IOS uiview一个动画的使用 写了个测试记忆力的

 代码很简单  主要看看

+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion

方法的使用

代码如下：

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    arr=[[NSMutableArray alloc] init];

    CGSize size=[[UIScreen mainScreen] bounds].size;

    float x=size.width/3.0;

    float y=size.height/3.0;

    for (int i=0; i<9; i++) {

        UIButton *button=[[UIButton alloc] initWithFrame:CGRectZero];

        button.backgroundColor=[UIColor redColor];

        int d=i%3;

        int t=i/3;

        button.frame=CGRectMake(0+x*d, 0+y*t,x-20, y-10);

        button.tag=i;

        [self.view addSubview:button];

        [arr addObject:button];

    }

    [self showIn];

}

-(void)showIn{

    int r=arc4random()%9;

    UIButton *button=[arr objectAtIndex:r];

   [UIView animateWithDuration:0.1 delay:1.0 options:UIViewAnimationOptionCurveLinear animations:^{

       button.backgroundColor=[UIColor clearColor];

   } completion:^(BOOL finished) {

       button.backgroundColor=[UIColor redColor];

       [self showIn];

   }];

}