1 前言
UIButton為按鈕控件，在IOS開發中十分常見，可以為其設置事件。

2 代碼實例
ZYViewController.m：

[plain]
@synthesize myButton; 
 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    self.view.backgroundColor = [UIColor whiteColor]; 
    myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];//設置按鈕樣式為圓角矩形 
    myButton.frame = CGRectMake(110.0f, 200.0f, 100.0f, 37.0f); 
    [myButton setTitle:@"Press Me" forState:UIControlStateNormal];//按下按鈕時候的標題 
    [myButton setTitle:@"I'm Pressed" forState:UIControlStateHighlighted];//按下按鈕後抬手時候的標題 
    [myButton addTarget:self action:@selector(buttonIsPressed:) forControlEvents:UIControlEventTouchDown];//按下按鈕觸發事件 
    [myButton addTarget:self action:@selector(buttonIsTapped:) forControlEvents:UIControlEventTouchUpInside];//按下按鈕後抬手時候觸發事件 
    [self.view addSubview:myButton]; 
} 
 
-(void)buttonIsPressed:(UIButton *)paramSender{ 
    NSLog(@"Button is pressed"); 
} 
 
-(void)buttonIsTapped:(UIButton *)paramSender{ 
    NSLog(@"Button is tapped"); 
} 

@synthesize myButton;

- (void)viewDidLoad
{
    [super viewDidLoad];
 // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];//設置按鈕樣式為圓角矩形
    myButton.frame = CGRectMake(110.0f, 200.0f, 100.0f, 37.0f);
    [myButton setTitle:@"Press Me" forState:UIControlStateNormal];//按下按鈕時候的標題
    [myButton setTitle:@"I'm Pressed" forState:UIControlStateHighlighted];//按下按鈕後抬手時候的標題
    [myButton addTarget:self action:@selector(buttonIsPressed:) forControlEvents:UIControlEventTouchDown];//按下按鈕觸發事件
    [myButton addTarget:self action:@selector(buttonIsTapped:) forControlEvents:UIControlEventTouchUpInside];//按下按鈕後抬手時候觸發事件
    [self.view addSubview:myButton];
}

-(void)buttonIsPressed:(UIButton *)paramSender{
    NSLog(@"Button is pressed");
}

-(void)buttonIsTapped:(UIButton *)paramSender{
    NSLog(@"Button is tapped");
}
運行結果：

點擊按鈕時候：