I feel like I have touched on every single possible cause for stopping this, but I have a UIScrollView in my Storyboard hooked up with an outlet and in the viewDidLoad I set the contentSize so that I can scroll (yes bigger than my frame size)!
However, whatever I change, I just can't scroll! I have a couple of textfields in my scrollview and bouncing enabled so I can see that when testing its moves up and down with my subviews in it but whatever I set the contentSize to I just can't scroll.
Anything I might be missing/should check? Is this a known issue with UIScrollView being used in a storyboard?
Whats even stranger is, I can do something like this:
[scrollView setBackgroundColor:[UIColor blueColor]]; and I have a blue scroll view! But setting content size fails.
Edit
My only code (otherwise scrollview is just dropped into storyboard view controller):
-(void)viewDidAppear:(BOOL)animated
{
[scrollView setContentSize:CGSizeMake(320, 640)];
}
Logged frame, comes out as expected:
width: 320.00
height: 504.00
Edit 2
Turns out that removing any subviews of the scroll view in my storyboard lets it scroll just fine. If I add any subview to it at all via the storyboard, even a blank brand new UIButton it just won't apply the contentSize/allow scrolling.
use ViewDidLayoutSubview
- (void)viewDidLayoutSubviews
{
[_scrollView setContentSize:CGSizeMake(320, 500)];
}
UIViewController's method invoke sequence is as below
awakeFromNib
viewDidLoad
viewWillAppear
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidAppear
viewDidLoad is not a good place to put code that relies on frame sizes of IB objects. If you log the contentSize of your scroll view in viewDidLoad, you will see that it's (0,0). Move the code (where you set the content size) to viewDidAppear, and it will work properly.
Check these
User Interaction enabled
Outlet connected
Included contentsize greater than bounds
scrolling Enabled
eg
scrollView.contentSize = CGSizeMake(320, 640);
My storyboard looks like this for scrollview [working]
I had exactly the same line of code in viewDidAppear and it did not work
Moved it to viewDidLayoutSubviews and it worked correctly.
[scrollView setContentSize:CGSizeMake(320, 500)];
Thanks trick14 for the answer.
The issue is most probably with Auto Layout. UIScrollView needs special attention when using AutoLayout.
Quick-fix - bind one of the scroll's subviews to the top AND bottom space of it's superview (the scroll view).
Long story:
Questions on SO:
UIScrollView not scrolling regardless of large contentSize,
UIScrollView will not scroll, even after content size set,
UIScrollView doesn't use autolayout constraints
Apple's Documentation:
https://developer.apple.com/library/ios/technotes/tn2154/_index.html
Trip14's answer worked for me. In swift I coded it as:
override func viewDidLayoutSubviews() {
(self.view as! UIScrollView).contentSize = CGSizeMake(600, 600)
}
This seems to be a similar issue. Other Story
It might be an issue with auto layout or constraints in the storyboard.
the best way with the storyboard.:
Related
I currently am making an iOS project in which I have a UIScrollView as a direct subview of a UIWindow (using [window addSubview:scrollView];). The window's frame and its content are being set properly, and the contentSize is set to be bigger than the window's frame. When I try to scroll the UIScrollView, it doesn't scroll at all. Both scrollEnabled and pagingEnabled are set to YES, but the scrollview doesn't scroll, which leads me to believe that the touch/scroll events are not even being received by the scroll view. The window has a UITapGestureRecognizer added to it if it makes any difference. Do I need to somehow forward the swipe events to the UIScrollView, or is there a different reason that it's not scrolling?
EDIT: Here's some code.
float count=ceil([self.msgArray count]/2); //msgArray has length of 3+, NSLog()'d and confirmed.
float contentHeight=97.5 * count;
[dataScrollView setContentSize:CGSizeMake(320,contentHeight)];
dataScrollView.userInteractionEnabled=YES;
dataScrollView.pagingEnabled=YES;
dataScrollView.scrollEnabled=YES;
dataScrollView.clipsToBounds=YES; //Have also tried with this set to NO, or not set at all.
//Add subviews to dataScrollView.
EDIT: Here's some more info.
contentHeight is 195.00 when logged. I've removed the delegate method and I am back to using direct subviews of the scroll view. The window's height is 97.50.
EDIT: I've also removed the UITapGestureRecognizer from the UIWindow, but the scrollview still doesn't scroll.
Ah, the UITapGestureRecognizer! This might be a bug that took me hours to figure out in my own project. Is its cancelsTouchesInView property set to NO like it should be? (YES is the default... It can really throw you off if you're not expecting it.)
