动画transform.scale与预期UIViewAnimationOptionBeginFromCurrentState不工作 [英] Animate transform.scale with UIViewAnimationOptionBeginFromCurrentState not working as expected

问题描述

我要的UIView（self.square）的规模财产动画〜10％：

I want to animate scale property of UIView (self.square) to 10%:

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    [UIView animateWithDuration:2
                      delay:0.0
                    options: UIViewAnimationOptionBeginFromCurrentState
                 animations:^{
                     self.square.layer.affineTransform = CGAffineTransformMakeScale(0.1f, 0.1f);
                 }completion:^(BOOL finished){

                 }];
    [self performSelector:@selector(animationInterrupt) withObject:nil afterDelay:1];
}

我想在中间（例如：与用户交互）与动画规模某处中断动画恢复到100％：

I want to interrupt animation somewhere in the middle (e.g.: with user interaction) with animate scale back to 100%:

- (void)animationInterrupt {
   [UIView animateWithDuration:1
                      delay:0.0
                    options: UIViewAnimationOptionBeginFromCurrentState
                 animations:^{
                     self.square.layer.affineTransform =  CGAffineTransformMakeScale(1.0f, 1.0f);
                 }completion:^(BOOL finished){

                 }];
}

这样的动画产量是很奇怪的。在某些时刻它扩展self.square超过100％：

Output of such animation is very strange. In some moment it scales self.square over 100%:

推荐答案

我发现了以下工作

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.


    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 1.0
                                                      target: self
                                                    selector:@selector(transform)
                                                    userInfo: nil repeats:YES];
    [timer fire];
}    

转换功能检查，如果动画已​​经在运行，并设置fromvalue到当前值

The transform function checks if the animation is already running and sets the fromvalue to the current value

- (void)transform {
    double toValue = 0.1;
    if (self.goingUp) toValue = 1.0;
    self.goingUp = !self.goingUp;
    CATransform3D oldTransform = [(CALayer *)[self.transforemer.layer presentationLayer] transform];
    double fromValue = oldTransform.m11;

    double duration = toValue - fromValue;
    if (fromValue > toValue) duration = fromValue - toValue;
    duration *= 2;

    CGAffineTransform scaleTransform = CGAffineTransformMakeScale(toValue, toValue);
    self.transforemer.transform = scaleTransform;

    CABasicAnimation *shrink = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    shrink.toValue = [NSNumber numberWithDouble:toValue];
    shrink.fromValue = [NSNumber numberWithDouble:fromValue];
    shrink.duration = duration;
    shrink.fillMode=kCAFillModeForwards;
    shrink.removedOnCompletion=NO;

    [self.transforemer.layer addAnimation:shrink forKey:@"transformScale"];
}

在这里看到的输出：

The output seen here:

使用您可以使用code在您的情况最少的努力。

With a minimal effort you can use the code in your situation.

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