounds];
NSRect defaultFrame = NSMakeRect(20, NSMaxY(bounds)-93, NSMaxX(bounds)-20, 50);
//Prepare the milestone view
if (_milestoneView == nil)
_milestoneView = [MilestoneView milestoneViewFromNibWithFrame:defaultFrame withProject:[BCLocalFetch projectForId:projectId]];
[_milestoneView reloadList];
//Prepare the activity view
if (_activityView == nil)
_activityView = [ActivityView activityViewFromNibWithFrame:defaultFrame withProject:[BCLocalFetch projectForId:projectId]];
[self refresh];
}
I then use the refresh method to reposition them as the content sizes vary so I wanted to have a separate method.
-(void)refresh
{
//Position the milestones first
[_milestoneView setFrameOrigin:NSMakePoint(20, NSMaxY([[self view] bounds])-[_milestoneView frame].size.height-60)];
if ([[_milestoneView milestones] count] > 0)
[[self view] addSubview:_milestoneView];
//Now the activity view
[_activityView setFrameOrigin:NSMakePoint(20, [_milestoneView frame].origin.y-[_activityView frame].size.height-20)];
[[self view] addSubview:_activityView];
[self autosizeView];
}
-(void)autosizeView
{
//Resize the view to accommodate all subviews
NSRect oldFrame = [[self view] frame];
CGFloat lastY = [_activityView frame].origin.y;
if (lastY < 0) {
CGFloat newHeight = oldFrame.size.height + (-lastY);
[[self view] setFrameSize:NSMakeSize(oldFrame.size.width, newHeight)];
}
[[NSNotificationCenter defaultCenter] postNotificationName:#"BBContentDidResizeNotification" object:self];
}
Ok so I came back to the issue and finally got it worked out. The implementation was actually quite simple.
I added a property to PXListView to point to the NSScrollView that is to be scrolled.
I then implemented NSResponder's scrollWheel: method like this:
-(void)scrollWheel:(NSEvent *)theEvent
{
//Pass scrolling to the superview
[_scrollHandler scrollWheel:theEvent];
}
And all is well!
Related
What I have:
Basically I have collection of UIViews presented in horizontal scrollView. UIScrollView have paging enabled and each item is not full screen so I can see part of previous and next view based on this.
Each view have delete button on itself.
What I need:
I need to find good idea to animate reloading UIScrollView content after removing one of the subview. As I thought about it there will be 4 different kinds of deletion:
1. deletion of last view
2. deletion of first view
3. deletion of middle view - hardest one
4. deletion of only view - easiest one, just animation of view disappearing
I need some suggestions/solutions.
Thanks,
Michal
edit:
Ok, I havent implemented it fully.
Here is reload method:
- (void)loadScrollView{
for(UIView* view in [_scrollView subviews])
{
[view removeFromSuperview];
}
CGRect frame = self.scrollView.frame;
frame.origin.x = 0;
frame.origin.y = 0;
int i = 0;
_scrollView.clipsToBounds = NO;
_scrollView.pagingEnabled = YES;
_scrollView.showsHorizontalScrollIndicator = NO;
for(MPContact* contact in self.items)
{
frame.origin.x = self.scrollView.frame.size.width*i;
MyView *view = [[[NSBundle mainBundle] loadNibNamed:#"MyView" owner:self options:nil] objectAtIndex:0];
[view setFrame:frame];
i++;
[view.nameAndSurnameLabel setText:#"view text"];
[view setDelegate:self];
[self.scrollView addSubview:view];[self.viewsArray addObject:view];
}[self.scrollView setContentSize:CGSizeMake(frame.size.width*[self.items count], frame.size.height)];}
Each MyView have delete button with delegate, delegate removes view from viewsArray and run this method for now.
I suggest you to use + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion method of UIView class. Just get your UIView that you want to delete, from UIScrollView and set view.alpha = 0 in animations block. In completion block remove this UIView from UIScrollView, using removeFromSuperView method. Setting alpha to 0 will make fade animation.
EDIT:
Iterate all your views you want to move and change it's x coordinate.
for(UIView *view in scrollview.subviews)
{
[UIView animateWithDuration:0.1 animations:^{
[view setFrame:CGRectMake(view.x-(/*HERE YOU NEED TO PUT WIDTH OF TOUR DELETING VIEW*/),view.y,view.width,view.heigh)];
}
completion:^(BOOL finished){
//remove view from superview and change your uiscrollview's content offset.
}];
}
In the app I am working on, my goal right now is to scroll content when the keyboard shows and to allow users to scroll while it is showing. I have tried a few different solutions and none have been able to achieve this yet.