Just log the scrollview bounds width/height. The content height you are setting should be greater than the scrollview height. If its more then the scroll view automatically enables its scrolling.
I've created a scroll view, width less than the screen width and set clipsToBounds=YES. As the UIScrollView doesn't scroll from anywhere outside the range of its frame, I put the UIScrollview inside a UIView and tried to override the "(UIView *)hitTest:WithEvent:" method. But it always shows warning pointInside method not found (or something like that) in the if ([self pointInside:point withEvent:event]) line and it doesn't work. What did I do wrong? Thanks in advance...
You have to change the ScrollView's contentSize in order to allow the ScrollView to scroll. It will only scroll it the contentSize.x is bigger than scrollview.size.x and/or contentSize.y bigger than scrollview.size.y.
Answering my own question, the problem is I didn't create the UIVIew subclass to override the (UIView *)hitTest:WithEvent: while the UIScrollView was in a subview of self.view. So, it is important to check which view inherits the scroll view and write overridden method in the parent view class.
When I set my UIScrollView to be the main view within Interface Builder, the scrolling works as expected. However, when I add the UIScrollView as a subview of UIView the scroll does not work.
So it seems my trouble begins when the UIScrollView is added as a subview to UIView.
The "User Interaction Enabled" it true for both view.
I though perhaps I might have to do something with in touchesBegan something lake passing the touches to the UIScrollView, but have not had much luck with that.
Has anyone seen this before?
scrollView.delegate = scrollView; //or nil may work
It's always good to show a complete working code snippet:
// in viewDidLoad:
//UIScrollview *myScrollView;
UIView_descendent *contentView;
// scrollview won't scroll unless content size explicitly set
[myScrollView setContentSize:contentView.frame.size];
I have not found a way to set contentSize in IB.
I have this UIScrollView inside another UIView, not occuping the entire area (all this is initialized via nib file). I added some content to the scroll view, but whenever I scroll it, the UIScrollView content area moves outside the ScrollView frame, over the UIView area not designated for displaying it.
Shouldn't it remain inside its frame even when I scroll it?
It may be that the clipsToBounds property of your UIScrollView is set to NO. Check the setting in IB, or you can set it in code like so:
scrollView.clipsToBounds = YES;
Failing that, double check that your UIScrollView has exactly the bounds you think it does. Is there any autoresizing flag stuff going on that might be changing the scroll view's bounds?
try to set the clipsToBounds to YES, it may be that:
yourViewController.clipsToBounds = YES;
if not... fbreto is right, post your code...
Make sure you have setContentSize. And also set the frame size of the uiviews inside the uiscrollview correctly when you add them.
Here is a sample code of it http://developer.apple.com/library/ios/#samplecode/Scrolling/Introduction/Intro.html
I have a subclass of UIView that I've added to as the titleView of a navigationItem using the following line of code:
self.navigationItem.titleView = tempview;
Easy enough. That works fine. My problem is that this navigationItem sometimes has the rightBarButton updated (sometimes there is no button, sometimes there is one standard sized button, sometimes there is a larger button).
I figured that I could simply use the layoutSubviews method of the tempview class that I've added as the titleView so I put this in:
-(void)layoutSubviews {
[super layoutSubviews];
self.mylabel.frame = self.bounds;
}
This does not seem to work, as it does not correctly resize the titleview when the rightBarButton item is updated.
I've noticed also that the bounds do not grow once they gotten smaller, they simply change the position.
I've tried using setNeedsLayout and layoutIfNeeded but those simply "resize" the view with the incorrect bounds.
I've also made sure that the rightBarButton item is set to nil, but the view still does not correctly expand once shrunk.
Thanks for any help!
configure your view with
[self setAutoresizingMask:UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth];
(probably in the initWithFrame)
then implement
- (void)willMoveToSuperview:(UIView *)newSuperview
{
[self setFrame:[newSuperview bounds]];
}
now you have your view matching the size of the container, and resizing automatically.
By default, layoutSubviews does nothing. You also never change the size of the titleView, so unless a navbar does that for you, it's no surprise that nothing is changing.
Since you're only changing the size of one of the subviews, I don't think autoresize will work, as I'm pretty sure it's triggered when the superview (the one with autoresizesubviews enabled) changes size. I would suggest recalculating the size of the titleview when you change the rightbutton. If it automatically fits when you add it the first time, you could remove and readd it, but I know that's a pretty ugly hack.
Instead of overriding -layoutSubviews have you tried setting the autoresizingMask property?
tempView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;