KaleidoscopeGame

创建一个点击button实现万花筒效果的视图

效果图如下所示

//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.windowaddSubview: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.windowviewWithTag: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.];

}

}