ios - 将 UIImageView 从左侧移动到中心

Question

我想将 ImageView 从左侧移动到 View 的中心。

以下是我的代码:

CGPoint origin = self.headerImage.center;
CGPoint target = CGPointMake(0, self.headerImage.center.x);

CABasicAnimation *bounce = [CABasicAnimation animationWithKeyPath:@"position.x"];
bounce.fromValue = [NSNumber numberWithInt:origin.x];
bounce.toValue = [NSNumber numberWithInt:target.x];
[self.headerImage.layer addAnimation:bounce forKey:@"position"];

它必须从左侧开始移动，并在加载 View Controller 时停在中心。但它不能正常工作。我该如何解决这个问题？

Answer 1

1. target 需要表示 View 的中心:CGPointMake(self.view.center.x, self.view.center.y)
2. 更改fillMode removedOnCompletion autoreverses repeatCount 以避免帧更改(动画的最后)

最终代码:

CGPoint origin = self.headerImage.center;
CGPoint target = CGPointMake(self.view.center.x, self.view.center.y);
CABasicAnimation *bounce = [CABasicAnimation animationWithKeyPath:@"position.x"];
bounce.duration = 1;
bounce.fromValue = [NSNumber numberWithInt:origin.x];
bounce.toValue = [NSNumber numberWithInt:target.x];
bounce.fillMode = kCAFillModeForwards;
bounce.removedOnCompletion = NO;
bounce.autoreverses = NO;
bounce.repeatCount = 0;
[self.headerImage.layer addAnimation:bounce forKey:@"position"];
CGAffineTransform transform = CGAffineTransformMakeScale(1.3, 1.3);
self.headerImage.transform = transform;