iOS自學-監聽按鈕點選、提醒框

//事件監聽的問題
    CGRect btn2Frame = CGRectMake(100.0, 150.0, 60.0, 44.0);
    //兩種不同的方式建立
    UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn2.frame =btn2Frame;
    //設定Title
    [btn2 setTitle:@"BTN2" forState:UIControlStateNormal];
    //[btn2 setBackgroundImage:[UIImage imageNamed:@"pic.png"] forState:UIControlStateNormal];
    [btn2 setBackgroundColor:[UIColor blueColor]];
    [btn2 addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn2];

-(void)btnPressed:(id)sender{
    UIButton* btn = (UIButton*)sender;
    NSLog(@"====>name");
    //    UIButton* thisBtn = (UIButton *)sender;
    //    [[[UIAlertView alloc] initWithTitle:@"Button" message:[NSString stringWithFormat: @"This is button:%@ action",thisBtn] delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil] show];
    
}      

 提醒框

-(void) someButtonClicked{
    
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                     message:@"您點選了動态按鈕！"
                                                    delegate:self
                                           cancelButtonTitle:@"确定"
                                           otherButtonTitles:@"第二項", @"第三項", nil] ;
    [alert show];
}