UI_UIButton

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (void)dealloc

{

    [_window release];

    [super dealloc];

}

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

   self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

   self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

    [_window release];

    

    //用button自己的便利构造器的方式来创建对象

    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];

    // 指定button的位置和大小

    button.frame = CGRectMake(100,100, 150, 70);

    button.backgroundColor = [UIColor cyanColor];

    [self.window addSubview:button];

    // button不用release

    

    // 给button设置标题

    [button setTitle:@"确认" forState:UIControlStateNormal];

    

    // 标题的字体大小

    button.titleLabel.font = [UIFont systemFontOfSize:40];

    

    // 设置下圆角

    button.layer.cornerRadius =20;

    

    // 边框

    button.layer.borderWidth =1;

                        

    /// 点击方法 button最重要的方法

    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

     

    return YES;

}

- (void)click:(UIButton *)button{

    NSLog(@"测试按钮的点击方法");

}