iOS中点击移动，使得手机屏幕的颜色随机变化

最新推荐文章于 2025-10-02 14:57:04 发布

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本文介绍了两种iOS应用中实现触摸移动时颜色变化的效果：一是触摸移动时整个屏幕背景色随机变化；二是触摸移动时在屏幕上创建一个带有随机背景色的视图并跟随手指移动。

1.效果是点击移动，整个屏幕的颜色随机变化

<pre name="code" class="objc">- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    //鼠标移动时，随机获得颜色
    float red = arc4random() % 255;
    float green = arc4random() % 255;
    float blue = arc4random() % 255;
    UIColor *color = [UIColor colorWithRed:red/255 green:green/255 blue:blue/255 alpha:
                      1];
    ;
    self.view.backgroundColor = color;
}

2.效果是移动鼠标时，屏幕上创建出来一个view，只有view的颜色随机变化

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    //从父视图上删除之前move所创建的view
    for (UIView *object in self.imageView.subviews){
        [object removeFromSuperview];
    }
    //创建一个点，来接收每次移动的点
    CGPoint point = [[touches anyObject] locationInView:self.imageView];
    //创建一个视图，每次移动，视图的中心都是move后所获的得point
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(10, 10, 80, 80)];
    //鼠标移动时，随机获得颜色
    float red = arc4random() % 255;
    float green = arc4random() % 255;
    float blue = arc4random() % 255;
    UIColor *color = [UIColor colorWithRed:red/255 green:green/255 blue:blue/255 alpha:
                      1];
    ;
    view.backgroundColor = color;
    [self.imageView addSubview:view];
    view.center = point;
  
}