@implementation AppDelegate

-(void)dealloc

{

[_window
release];

[superdealloc];

}

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

self.window = [[UIWindowalloc]initWithFrame:[[UIScreenmainScreen]bounds]];

// Override point for customization after application launch.

self.window.backgroundColor = [UIColorwhiteColor];

[self.windowmakeKeyAndVisible];

[_window
release];

//UILabel显示文本内容

UILabel *label=[[UILabelalloc]initWithFrame:CGRectMake(100,
100, 200, 150)];

label.backgroundColor=[UIColorcyanColor];

[self.windowaddSubview:label];

[labelrelease];

//
设置文本内容

label.text=@"学习iOS! ! !";

//文本内容颜色

label.textColor=[UIColoryellowColor];

//文本对齐方式

label.textAlignment=NSTextAlignmentCenter;

//
字体大小

label.font=[UIFontsystemFontOfSize:25];

//
设置行数

// 0是行数的最大值

label.numberOfLines=3;

//让文本自己去适应尺寸

//    [label sizeToFit];

//断行模式

label.lineBreakMode=NSLineBreakByTruncatingMiddle;

//阴影颜色

label.shadowColor=[UIColorredColor];

//阴影大小

label.shadowOffset=CGSizeMake(2, 1);

//设置边框

label.layer.borderWidth=1;

//设置圆角

label.layer.cornerRadius=100;

label.layer.masksToBounds=YES;

//
中心点的位置  center能够改动视图的位置  frame能够改动尺寸

label.frame=CGRectMake(100, 100, 200, 200);

label.center =CGPointMake(200, 200);

return
YES;

}