core-animation

问题 I trying to create a spin wheel which rotate on tap and it rotates for certain period of time and stops at some random circular angle. import UIKit class MasterViewController: UIViewController { lazy var imageView: UIImageView = { let bounds = self.view.bounds let v = UIImageView() v.backgroundColor = .red v.frame = CGRect(x: 0, y: 0, width: bounds.width - 100, height: bounds.width - 100) v.center = self.view.center return v }() lazy var subView: UIView = { let v = UIView() v.backgroundColor

问题 I want to animate the UIView default background layer. In viewDidLoad I'm adding my custom property to animate to the view with: self.layer.delegate = self; [self.layer setValue:0 forKey:@"value"]; as described here. The setter method of the value to change looks like this and updates the added custom property on the background layer: - (void)setValue:(NSInteger)value { _value = value; [self.layer setValue:[NSNumber numberWithInteger:value] forKey:@"value"]; [self setNeedsDisplay]; } And in

问题 I want to animate the UIView default background layer. In viewDidLoad I'm adding my custom property to animate to the view with: self.layer.delegate = self; [self.layer setValue:0 forKey:@"value"]; as described here. The setter method of the value to change looks like this and updates the added custom property on the background layer: - (void)setValue:(NSInteger)value { _value = value; [self.layer setValue:[NSNumber numberWithInteger:value] forKey:@"value"]; [self setNeedsDisplay]; } And in

问题 Here's some relevant code inside a UIView subclass : - (void) doMyCoolAnimation { CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"position.x"]; anim.duration = 4; [self.layer setValue:@200 forKeyPath:anim.keyPath]; [self.layer addAnimation:anim forKey:nil]; } - (CGFloat) currentX { CALayer* presLayer = self.layer.presentationLayer; return presLayer.position.x; } When I use [self currentX] while the animation is running, I get 200 (the end value) rather than a value between 0

问题 Here's some relevant code inside a UIView subclass : - (void) doMyCoolAnimation { CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"position.x"]; anim.duration = 4; [self.layer setValue:@200 forKeyPath:anim.keyPath]; [self.layer addAnimation:anim forKey:nil]; } - (CGFloat) currentX { CALayer* presLayer = self.layer.presentationLayer; return presLayer.position.x; } When I use [self currentX] while the animation is running, I get 200 (the end value) rather than a value between 0

问题 I'm desperately trying to morph a smallLabel into a bigLabel . By morphing , I mean transforming the following properties from one label to match the respective properties of the other label, with a smooth animation: font size font weight frame (i.e. bounds and position) The desired effect should look similar to the animation that is applied to the navigation controller's title label when using large titles: Now I'm aware of last year's WWDC session Advanced Animations with UIKit where they

问题 I'm desperately trying to morph a smallLabel into a bigLabel . By morphing , I mean transforming the following properties from one label to match the respective properties of the other label, with a smooth animation: font size font weight frame (i.e. bounds and position) The desired effect should look similar to the animation that is applied to the navigation controller's title label when using large titles: Now I'm aware of last year's WWDC session Advanced Animations with UIKit where they

问题 I'm desperately trying to morph a smallLabel into a bigLabel . By morphing , I mean transforming the following properties from one label to match the respective properties of the other label, with a smooth animation: font size font weight frame (i.e. bounds and position) The desired effect should look similar to the animation that is applied to the navigation controller's title label when using large titles: Now I'm aware of last year's WWDC session Advanced Animations with UIKit where they

问题 I'm desperately trying to morph a smallLabel into a bigLabel . By morphing , I mean transforming the following properties from one label to match the respective properties of the other label, with a smooth animation: font size font weight frame (i.e. bounds and position) The desired effect should look similar to the animation that is applied to the navigation controller's title label when using large titles: Now I'm aware of last year's WWDC session Advanced Animations with UIKit where they

问题 I'm desperately trying to morph a smallLabel into a bigLabel . By morphing , I mean transforming the following properties from one label to match the respective properties of the other label, with a smooth animation: font size font weight frame (i.e. bounds and position) The desired effect should look similar to the animation that is applied to the navigation controller's title label when using large titles: Now I'm aware of last year's WWDC session Advanced Animations with UIKit where they