UIButton的使用

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.backgroundColor = [UIColor grayColor];
    button.frame = CGRectMake(10, 20, 80,80);
    [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    button.tag = 1;
    [self.view addSubview:button];
   
    UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
    button1.backgroundColor = [UIColor grayColor];
    button1.frame = CGRectMake(10, 110, 80,80);
    [button1 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    button1.tag = 2;
    [self.view addSubview:button1];
   
   
    _label = [[UILabel alloc] initWithFrame:CGRectMake(10, 200, 200, 20)];
    [self.view addSubview:_label];
   
}

-(void)buttonClicked:(UIButton *)btn{
    _label.text = [NSString stringWithFormat:@"%zi",btn.tag];
    NSLog(@"按钮%zi被点击",btn.tag);

}