I have a NSScrollView with a custom view inside and when I resize the NSScrollView, the height grows and it scrolls upward. Unless there is an easier way, I'll probably have to register a notification to see if the view changes size and then adjust the scrollPoint: to a new point. I'm having trouble getting method to work smoothly.
Thanks!
This question comes up from time to time, because it's not obvious.
The content will pin to the top left if [contentView isFlipped] == YES.
Related
I making an ipad application with screen split in half. Each side contains a container and each container holds UIView.
In the left uiView i have a uiScrollView with multiple elements (customs uiview) inside, like a grid but with scroll, and each element support tap gesture.
When i tap each element they work fine and behave like they are suppose to. lets say they do a NSLog(#"tapped!").
Problem comes when i resize either the entire view that holds the scroll view or the Container like so:
navigationVC.view.frame = CGRectMake(0,0, 338,768);
The tap stops working! But if i resize back to its original frame, tap starts working again.
navigationVC.view.frame = CGRectMake(0,0, originalWidth ,768);
I thought the problem would be the elements re-arrange when i resize the scroll view, but in fact its not.
The frame is being resized when i swipe the entire application either left or right.
EDIT:
Behaviour diagram: http://i.imgur.com/4vKpHLQ.png?1
EDIT2: didnt figure it out yet, but i see now that element bound's are changing when the frame is resized.
Got it!
Problem was that when i resized the scrollView the elements.Bounds where changing too. Then i went digging why... could only be something like a anchor... i then started to change a few properties on my XIB.
Under "Simulated Metrics", changed the "Size" drop-down from "Freeform" (add 150, 45) to "Inferred".
Forced the size on initWithCoder, compiled, and it worked.
Thanks Burhanuddin Sunelwala for trying to debug this with me.
I am developing a iOS-6 app. I have a UIViewController with a view that needs fixed orientation (portrait mode). But when the phone is rotated, one control on that view needs to be moved and rotated (so that it will always be in the upper left corner, and its text will be readable).
I am achieving this by shifting the control(a UIView) using the frame-property of my control (it is a custom view, more on that later), and then using CGAffineTRansformMakeRotate() afterwards, since I know that it's not advisable to use the frame after rotating a view. Everything is fine so far, but here's the thing: That custom view has three UIButtons of type UIButtonTypeCustom as its subviews. Because I rotated the View, but cannot rotate the buttons inside the view (they are not squares), I need to rotate the titleLabels of the Buttons for the text to be readable in the new deviceOrientation.
But it won't work very well. The text will be rotated, as I intended, but it will be clipped by the titleLabel, because the titleLabel has the wrong frame. I checked this by applying borders to the label. So I need to change the titleLabels frame, right? But how can I do that? I tried setting it using [titleLabel setFrame: frameThatFits];, but to no avail. (frameThatFits is a CGRect I created). Also, calling [button.titleLabel sizeToFit]; has no effect that I could see.
I am using [button setTitle:title forControlState: UIControlStateNormal];to set the title.
TL;DR: I'm trying to change the frame/bounds of a UIButtons titleLabel after rotating it using an affine transformation. Any help?
Thanks.
PS: I can supply code when needed, but I wouldn't know what to show you. Tell me what you need, I'll post it.
OK, first of all, thanks to everyone who tried to help. Im posting an alternative solution for my problem, and although it doesnt really address the problem of changing the titleLabels dimensions, it will result in the proper display of my ViewController.
It turns out using the frame is a bad idea. I initially used the frame to reposition the view and i figured that this couldnt be a problem because i only ever applied transformations afterwards, but i was wrong. Because OBVIOUSLY i tried to change the titleLabels frame. AFTER the rotation. And that didnt work.
So the way to go here is using the center-property and the bouds of the view consistently throughout the code. It will result in properly rotated Buttons, that do not need any fidgeting afterwards.
My takeaway here is that i will never ever again use the frame-property outside of a NSLog-statement. But why [button sizeToFit];wouldnt yield any results is still beyond me. If i ever figure it out, i might post it if i remember.
EDIT:
#ZevEisenberg nailed it with this comment:
“Warning: If the transform property is not the identity transform, the value of this property is undefined and therefore should be ignored.” So you are right to use the center and bounds here, but if you do not have a transform, the frame is perfectly safe to use.
