iOS 基础 第一节 UIview

- (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;

}