CGAffineTransformIdentity在多次轉換後不重置UIImageView？

Question

我已經在頂部創建了一個分段控件的簡單應用程序。當我點擊控件的兩個片段之一時，UIImageView開始旋轉。我有一個重置按鈕掛鉤設置其轉換爲CGAffineTransformIdentity。

當執行視圖旋轉動畫的方法通過來回切換片段而被第二次調用時，會發生該問題。點擊重置只會刪除最近的動畫。我必須再次切換片段才能讓動畫完全停止並重置。

當我選擇旋轉UIImageView的段時會調用以下代碼，並且當我在段之間單擊時顯然會調用第二次。

// 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]; 

復位按鈕調用此代碼 -

self.imageView.transform = CGAffineTransformIdentity; 

Answer 1

試試這個

[UIView animateWithDuration:0.2 animations:^() { 

    self.imageView.transform = CGAffineTransformIdentity; 



}];