I'm using storyboards in the app and here is the element hierarchy within the view controller:
View Controller
UIScrollView
UIView
Buttons/textfields/labels/UIPickerView
I first set the UIScrollView's content size to be the same size of the view that was inside of it holding all of the form elements. When that didn't work, I tried over-exagerating the height of the content manually setting the content size to be 320 x 2000. Again, that didn't work. I have user interaction enabled set to YES on the scroll view as well. This is the code I have in there at this point.
CGSize contentSize = CGSizeMake(320, 2000);
[self.scrollView setContentSize:contentSize];
Within the scroll view I had a button that sits behind the whole form that has an action to close the keyboard if a user touches outside of it. I disabled that to see if it may have been a conflict in events that would keep it from scrolling. Again, didn't work.
-(IBAction)closeKeyboard:(id)sender
{
if(![self isFirstResponder]){
[self.view endEditing:YES];
}
}
I even set up some observers to see if the keyboard is about to appear or disappear. The observers would adjust the height of the scroll view, not the content size, just the scroll view itself, based on where the keyboard was currently sitting. So at this point, the content in the scroll view would be much taller than the scroll view itself, but still no scrolling is happening.
Here is the code for my observers:
// adjust view based on keyboard
- (void)keyboardWillHide:(NSNotification *)n
{
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
// resize the scrollview
CGRect viewFrame = self.view.frame;
// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.
//viewFrame.size.height += keyboardSize.height;
CGRect scrollRect = CGRectMake(viewFrame.origin.x, viewFrame.origin.y, viewFrame.size.width, viewFrame.size.height + keyboardSize.height + 100);
[UIScrollView beginAnimations:nil context:NULL];
[UIScrollView setAnimationBeginsFromCurrentState:YES];
[UIScrollView setAnimationDuration:0.3];
[self.scrollView setFrame:scrollRect];
self.scrollView.userInteractionEnabled = YES;
[UIScrollView commitAnimations];
keyboardShowing = false;
}
- (void)keyboardWillShow:(NSNotification *)n
{
// This is an ivar I'm using to ensure that we do not do the frame size adjustment on the UIScrollView if the keyboard is already shown. This can happen if the user, after fixing editing a UITextField, scrolls the resized UIScrollView to another UITextField and attempts to edit the next UITextField. If we were to resize the UIScrollView again, it would be disastrous. NOTE: The keyboard notification will fire even when the keyboard is already shown.
if (keyboardShowing) {
return;
}
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
// resize the noteView
CGRect viewFrame = self.view.frame;
// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.
CGRect scrollRect = CGRectMake(viewFrame.origin.x, viewFrame.origin.y, viewFrame.size.width, viewFrame.size.height - keyboardSize.height - 100);
//scrollView.frame.size.height -= keyboardSize.height;
//viewFrame.size.height -= keyboardSize.height;
[UIScrollView beginAnimations:nil context:NULL];
[UIScrollView setAnimationBeginsFromCurrentState:YES];
[UIScrollView setAnimationDuration:0.3];
[self.scrollView setFrame:scrollRect];
self.scrollView.userInteractionEnabled = YES;
[UIScrollView commitAnimations];
keyboardShowing = YES;
}
I would not be surprised if this is one of those simple mistakes that keeps slipping my mind, but this sort of accessibility feature would be really nice to have in the app. Any help would be much appreciated, or even other possible solutions to the problem I am trying to solve would be great too.
It looks like you're using a gesture recognizer in IB to detect a tap outside event. Because this recognizer is in the highest view in the hierarchy, it overrides the scrollview's detectors. You might need to change it slightly depending on which areas you want to be able to tap on to close the keyboard.
This is the UIResponder class reference. It lists all of the UIResponder events that your view controller automatically inherits. What might fix your problem is subclassing your UIScrollView and adding the keyboard closing code to it. Also, make sure that you set it to the first responder.
Final code that worked:
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ([touch tapcount] == 1)
for(UIView *view in self.view.subviews){
if([view isKindOfClass:[UITextField class]]){
[view resignFirstResponder];
}
}
}
}
I want to add functionality to my back buttons through my UINavigationController-based app where long-pressing the back button will pop to root. However, I can't figure out where to attach the gesture recognizer. Do I subclass UINavigationBar and try and detect if the long press is in the left button region?
I've heard of people adding similar functionality before. Anyone have any ideas?
I know this question is old, but I came up with a solution. Instead of trying to add the gesture recognizer to the button itself (which would be ideal), I added it to the self.navigationController.navigationBar and then in the action method, use the locationInView to see if I'm over the back button. I wasn't entirely sure about how to identify the back button precisely, so I'm clumsily just grabbing the the first subview with an x coordinate less than some arbitrary value, but it seems promising. If someone has a better way to identify the frame of the back button, let me know.
- (void)longPress:(UILongPressGestureRecognizer *)sender
{
if (sender.state == UIGestureRecognizerStateEnded)
{
// set a default rectangle in case we don't find the back button for some reason
CGRect rect = CGRectMake(0, 0, 100, 40);
// iterate through the subviews looking for something that looks like it might be the right location to be the back button
for (UIView *subview in self.navigationController.navigationBar.subviews)
{
if (subview.frame.origin.x < 30)
{
rect = subview.frame;
break;
}
}
// ok, let's get the point of the long press
CGPoint longPressPoint = [sender locationInView:self.navigationController.navigationBar];
// if the long press point in the rectangle then do whatever
if (CGRectContainsPoint(rect, longPressPoint))
[self doWhatever];
}
}
- (void)addLongPressGesture
{
if (NSClassFromString(#"UILongPressGestureRecognizer"))
{
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longPress:)];
[self.navigationController.navigationBar addGestureRecognizer:longPress];
[longPress release];
}
}
I believe UIGestureRecognizers can only be added to UIViews and subclasses of UIViews.
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIView_Class/UIView/UIView.html
The back button is a UIBarButtonItem that descends from NSObject. Therefore, you won't be able to attach a gesture recognizer to a standard back button using
UILongPressGestureRecognizer *longPressGesture =
[[[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(longPress:)] autorelease];
[self.navigationItem.backBarButtonItem addGestureRecognizer:longPressGesture];
You can however add a custom view to a UIBarButtonItem. A custom view could just as easily be a UIView, UIButton, UILabel, etc.
Example:
UIView *myTransparentGestureView = [[UIView alloc] initWithFrame:CGRectMake(0,0,40,30)];
[myTransparentGestureView addGestureRecognizer:longPressGesture];
[self.navigationItem.backBarButtonItem setCustomView:myTransparentGestureView];
// Or you could set it like this
// self.navigationItem.backBarButtonItem.customView = myTransparentGestureView;
[myTransparentGestureView release];
You have to be careful however, since setting properties on backBarButtonItem applies to the next view that you push. So if you have view A that pushes to view B and you want the gesture to be recognized when you tap back in view B. You must set it up in view A.
I followed a slightly different path, figured I'd share it. The above answers are fine, but really, if the long press is in the leading 1/3 of the nav bar, that's good enough for me:
- (void)longPress:(UILongPressGestureRecognizer *)gr
{
NSLog(#"longPress:");
UINavigationBar *navBar = [self navigationBar];
CGFloat height = navBar.bounds.size.height;
CGPoint pt = [gr locationOfTouch:0 inView:navBar];
//NSLog(#"PT=%# height=%f", NSStringFromCGPoint(pt), height);
if(CGRectContainsPoint(CGRectMake(0,0,100,height), pt)) {
[self popToViewController:self.viewControllers[0] animated:YES];
}
}
Here's my solution:
In appDelegate (the "owner" of the nav bar in my app), In applicationDidFinishLaunchingWithOptions:
Get the nav bar view and add the gesture recognizer to the whole view:
// Get the nav bar view
UINavigationBar *myNavBar = nil;
for (UIView *view in [self.window.rootViewController.view subviews]) {
if ([view isKindOfClass:[UINavigationBar class]]) {
NSLog(#"Found Nav Bar!!!");
myNavBar = (UINavigationBar *)view;
}
}
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self
action:#selector(backButtonLongPress:)];
[myNavBar addGestureRecognizer:longPress];
NSLog(#"Gesture Recognizer Added.");
Then in appDelegate, in -(void) backButtonLongPress:(id) sender
Check to see if the gesture occurs within the frame of the back button:
if ([sender state] == UIGestureRecognizerStateBegan) {
// Get the nav bar view
UINavigationBar *myNavBar = nil;
for (UIView *view in [self.window.rootViewController.view subviews]) {
if ([view isKindOfClass:[UINavigationBar class]]) {
NSLog(#"Found Nav Bar!!!");
myNavBar = (UINavigationBar *)view;
}
}
// Get the back button view
UIView *backButtonView = nil;
for (UIView *view in [myNavBar subviews]) {
if ([[[view class] description] isEqualToString:#"UINavigationItemButtonView"]) {
backButtonView = view;
NSLog(#"Found It: %#", backButtonView);
NSLog(#"Back Button View Frame: %f, %f; %f, %f", backButtonView.frame.origin.x, backButtonView.frame.origin.y, backButtonView.frame.size.width, backButtonView.frame.size.height);
}
}
CGPoint longPressPoint = [sender locationInView:myNavBar];
NSLog(#"Touch is in back button: %#", CGRectContainsPoint(backButtonView.frame, longPressPoint) ? #"YES" : #"NO");
if (CGRectContainsPoint(backButtonView.frame, longPressPoint)) {
// Place your action here
}
// Do nothing if outside the back button frame
}
I am having a weird issue. I have a split view controller and in the detail view I have a scroll view. Inside the scroll view I have a lavel with some information.
