單擊一個已有的按鈕後自動創建一個新的按鈕，並為新按鈕添加事件，使得單擊時彈出提示框。

在viewcontroller.h中添加

@property (weak, nonatomic) IBOutlet UIButton *addbutton;

為這個按鈕添加響應事件addbutton

在viewcontroller.m中添加

- (IBAction)addButton:(id)sender {

//動態添加一個按鈕

CGRect frame = CGRectMake(0, 0, 300, 50);

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

button.frame = frame;

[button setTitle:@"新添加的動態按鈕" forState: UIControlStateNormal];

button.backgroundColor = [UIColor redColor];

button.tag = 2000;

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

[self.view addSubview:button];

}

//這個是新按鈕的響應函數

-(IBAction) buttonClicked:(id)sender {

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"

message:@"單擊了動態按鈕！"

delegate:self

cancelButtonTitle:@"確定"

otherButtonTitles:nil];

[alert show];

}