如何为 UIViews 'center' 属性设置动画？

Question

正如我在 Apple documentation 中读到的那样，我能够为 UIView.

的 'center' 属性设置动画

我正在使用 CAKeyframeAnimation 来执行此操作并为该动画提供三个关键帧和三个 CGPoint。

动画似乎不工作。我是不是做错了什么？

NSMutableArray* values = [NSMutableArray new];
[values addObject:@(CGPointMake(0, 0))];
[values addObject:@(CGPointMake(5, 8))];
[values addObject:@(CGPointMake(10, 8))];

NSMutableArray* keyTimes = [NSMutableArray new];
[keyTimes addObject:@(0)];
[keyTimes addObject:@(0.5)];
[keyTimes addObject:@(1)];

NSMutableArray* timingFunctions = [NSMutableArray new];
[timingFunctions addObject:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]];
[timingFunctions addObject:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

CAKeyframeAnimation* myAimation = [CAKeyframeAnimation animationWithKeyPath:@"center"];
myAimation.duration             = 0.5;
myAimation.values               = values;
myAimation.timingFunctions      = timingFunctions;
myAimation.keyTimes             = keyTimes;

[myView.layer addAnimation:myAimation forKey:nil];

Answer 1

尝试将键路径从 "center" 更改为 "position" 我的 swift 代码正在使用这个

    func animate() {
    var values: [AnyHashable] = []
    values.append(NSValue(cgPoint: CGPoint(x: 0, y: 0)))
    values.append(NSValue(cgPoint: CGPoint(x: 200, y: 140)))
    values.append(NSValue(cgPoint: CGPoint(x: 140, y: 200)))

    var keyTimes: [NSNumber] = []
    keyTimes.append(NSNumber(value: 0))
    keyTimes.append(NSNumber(value: 0.5))
    keyTimes.append(NSNumber(value: 1))

    var timingFunctions: [AnyHashable] = []
    timingFunctions.append(CAMediaTimingFunction(name: .easeOut))
    timingFunctions.append(CAMediaTimingFunction(name: .easeInEaseOut))

    let myAimation = CAKeyframeAnimation(keyPath: "position")
    myAimation.duration = 0.5
    myAimation.values = values
    myAimation.timingFunctions = timingFunctions as? [CAMediaTimingFunction]
    myAimation.keyTimes = keyTimes       
    myView.layer.add(myAimation, forKey: nil)
    }

Answer 2

它不会起作用，因为center 不是 CALayer 的属性。

您可以从

查看完整列表

您也可以从苹果网站阅读：https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CoreAnimation_guide/AnimatableProperties/AnimatableProperties.html#//apple_ref/doc/uid/TP40004514-CH11-SW1

尝试[CAKeyframeAnimation animationWithKeyPath:@"position.x"];。

如何为 UIViews 'center' 属性设置动画？

How to animate a UIViews 'center' property?

core-animation

ios

如何为 UIViews 'center' 属性 设置动画？

How to animate a UIViews 'center' property?

core-animation

ios

如何为 UIViews 'center' 属性设置动画？