NEXT EDIT:
Heres how i ended up repositioning the Buttons:
-(CGPoint)centerForView:(UIView *)view{
//calculate a suitableposition for the view
//depending on the current orientation and the device type (iphone 4S/5, etc)
return point;
}
Then, as a reaction to the deviceOrientation change notification, i apply CGAffineTransformIdentity to all the views, reposition them using my centerForView shown above, and apply the correct rotation transformation to the View. I do this for all the subviews every time the divice rotates, like so:
-(void)setRightRotationTransformations{
[self resetAllTransformations];
self.someSubview.transform = CGAffineTransformRotate(self.someSubview.transform, -M_PI_2);
}
In my case works such hack:
set Line Break mode to Word Wrap
Add extra line to title (even for one line title)
I have an app in which a UIScrollView of the dimensions 1056x96 on top of a screen which is 480x320 (it is in landscape.) It contains 9 UIBUttons. It definitely is able to scroll, as when I set 'bounces horizontally' to true I can clearly see it bouncing back as soon as I attempt to scroll. It simply will not scroll beyond the bounds of the screen, and I have set its contentSize to 1056x960. Does anybody have a helpful suggestion as to why this is happening? Thanks in advance!
It appears that the contentSize property must be larger than the size of the UIScrollView its self. Once I made the size of that larger, it seemed to work fine.
Also, make sure your viewForZoomingInScrollView is set to the subview rather than the scroll view itself. For example:
- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return self.menuView;
Do you have 'userInteractionEnabled' flag set to true?. Is the scrollView embedded into another view?. If so... please, check the 'userInteractionEnabled' flag as well.
Besides that, please, check if the flag 'scrollEnabled' is enabled both in your nib and in your code.
I have a UIImageView contained within a UIScrollView. The image is (usually) big, so the user can zoom it out in order to see the whole thing.
Upon zooming out, though, UIScrollView snaps the ImageView to the top-left of the scrollview. I want this to be positionable by the user, and haven't found a way to "turn it off" yet.
It's kinda like always allowing scrolling, rather then only allowing scrolling when the image is zoomed in. Maybe it's too major of a change?
Anyone know of a way? Originally, I was just going to create this functionality manually. But UIImageViews don't like to adjust to new sizes (I've tried about everything and can't get UIImageView to resize UNLESS I remove the picture from the imageView, change the frame, and re-add it).
I ended up disabling the UIScrollView's panGestureRecognizer and subbing in a custom one.
Here's a quick snippet on how to disable it:
// Disable our GestureRecognizer
for (UIGestureRecognizer *gesture in scrollView.gestureRecognizers){
if ([[NSString stringWithFormat:#"%#",[gesture class]] isEqualToString:#"UIScrollViewPanGestureRecognizer"]){
[gesture setEnabled:NO];
break;
}
}
A bit of a hack-job there, but it's due to the fact that UIScrollViews have changed the class of the GestureRecognizer to "UIScrollViewPanGestureRecognizer." The compiler will yell at you if you try to use that class (there's probably a better solution out there).
If you locate the UIImageView at location 0,0 in the UIScrollView, then that's always going to be the upper-left. If you want it to be centered in the scrollview when it's smaller than the view, you need to position it there. Check whether its -size is bigger or smaller than the scrollview's. If it's smaller than the scrollview, set its -center to be the same as the scrollview's.
Couldn't find anything on the net about this and wondered if anyone on SO has a solution.
I have an NSView with several subviews that are centered by removing the left and right anchor points. When I resize my view, programatically or with the mouse, to a smaller width than the subviews: it pushes them off center. Has anyone come across this before and do you have a solution?
EDIT: I want to be able to resize my view to a zero width. The reason being, the view is actually part of a split view and I have hooked up a button to 'collapse' it. When it collapses all of the subviews are pushed off-center and aren't re-centered when the view is resized, effectively un-collapsing it.
I have solved my problem now and thought I would share incase anyone comes across this issue in the future.
No amount of playing with autosizing options or view layouts in Interface Builder seemed to stop my subviews from getting moved off center. I did manage to find this link here and from this page, the advice:
Springs and struts, as currently
implemented, are really no good for
anything but keeping either one or
both sides of a view "stuck" to the
nearest edge. Any sort of centering
behavior, division of gained/lost area
between multiple views, etc. has to be
done by hand.
Based on this I overrode my view's setFrame: method and manually laid out my subviews using their setFrame: method. This works great and gives me the results I'm looking for.
There is the same issue using NSSplitView, resizing here one Subview to be smaller than the Subview Subviews makes sense,e.g. having small charts in the upper subview, and an rss reader in the lower subview.
If you want to show only the rss reader in the lower subview, you can "hide" the upper subview, but after resizing the upper subview the NSImageView are not layed out the same as in the beginning. Check this nib/xCode Project and the following screenshot to see this behaviour.
Only workaroung is to override the resize function to stop getting smaller.