如何做一个连续循环的UIView动画 [英] how to do a continuous recycling UIView animation

问题描述

以下code移动，从右边的ImageView的左一次，但我想不间断的做。向右移动到左，然后搬回离开屏幕外，重复右再次离开。

 的ImageView = [[UIImageView的页头] initWithFrame：方法CGRectMake（320，200，2635，200）;图像= [UIImage的imageWithContentsOfFile：[一个NSBundle mainBundle] pathForResource：@动物ofType：@PNG]];
               [ImageView的setImage：图像]。[self.view addSubview：ImageView的]。[UIView的beginAnimations：@MoveAndStrech背景：无];
[UIView的setAnimationDuration：40]; // 30
[UIView的setAnimationBeginsFromCurrentState：YES];
CGPoint P，B，A，C，D，E;
p.x = 0;
p.y = 200;imageview.center = P;[UIView的commitAnimations];
 

解决方案

添加以下行：

  [UIView的setAnimationRepeatCount：HUGE_VAL];
[UIView的setAnimationRepeatAutoreverses：YES];
 

或者，如果你的目标的iOS 4.0+然后基于受阻的动画是preferred：

  [UIView的animateWithDuration：40.0f
                      延迟：0.0
                    选项​​：UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionBeginFromCurrentState
                 动画：^（无效）{imageview.center = CGPointMake（0，200）;}
                 完成：NULL];
 

The following code move the the imageview from right to left once, but I want to do continously. move right to to left then move back to left offscreen and repeat right to left again.

imageview=[[UIImageView alloc] initWithFrame:CGRectMake(320, 200, 2635, 200)];

image=[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"animal" ofType:@"png"]]; 
               [imageview setImage:image];

[self.view addSubview:imageview];

[UIView beginAnimations:@"MoveAndStrech" context:nil];
[UIView setAnimationDuration:40];     //30
[UIView setAnimationBeginsFromCurrentState:YES];
CGPoint p, b, a, c, d,e;
p.x = 0;
p.y = 200;

imageview.center=p;

[UIView commitAnimations];  

解决方案

Add the following lines:

[UIView setAnimationRepeatCount: HUGE_VAL];
[UIView setAnimationRepeatAutoreverses: YES];

Or if you target iOS 4.0+ then blocked-based animations are preferred:

[UIView animateWithDuration:40.0f
                      delay:0.0f
                    options: UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse | UIViewAnimationOptionBeginFromCurrentState
                 animations: ^(void){imageview.center = CGPointMake(0, 200);}
                 completion:NULL];

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