I have two view controllers with a custom flip animation as the transition. This is the guide I followed for the transitions: http://www.objc.io/issue-5/view-controller-transitions.html. This works fine, except the view clipped to the bounds that constrain the view while stationary. During the animation, the view exceeds these bounds to simulate some perspective.
What I have found is that there is a UINavigationTransitionView added to the subview tree during the animation. This has clipsToBounds set to YES, which I don't want.
I can intercept this view and change clipsToBounds to NO by placing this at the top of the navigation controller delegate method navigationController:animationControllerForOperation:fromViewController:toViewController:
UIView *firstSubview = [view.subviews firstObject];
firstSubview.clipsToBounds = NO;
But this is very hacky at best. Is there a setting to disable clipsToBounds during the view controller transition?
Related
I don't know if this is possible and I highly doubt that it is but I'm wondering if there's a way where I can prevent a button for example from scrolling in a UIScrollView using Objective-C programming?
Sure. Simply update the button's origin as the scroll view scrolls.
In your view controller, implement the appropriate scroll view delegate method. If not done already, setup your view controller as the scroll view's delegate.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGPoint offset = scrollView.contentOffset;
CGRect frame = self.fixedButton.frame;
frame.origin.y = offset.y + 40;
self.fixedButton.frame = frame;
}
This will keep the self.fixedButton button 40 points below the top of the visible portion of the scroll view. Adjust as needed.
The above all assumes the button is a subview of the scroll view.
Of course it may be a lot easier if the button and the scroll view share a common parent view. Then the button isn't a subview of the scroll view and won't scroll at all.
I have a view controller that on certain action presents another view controller that covers bottom half of the screen.
When I animate the second view controller (presented view controller) from the bottom to cover the bottom half of the screen, I also want animate the presenting view to top half of the screen. See the code below -
- (void)animatePresentationWithTransitioningContext:(id<UIViewControllerContextTransitioning>) transitioningContext
{
UIViewController *presentedController = [transitioningContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView *presentedControllerView = [transitioningContext viewForKey:UITransitionContextToViewKey];
UIView *containerView = [transitioningContext containerView];
presentedControllerView.frame = [transitioningContext finalFrameForViewController:presentedController];
CGPoint center = presentedControllerView.center;
center.y = containerView.bounds.size.height;
presentedControllerView.center = center;
[containerView addSubview:presentedControllerView];
// This returns nil
UIView *presentingControllerView = [transitioningContext viewForKey:UITransitionContextFromViewKey];
[UIView animateWithDuration:[self transitionDuration:transitioningContext] delay:0.0 usingSpringWithDamping:1.0 initialSpringVelocity:0.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
CGPoint presentedViewCenter = presentedControllerView.center;
presentedViewCenter.y -= containerView.bounds.size.height/2.0;
presentedControllerView.center = presentedViewCenter;
// This is where I want to move the presenting view controller.
// of course it does not work.
CGPoint presentingViewCenter = presentingControllerView.center;
presentingViewCenter.y -= containerView.bounds.size.height/2.0;
presentingControllerView.center = presentingViewCenter;
} completion:^(BOOL finished) {
[transitioningContext completeTransition:finished];
}];
}
The viewForKey:UITransitionContextFromViewKey returns nil. I overrode shouldRemovePresentersView to return NO in my custom UIPresentationController but I still get nil. I am using UIModalPresentationCustom as the modal presentation style for the view that I am presenting.
EDIT:
I realized that I can achieve the same affect by animating the presenting view by overriding the presentationTransitionWillBegin method in my custom UIPresentationController. But I would like to get an answer on accessing the presenting view controller.
EDIT:
Since I have found a solution, clarifying my question: (1) Is this the expected behavior i.e. the presentingViewController is going to be nil in the animator object?
I am using UIModalPresentationCustom as the modal presentation style for the view that I am presenting.
Well, there's your problem. In that case, the From view will be nil. It is nil unless you are using the FullScreen presentation style.