When the application first opens in landscape, the scroll view is always placed 1/2 way down the view of the detail view. When I touch an item in the root view and the next view shows, then I return to the scroll view, the scroll view is in the correct place (10,10).
I have set the frame of the scroll view in the viewWillAppear method of the detail view. Here is my code:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if (([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait) ||
([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortraitUpsideDown)) {
[self setPortrait];
CGRect tmpR = [self.view frame];
NSLog(#"The Detail View Controller Portrait view: width: %f height: %f",tmpR.size.width, tmpR.size.height);
} else {
[self setLandscape];
CGRect tmpR = [self.view frame];
NSLog(#"The Detail View Controller Portrait view: width: %f height: %f",tmpR.size.width, tmpR.size.height);
}
// show the front page message....
[self setMessage:kDetailViewMessage];
// make sure the scroll is at the top....
[scrollView setContentOffset:CGPointMake(0, 0)];
}
-(void)setLandscape {
// set the proper scroll view size...
CGRect navigationBarFrame = self.navigationController.navigationBar.frame;
CGRect detailWindowFrame = splitView.detailViewController.view.frame;
CGRect sframe = CGRectZero;
sframe.origin = CGPointMake(10, 10 + navigationBarFrame.size.height);
sframe.size = CGSizeMake(detailWindowFrame.size.width - 20, detailWindowFrame.size.height - 20);
[self.scrollView setFrame:sframe];
[detailDescriptionLabel setFrame:CGRectMake(0, 0, sframe.size.width, sframe.size.height)];
[detailDescriptionLabel sizeToFit];
}
Right now the application will only display in landscape and the setPortrait function is not called.
This has been driving me crazy for a few hours now..... Any ideas?
I think you need to set the bounds origin of the content view, not the frame. (That's how it works for NSScrollView, anyway.)
I've created an NSScrollView which itself contains a NSClippedView as content view (this is all default, created by IB). Inside the contents view there is the (default) document view.
This NSScrollView has horizontal scroller disabled and vertical enabled and, most importantly auto hide scrollers enabled.
When I add new views (via code, runtime) to the document view the scroller does not unhide automatically, until the moment I vertically resize the window (and which in turn resizes the scrollview as well). 1px is enough. Just the new painting of the window seems enough.
What I am looking for is triggering this by code: so when I add views to the scrollviews' content view I would like the scrollbar to appear.
int numberOfChildViews = 10; //hard coded for example here
int childViewHeight = 80; //same as above
NSRect rect = NSMakeRect(0, 0, [[self.scrollView contentView] bounds].size.width, [numberOfChildViews*childViewHeight);
[[self.scrollView documentView] setFrame:rect];
[[self.scrollView documentView] setBounds:rect]; //just added to make sure
Then I added the custom views to the document view, like:
for (int i=0; i<numberOfChildViews; i++) {
NZBProgressViewController *item = [nzbProgressArray objectAtIndex:i];
int y=i*[[item view] bounds].size.height;
rect= NSMakeRect(0, y, [[scrollView contentView] frame].size.width, [[item view] bounds].size.height);
[[item view] setFrame:rect];
currentPosition++;
}
I am using a FlippedView so the origin will be displayed in left-top, like so:
#interface NSFlippedClipView : NSClipView {
}
#implementation NSFlippedClipView
- (BOOL)isFlipped {
return YES;
}
- (BOOL)isOpaque {
return YES;
}
#end
And added the following code to the awakeFromNib
NSFlippedClipView *documentView = [[NSFlippedClipView alloc] init];
[documentView setAutoresizingMask:NSViewWidthSizable];
[documentView setBackgroundColor:[self.scrollView backgroundColor]];
[self.scrollView setDocumentView:documentView];
[documentView release];
The scrollbars should become visible as soon as the document view is resized to be larger than the current viewport of the scroll view. Are you resizing the document view when you add your subviews to it?
Ahh, it's my own bad. For future reference: if you want to move the origin (0,0) to left-top use a NSView instead of NSClippedView extended class with IsFlipped method overriden to YES.
Thanks irsk for answering.