uiviewanimation – Page 2

iOS Segue – Left to Right –

May 29, 2023 by Tarik

This is how I achieve the effect without requiring a nav-controller. Try this instead: Swift 4: import UIKit class SegueFromLeft: UIStoryboardSegue { override func perform() { let src = self.source let dst = self.destination src.view.superview?.insertSubview(dst.view, aboveSubview: src.view) dst.view.transform = CGAffineTransform(translationX: -src.view.frame.size.width, y: 0) UIView.animate(withDuration: 0.25, delay: 0.0, options: .curveEaseInOut, animations: { dst.view.transform = CGAffineTransform(translationX: 0, … Read more

How to animate a UIView with constraints in Swift?

May 20, 2023 by Tarik

What you can do is to add the following code in your viewDidAppear method. You firstly make a IBOutlet property of your view’s center Y constraint, and then change its constant value. self.centerYConstraint.constant = 500.0 self.view.layoutIfNeeded() UIView.animateWithDuration(Double(0.5), animations: { self.centerYConstraint.constant = 0 self.view.layoutIfNeeded() })

UIButton can’t be touched while animated with UIView animateWithDuration

May 19, 2023 by Tarik

Swift 5 In my case, when I set button.alpha = 0, the button interaction stops working, no matter if I setup UIViewAnimationOptionAllowUserInteraction as an option. Reason Whenever you define the animation or not, the view’s property is applying to view’s layer immediately. Because of this, when you set the view.alpha=0, you hide the view completely. … Read more

iOS: How to convert UIViewAnimationCurve to UIViewAnimationOptions?

May 6, 2023 by Tarik

The category method you suggest is the “right” way to do it—you don’t necessarily have a guarantee of those constants keeping their value. From looking at how they’re defined, though, it seems you could just do animationOption = animationCurve << 16; …possibly with a cast to NSUInteger and then to UIViewAnimationOptions, if the compiler feels … Read more

Is it necessary to use [unowned self] in closures of UIView.animateWithDuration(…)?

April 25, 2023 by Tarik

No, it is not needed in this case. animations and completion are not retained by self so there is no risk of strong retain cycle.

Test whether a UIView is in the middle of animation

April 4, 2023 by Tarik

A UIView has a layer (CALayer). You can send animationKeys to it, which will give you an array of keys which identify the animations attached to the layer. I suppose that if there are any entries, the animation(s) are running. If you want to dig even deeper have a look at the CAMediaTiming protocol which … Read more

UIView animateWithDuration doesn’t animate cornerRadius variation

March 2, 2023 by Tarik

tl;dr: Corner radius is not animatable in animateWithDuration:animations:. What the documentation says about view animations. As the section on Animations in the “View Programming Guide for iOS” says Both UIKit and Core Animation provide support for animations, but the level of support provided by each technology varies. In UIKit, animations are performed using UIView objects … Read more

How to rotate image in Swift?

February 20, 2023 by Tarik

set ImageView image ImageView.transform = ImageView.transform.rotated(by: CGFloat(M_PI_2)) Swift 5 ImageView.transform = ImageView.transform.rotated(by: .pi) // 180˚ ImageView.transform = ImageView.transform.rotated(by: .pi / 2) // 90˚ ImageView.transform = ImageView.transform.rotated(by: .pi * 1.5) // 270˚

UIView animation vs CALayers

February 16, 2023 by Tarik

Use views for control and layers for eye candy. Layers don’t receive events so it’s easier to use a view for those cases, but when you want to animate a sprite or backgrounds, etc., layers make sense. Events pass right through layers to the backing view so you can have a pretty visual representation without … Read more

Changing back button in iOS 7 disables swipe to navigate back

February 4, 2023 by Tarik

IMPORTANT: This is a hack. I would recommend taking a look at this answer. Calling the following line after assigning the leftBarButtonItem worked for me: self.navigationController.interactivePopGestureRecognizer.delegate = self; Edit: This does not work if called in init methods. It should be called in viewDidLoad or similar methods.