I'm not saying you are wrong to make the presentation style Custom. You need to do that, if you want to leave the presenting view controller's view in place, and if you want to supply your own presentation controller. And you do! But in that case, the work is divided: it is the presentation controller that becomes responsible for the final position of the view.
By the way, it occurs to me (thinking about it some more) that you are doing something you should probably not be doing. You are not expected to move the presenting view controller's view. It might be safer to take a snapshot view of the presenting view controller's view and animate that, behind your presented view controller's view.
I have some subviews that I place inside each of my tab bar's view controllers. Right now I'm sizing it with a pixel count but it only works on the iPhone 4 and 4s and not the iPhone 5 because of the longer screen size. I could check for the device and then size it that way but I feel like there has to be an easier way to do this.
viewController1.view.frame = CGRectMake(0, 0, 320, 460);
I colored the subview yellow so it's easier to see.
You should NOT change frame of tabbar's content view controller's view. UITabBar takes itself care of sizing the child view controller's frame properly.
If you want to add subview to content view controller (controller under some tab) and make that view to always automatically resize with the controllers main view (self.view), you can use combination of superviews frame and autoresizing.
Example code (you can do this in - (void)viewDidLoad for example):
UIView *view = [[UIView alloc] initWithFrame:self.view.bounds];
view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:view];
If you want to do this by setting frame than DO this:
[childView setFrame:childView.superview.bounds];
The master view in your view controller should already be the size of the usable space on the sceen. In general, if you want a view to be the same size as it's parent, you can use view.frame = view.superview.frame, though I doubt that would be a good idea to call on the view controller's view.
I can't figure out how to actually use NSScrollview. I dragged the scroll view object onto an NSWindow in the interface builder. I then dragged some NSButtons onto the scroll view. My question is:
How do I actually make it scroll down, for example, 2x the original height?
Of course the user can scroll automatically using their UI. I assume what you want to do is to scroll programmatically.
A bit of background: An NSScrollView has a documentView, which is the underlying view that the scroll view shows a part of, and a clipView, which is the view that is shown on the screen. So the clip view is like a window into the document view. To scroll programmatically you tell the document view to scroll itself in the clip view.
You have two options on how to scroll programmatically:
- (void)scrollPoint:(NSPoint)aPoint –– This scrolls the document so the given point is at the origin of the clip view that encloses it.
- (BOOL)scrollRectToVisible:(NSRect)aRect –– This scrolls the document the minimum distance so the entire rectangle is visible. Note: This may not need to scroll at all in which case it returns NO.
So, for example, here is an example from Apple's Scroll View Programming Guide on how to scroll to the bottom of the document view. Assuming you have an IBOutlet called scrollView connected up to the NSScrollView in your nib file you can do the following:
- (void)scrollToBottom
{
NSPoint newScrollOrigin;
if ([[scrollview documentView] isFlipped]) {
newScrollOrigin = NSMakePoint(0.0,NSMaxY([[scrollview documentView] frame])
-NSHeight([[scrollview contentView] bounds]));
} else {
newScrollOrigin = NSMakePoint(0.0,0.0);
}
[[scrollview documentView] scrollPoint:newScrollOrigin];
}
I'm new to Cocoa and I'm programming a custom InspectorView.
A parent view (InspectorView) contains several subviews (InspectorCategories).
If I uncollapse a category (subview) I have to resize/relayout my parents view?
I found out that this is not possible through autoresize masks - Is this correct?
I tried it with resizeSubviewsWithOldSize in my parents view but this gets not called while resizing the subview.
How can I achieve this behavior?
There are two parts to accomplish what I think you want:
(a) In the parent view, override the sizeThatFits: method so that it computes a new size that fits around the resized subview.
(b) In the subview, override the setFrame: method and after the frame size is changed, it calls [self.superview sizeToFit] to resize the superview, perhaps like this:
-(void)setFrame:(CGRect)newFrame
{
[super setFrame:newFrame];
[self.superview sizeToFit];
}
No, it is not possible to do through autoresizing masks. Autoresizing mask defines how the view is resized when its superview changes bounds.
The subview should let its superview know what size it needs, for example through a delegate call. The superview then should resize itself and the subview.