iOS_UIButton 简单操作

typedef NS_ENUM(NSInteger, UIButtonType) {
    UIButtonTypeCustom = 0,                         // no button type
    UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0),  // standard system button

    UIButtonTypeDetailDisclosure,
    UIButtonTypeInfoLight,
    UIButtonTypeInfoDark,
    UIButtonTypeContactAdd,

    UIButtonTypeRoundedRect = UIButtonTypeSystem,   // Deprecated, use UIButtonTypeSystem instead
};

    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.tag = 100; // 给 Button 加入标记 在不同的方法中使用同一个控件
    button.frame = CGRectMake(30, 170, 200, 40);
    [self.window addSubview:button];

    // 设置按钮文字。须要设置状态
    [button setTitle:@"按钮" forState:UIControlStateNormal];
// [button setTitle:@"Hello" forState:UIControlStateHighlighted];

    [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]; // 给字体设置颜色 

    button.showsTouchWhenHighlighted = YES; // 高亮

    // 给button绑定事件
    [button addTarget:self // 接受消息的对象
               action:@selector(buttonAction:) // 发送的消息
     forControlEvents:UIControlEventTouchUpInside]; // 触发的方式

- (void) buttonAction
{
    NSLog(@"咔");
    // 通过 tag 。从父类视图中获取button
    UIButton *btn = (UIButton *)[self.window viewWithTag:100];
    ;
    // 让 Button 失效
    ;
}


- (void) buttonAction:(UIButton *)sender
{
    sender.backgroundColor = [UIColor redColor];
}