----------UI窗口于视图的创建示例----------

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在window上创建赤橙黄绿青蓝紫七个视图，互相嵌套，设置定时器，每秒每个视图随机变换颜色，并且旋转，十秒后停止，视图全部移除。

---AppDelegate.h中声明视图和一个计时的变量

@interface AppDelegate : UIResponder

{

  UIView *view1;

  UIView *view2;

  UIView *view3;

  UIView *view4;

  UIView *view5;

  UIView *view6;

  UIView *view7;

  int second;

}

---AppDelegate.m中实现题中要求

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  CGRect rect = [UIScreen mainScreen].bounds;

  //创建主Window

  self.window = [[UIWindow alloc]initWithFrame:rect];

  self.window.backgroundColor = [UIColor blackColor];

  [self.window makeKeyAndVisible];

 

  //创建View

  view1 = [[UIView alloc]initWithFrame:CGRectMake(70, 70, 250, 250)];

  view1.backgroundColor= [UIColor redColor];

  view1.tag = 1;

 

  view2 = [[UIView alloc]initWithFrame:CGRectMake(15, 15, 220, 220)];

  view2.backgroundColor= [UIColor orangeColor];

  view3 = [[UIView alloc]initWithFrame:CGRectMake(15, 15, 190, 190)];

  view3.backgroundColor= [UIColor yellowColor];

  view4 = [[UIView alloc]initWithFrame:CGRectMake(15, 15, 160, 160)];

  view4.backgroundColor= [UIColor greenColor];

  view5 = [[UIView alloc]initWithFrame:CGRectMake(15, 15 , 130, 130)];

  view5.backgroundColor= [UIColor cyanColor];

  view6 = [[UIView alloc]initWithFrame:CGRectMake(15, 15, 100, 100)];

  view6.backgroundColor= [UIColor blueColor];

  view7 = [[UIView alloc]initWithFrame:CGRectMake(25, 25, 50, 50)];

  view7.backgroundColor= [UIColor purpleColor];

  [self.window addSubview:view1];

  [view1 addSubview:view2];

  [view2 addSubview:view3];

  [view3 addSubview:view4];

  [view4 addSubview:view5];

  [view5 addSubview:view6];

  [view6 addSubview:view7];

 

  second = 10;

  //定时器

  [NSTimer scheduledTimerWithTimeInterval:1

                                    target:self

                                  selector:@selector(timeAction:)

                                  userInfo:nil

                                  repeats:YES];

 

 

 

      return YES;

}

- (void)timeAction:(NSTimer *)timer{

  //七个视图颜色随机变

  view1.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:1];

  view2.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:1];

  view3.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:1];

  view4.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:1];

  view5.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:1];

  view6.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:1];

  view7.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:1];

 

  //旋转

  UIView *view = [self.window viewWithTag:1];

  CGAffineTransform trans = view.transform;

  view.transform = CGAffineTransformRotate(trans, M_PI/10);

 

 

  //十秒后计时器停止，视图移除

  second--;

  if (second < 0) {

      [timer invalidate];

      [view1 removeFromSuperview];

      return;

  }

     

}

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