- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    //建立window
    self.window = [[UIWindow alloc ]init];
    //讓window和螢幕的寬高一樣，位置也一樣
    _window.frame =[ UIScreen mainScreen].bounds
 
;//bounds =(0,0,螢幕寬，螢幕高）
    _window.backgroundColor = [UIColor yellowColor];

    //上面兩步相當於
    //self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    //顯示螢幕
    [_window makeKeyAndVisible];


    //建立BlueView試圖
    //開闢空間並初始化
    UIView * blueView = [[UIView alloc]initWithFrame:CGRectMake(100
 
, 100, 100, 100)];
    //對檢視進行設定
    blueView.backgroundColor = [UIColor blueColor];
    //將檢視新增到window來顯示
    [_window addSubview:blueView];

    //釋放檢視物件

    UIView * redView = [[UIView alloc]initWithFrame:CGRectMake(100, 300, 100, 100)];
    //對檢視進行設定
    redView.backgroundColor = [UIColor redColor];
    //將試圖新增到window來顯示
 

    [_window addSubview:redView];

    //釋放檢視物件


    UIView * blackView = [[UIView alloc]initWithFrame:CGRectMake(100, 200, 100, 100)];

    blackView.backgroundColor = [ UIColor blackColor];

    [_window addSubview:blackView];

    //參照blueview（父檢視）左上角的起點位置，
    UIView * orangeView =[[UIView alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];
    orangeView.backgroundColor = [UIColor orangeColor];
    [blueView addSubview:orangeView];

    //修改中心點位置
    //blackView.center = CGPointMake(200, 300);

    CGPoint  tempCenter = blackView.center;
    tempCenter.x = 200;
    tempCenter.y = 350;
    blackView.center = tempCenter;

    [_window release];

    [blueView release];

    [redView release];

    [blackView release ];

    [orangeView release];
#pragma mark----frame,center,bounds
    //frame:可以改變檢視的大小和位置，相對於父檢視
    //center:只能改變檢視的位置
    //bounds：能改變檢視的大小，但是中心點不會改變，相對於自身。但是它會影響這個檢視上所有子檢視的佈局（位置）。
#pragma mark-----新增檢視

    UIView * grayView =[[UIView alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];
    grayView.backgroundColor =[UIColor grayColor];
    [_window insertSubview:grayView atIndex:0];
    [grayView release];
    //將grayview移到最前面（最上面）
    [_window bringSubviewToFront:grayView];
    //將redView從父檢視上移除
    //[redView removeFromSuperview];

    //UIView的相關屬性
    //redView.hidden  = YES;//設定檢視是否隱藏

    redView.alpha = 0.5;//設定透明度，預設1.0   ；
    NSLog(@"%@",redView .superview);//獲取父檢視
    NSLog(@"%@",redView.subviews);//獲取某檢視上的所有子檢視

    grayView.tag = 100;

    UIView * v =[_window viewWithTag:100];
    NSLog(@"%@",v);

#pragma mark----UILable

    UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(100, 400, 200, 60)];
    //設定文字內容（顯示的內容）
    label.text = @"Hello Baby! Can I make L with you!";
    //背景顏色
    label.backgroundColor = [UIColor cyanColor];
    //文字字型
    label.font = [UIFont fontWithName:@"Times New Roman" size:14];
    NSLog(@"%@",[UIFont familyNames]);
    //文字顏色
    label.textColor =   [UIColor redColor];
    //設定對齊方式
    label.textAlignment= 0 ;
    //設定換行模式
    label.lineBreakMode= NSLineBreakByWordWrapping ;
    //設定行數
    label.numberOfLines = 3;
    //設定文字陰影
    label.shadowColor =[ UIColor blackColor];
   //設定陰影的偏移量
    label.shadowOffset = CGSizeMake(20,20);





    [_window addSubview:label];
    [label release];