UIButton 即按钮，一般用于点击事件传递

初始化方法

 UIButton *button = [UIButton new];
 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
 UIButton *button = [[UIButton alloc]init];
 UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];

添加事件

 [button addTarget:self action:@selector(show:)forControlEvents:UIControlEventTouchUpInside];
// 参数说明  addTarget:谁来控制 ，action：事件 forControlEvents: 按钮状态（详见UIControlEvents），addTarget:谁来控制 理解可能有误

-(void)show:(id)sender{
    NSLog(@"点击事件");
}

常用属性（方法）

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通过系统头文件可以得知UIButton内部组成是UIImageView + UILabel，当然父类还是UIControl，所以UIView 的属性基本可以在UIButton中使用，如backgroundColor,layer...

//设置title，即内部UILable， title：标题 ，state：状态
- (void)setTitle:(nullable NSString *)title forState:(UIControlState)state;  // default is nil. title is assumed to be single line
//设置按钮中 显示文字的颜色，即内部UILable的标题颜色， color：颜色 ，state：状态
- (void)setTitleColor:(nullable UIColor *)color forState:(UIControlState)stateUI_APPEARANCE_SELECTOR; // default if nil. use opaque white
//设置图片，即内部UIImageView 的图片 ，image：图片 ，state：状态
- (void)setImage:(nullable UIImage *)image forState:(UIControlState)state;                     // default is nil. should be same size if different for different states

创建UIButton并添加到视图

    UIButton *button = [UIButton buttonWithType:0];
    button.frame = CGRectMake(60, 150, 300, 40);
    [self.view addSubview:button];
    [button setTitle:@"你是魔鬼吗？" forState:0];
    [button addTarget:self action:@selector(touchButton:) forControlEvents:7];
    [button setTitleColor:[UIColor blueColor] forState:0];
    button.titleLabel.font = [UIFont systemFontOfSize:20];
    button.backgroundColor = [UIColor redColor];
    
    // Do any additional setup after loading the view, typically from a nib.
}
-(void)touchButton:(id)sender{
    UIButton *button = sender;
    if ([button.titleLabel.text isEqualToString:@"你是魔鬼吗？"]) {
        [button setTitle:@"我是你爹!" forState:0];
    }else{
        [button setTitle:@"你是魔鬼吗？" forState:0];

    }
}

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