objective-c - UIButton 在 CABasicAnimaton 之后在错误的位置接收到 touchEvents

Question

我想给按钮添加一个动画，使按钮从 A 点移到 B 点。
下面的代码可以做到。但是奇怪的是当按钮被移动时，它再也检测不到触摸了。
如果你和我点击按钮的原始位置，它可以触发按钮事件。我的代码中是否缺少任何内容？请帮助我。

- (IBAction)button:(id)sender
{

UIButton    *lineButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[lineButton addTarget:self   action:@selector(press:)forControlEvents:UIControlEventTouchUpInside];
[lineButton setFrame:CGRectMake(50, 50, 50, 50)];
[self.view addSubview:lineButton];
CABasicAnimation *lineAnimation;


lineAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
[lineAnimation setRemovedOnCompletion:NO];
[lineAnimation setDuration:0.15];


[lineAnimation setFillMode:kCAFillModeForwards];
[lineAnimation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]];

CGRect rect = CGRectMake(100, 200, 50, 50);
    lineAnimation.fromValue = [NSValue valueWithCGPoint: CGPointMake(50, 50)];
    lineAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(CGRectGetMidX(rect),   CGRectGetMidY(rect))];
[lineAnimation setAutoreverses:NO];
[lineButton.layer addAnimation:lineAnimation forKey:@"line"];
}

Answer 1

您必须在 addAnimation 方法之后将新的框架和层设置为按钮的框架/层，例如:

lineButton.frame = rect
lineButton.layer.frame = rect

或者您可以简单地使用动画 block (更易于使用，代码看起来不错，等等)，例如:

[UIView animateWithDuration:0.15 animations:^{
  lineButton.frame = CGRectMake(100, 200, 50, 50);
}];