KaleidoscopeGame

//创建万花筒视图

for
(NSInteger i = 0; i < 16; i++) {
       
centerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300 -
20 * i, 300 - 20 * i)];
       
centerView.center = self.window.center;
       
centerView.layer.borderColor = [UIColor grayColor].CGColor;
       
centerView.layer.borderWidth = 1;
       
centerView.tag = 200 + i;
       
centerView.layer.cornerRadius = 150 - i * 10;
       
[self.window addSubview:centerView];
       
[centerView release];
    }
   
    //创建控制按钮
   
//启动按钮
    UIButton
*startButton = [UIButton buttonWithType:UIButtonTypeSystem];
   
startButton.frame = CGRectMake(150, 90, 75, 30);
   
startButton.backgroundColor = [UIColor grayColor];
    [startButton
setTitleColor:[UIColor blackColor]
forState:UIControlStateNormal];
    [startButton
setTitle:@"启动" forState:UIControlStateNormal];
   
startButton.titleLabel.font = [UIFont systemFontOfSize:25];
    [startButton
addTarget:self action:@selector(pressStartButton)
forControlEvents:UIControlEventTouchUpInside];
    [self.window
addSubview:startButton];
    //停止按钮
    UIButton
*stopButton = [UIButton buttonWithType:UIButtonTypeSystem];
   
stopButton.frame = CGRectMake(150, 597, 75, 30);
   
stopButton.backgroundColor = [UIColor grayColor];
    [stopButton
setTitleColor:[UIColor blackColor]
forState:UIControlStateNormal];
   
stopButton.titleLabel.font = [UIFont systemFontOfSize:25];
    [stopButton
setTitle:@"停止" forState:UIControlStateNormal];
    [stopButton
addTarget:self action:@selector(pressStopButton)
forControlEvents:UIControlEventTouchUpInside];
    [self.window
addSubview:stopButton];

//需要用到的方法
//点击button启动万花筒
- (void) pressStartButton {
    //使用了定时器,
使视图达到转动的效果
    myTimer =
[NSTimer scheduledTimerWithTimeInterval:0.3 target:self
selector:@selector(colorChange)
userInfo:nil repeats:YES];
}

//点击button停止万花筒
- (void) pressStopButton {
    //当定时器停止运转的时候, 万花筒的效果也就自然结束
    [myTimer
invalidate];
}

//为视图随机添加颜色, 并使靠内视图的颜色赋给靠外视图
- (void)colorChange {
    for
(NSInteger i = 15; i >= 0; i--) {

//使用tag值寻找到相应的视图
       
[self.window viewWithTag:214 -
i].backgroundColor = [self.window viewWithTag:215 - i].backgroundColor;
       
[self.window viewWithTag:215 -
i].backgroundColor = [UIColor colorWithRed:arc4random() % 256 /
255. green:arc4random() % 256 / 255. blue:arc4random() % 256 / 255.
alpha:arc4random() * 11 / 10.];
    }
}