iOS的：简单的动画

我想创建一个简单的动画改变alpha值：iOS的：简单的动画

[UIView beginAnimations:nil context:NULL]; 
[UIView setAnimationDuration:2]; 
[view1 setAlpha:0.00]; 
[UIView commitAnimations];

好这样我改变两秒钟的Alpha值，它工作正常，但我想这件事情：当alpha是0，动画必须开始另一次到alpha = 1 所以动画应该是：alpha 0 - > alpha 1 - > alpha 0 - > alpha 1 - > ...等等，持续时间为2秒。你能帮我吗？

我的完整代码

-(IBAction){ 
FirstViewController *firstViewController = [[[FirstViewController alloc] init]autorelease]; 
[firstViewController.label1 setAlpha:1.00]; 
[firstViewController.label2 setAlpha:1.00]; 
view = firstViewController.viewFirst; //this is my view and I copy in other view 
[self fadeOut:nil finished:nil context:nil];} 

- (void) fadeOut:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { 


[UIView beginAnimations:nil context:NULL]; 
[UIView setAnimationDuration:2]; 
[UIView setAnimationDelegate:self]; 
[UIView setAnimationDidStopSelector:@selector(fadeIn:finished:context:) ]; 
[view setAlpha:0.00]; 
[UIView commitAnimations]; 
} 

- (void) fadeIn:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { 
[UIView beginAnimations:nil context:NULL]; 
[UIView setAnimationDuration:2]; 
[UIView setAnimationDelegate:self]; 
[UIView setAnimationDidStopSelector:@selector(fadeOut:finished:context:) ]; 
[view setAlpha:1.00]; 
[UIView commitAnimations]; 
}

来源

2011-06-17 CrazyDev

- (void) fadeOut:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { 
    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:2]; 
    [UIView setAnimationDelegate:self]; 
    if(animationRunning){ 
     [UIView setAnimationDidStopSelector:@selector(fadeIn:finished:context:) ]; 
    } 
    [view1 setAlpha:0.00]; 
    [UIView commitAnimations]; 
} 

- (void) fadeIn:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { 
    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:2]; 
    [UIView setAnimationDelegate:self]; 
    if(animationRunning){ 
     [UIView setAnimationDidStopSelector:@selector(fadeOut:finished:context:) ]; 
    } 
    [view1 setAlpha:1.00]; 
    [UIView commitAnimations]; 
}

这些互相称呼上的动画结束...

所有你需要做的启动球滚动是电话：

[self fadeOut:nil finished:nil context:nil];

来源

2011-06-17 10:44:14

我会试试..... – CrazyDev 2011-06-17 10:46:35

如果我想停止这个动画？ – CrazyDev 2011-06-17 10:47:18

您可以设置动画完成处理程序（使用基于块的API或+(void)setAnimationDidStopSelector:(SEL)selector），并开始下一个。

或者看看那些方法：

+ setAnimationRepeatCount: 
+ setAnimationRepeatAutoreverses:

来源

2011-06-17 10:42:27 Eiko

+1提及重复和autoreverses。 – 2011-06-17 10:44:42

我想，你可以只使用一个函数（根据以前的答案fu nctions）：

- (void) fadeIn:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { 
    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:2]; 
    [UIView setAnimationDelegate:self]; 
    [UIView setAnimationDidStopSelector:@selector(fadeIn:finished:context:) ]; 
    [view1 setAlpha:mod(1-view1.alpha)]; 
    [UIView commitAnimations]; 
}

的alplha不能为负值，因此国防部必须应用

来源

2011-06-17 11:51:16 aknew

在iOS 4的，以后你可以做

view1.alpha = 1.0; 
    [UIView animateWithDuration:2.0 
          delay:0.0 
         options:UIViewAnimationOptionRepeat|UIViewAnimationAutoReverse 
        animations:^{ 
         view1.alpha = 0.0; 
        } 
        completion:nil 
    ];

来源

2011-06-17 12:44:20 Pieter

您创建一个视图控制器像下面

FirstViewController *firstViewController = [[[FirstViewController alloc] init]autorelease];

然后向它添加动画，但是何时在视图中添加firstViewController.view heirarchy（addSub视图）。也只是打电话

[[[FirstViewController alloc] init]autorelease]

将不会创建标签对象，除非您已覆盖其init方法。如果标签在该时间点分配，请尝试调试。也为动画我使用uiview anitmation与完成块方法

来源

2013-06-01 13:25:03 Atif

iOS的：简单的动画

回答

相关问题