Question

我在顶部创建了一个带分段控件的简单应用。当我单击控件的两个部分之一时，UIImageView开始旋转。我有一个重置按钮，用于将其转换为CGAffineTransformIdentity。

通过来回切换段来第二次调用执行视图旋转动画的方法时，会出现问题。点击重置只会删除最新的动画。我必须再次切换片段才能让动画完全停止并停止播放。

当我选择要旋转UIImageView的段时调用以下代码，当我在段之间单击时显然第二次调用。

// Begin the animation block and set its name
[UIView beginAnimations:@"Rotate Animation" context:nil];

// Set the duration of the animation in seconds (floating point value)
[UIView setAnimationDuration:0.5];

// Set the number of times the animation will repeat (NSIntegerMax setting would repeat indefinately) (floating point value)
[UIView setAnimationRepeatCount:NSIntegerMax];

// Set the animation to auto-reverse (complete the animation in one direction and then do it backwards)
[UIView setAnimationRepeatAutoreverses:YES];

// Animation curve dictates the speed over time of an animation (UIViewAnimationCurveEaseIn, UIViewAnimationCurveEaseOut, UIViewAnimationCurveEaseInOut, UIViewAnimationCurveLinear)
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

// Changes the imageViews transform property to rotate the view using CGAffineTransformRotate
// CGAffineTransformRotate(transformToStartFrom, angleToRotateInRadians)
// Starting transform property can be set to CGAffineTransformIdentity to start from views original transform state
// This can also be done using CGAffineTransformMakeRotation(angleInRadians) to start from the IdentityTransform without implicitly stating so
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, degreesToRadians(90));

[UIView commitAnimations];

重置按钮调用此代码 -

self.imageView.transform = CGAffineTransformIdentity;

Answer 1

试试这个

[UIView animateWithDuration:0.2 animations:^() {

    self.imageView.transform = CGAffineTransformIdentity;



}];

CGAffineTransformIdentity在多次转换后没有重置UIImageView？

1 个答案: