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

    // Override point for customization after application launch.

    //第一次运行时候加载

    //每次运行只走一次， 系统自动监听

    self.window = [[UIWindow alloc]initWithFrame:CGRectMake(0, 0, 320, 568)];

    //背景颜色设置

    [self.window setBackgroundColor:[UIColor grayColor]];

    //设置主屏幕并显示

    [self.window makeKeyAndVisible];

    //创建UIView

    UIView *aview = [[UIView alloc]initWithFrame:CGRectMake(0, 20, 100, 150)];

    [aview setBackgroundColor:[UIColor orangeColor]];

    [self.window addSubview:aview];

    UIView *bview = [[UIView alloc]initWithFrame:CGRectMake(10, 15, 80, 100)];

    [bview setBackgroundColor:[UIColor redColor ]];

    [aview addSubview:bview];

    UIView *cview = [[UIView alloc]initWithFrame:CGRectMake(20, 20, 50, 50)];

    [cview setBackgroundColor:[UIColor greenColor]];

    [aview addSubview:cview];

    //法1.给属性赋值修改

     cview.frame = CGRectMake(50, 0, 50, 50);

    //法2.

   // [cview setFrame:CGRectMake(50, 0, 50, 50)];

    [aview release];

    //[self.window release];

    //获得试图的父试图

    //强转（UIwindow）

    UIWindow * fatherView = (UIWindow *)[aview superview];

    NSLog(@"father = %@", fatherView);

    //获得父试图的所有子试图

    //返回数组

    NSArray * arr = [aview subviews];

    NSLog(@"subs = %@", arr);

    //插入一个view

    UIView *newView = [[UIView alloc]initWithFrame:CGRectMake(20, 30, 40, 40)];

    [newView setBackgroundColor:[UIColor whiteColor]];

    [aview insertSubview:newView aboveSubview:bview];

    [newView release];

    //放在b之上 但是数组位置在插入view数组位置之后，试图越在前，数组越在后

//管理试图层次

    //把子试图中的newView放到最上面

    [aview bringSubviewToFront:newView];

    NSLog(@"%@", arr);

    NSLog(@"%@", [aview subviews]);

    // 把子试图中的newView放到最下面

    [aview sendSubviewToBack:newView];

    NSLog(@"%@", [aview subviews]);

    //交换两个制定索引位置的子试图

    [aview exchangeSubviewAtIndex:0 withSubviewAtIndex:2];

    NSLog(@"%@", [aview subviews]);

    //把receiver从父图上移除

    //把newview  移除

//    [newView removeFromSuperview];

//    NSLog(@"%@", [aview subviews]);

    //设置隐藏属性

   // aview.hidden = YES;

    [aview setHidden:NO];

    //设置透明度 属性调用

    //bview.alpha = 0.5;

    [bview setAlpha:1];

    //给视图标记

    bview.tag =1;

    //中心点  子视图相对与父视图

    bview.center = CGPointMake(100, 100);

    return YES;

}

iOS 基础 第一节 UIview