- (void)viewDidLoad {    [super viewDidLoad];    // 1.1 创建按钮对象//    UIButton *button = [[UIButton alloc] init];    // 注意:设置按钮的类型只能在初始化的时候设置  -> UIButtonTypeCustom    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];        // 1.2 设置按钮的类型//    button.buttonType = UIButtonTypeInfoDark;        // 1.3 设置frame    button.frame = CGRectMake(100, 100, 170, 60);        // 1.4 设置背景颜色//    button.backgroundColor = [UIColor redColor];//    [button setBackgroundColor:[UIColor redColor]];        // 1.5 设置文字    // 分状态的://    button.titleLabel.text = @"普通文字";    [button setTitle:@"普通按钮" forState:UIControlStateNormal];    [button setTitle:@"高亮按钮" forState:UIControlStateHighlighted];        // 1.6 设置文字的颜色    [button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];    [button setTitleColor:[UIColor yellowColor] forState:UIControlStateHighlighted];        // 1.7 设置文字的阴影颜色    [button setTitleShadowColor:[UIColor blackColor] forState:UIControlStateNormal];    [button setTitleShadowColor:[UIColor whiteColor] forState:UIControlStateHighlighted];        button.titleLabel.shadowOffset = CGSizeMake(3, 2);        // 1.8 设置内容图片    [button setImage:[UIImage imageNamed:@"player_btn_pause_normal"] forState:UIControlStateNormal];    [button setImage:[UIImage imageNamed:@"player_btn_pause_highlight"] forState:UIControlStateHighlighted];    //    button.imageView.backgroundColor = [UIColor purpleColor];        // 1.9 设置背景图片    [button setBackgroundImage:[UIImage imageNamed:@"buttongreen"] forState:UIControlStateNormal];    [button setBackgroundImage:[UIImage imageNamed:@"buttongreen_highlighted"] forState:UIControlStateHighlighted];        // 2.0 加到控制器的view中    [self.view addSubview:button];        // 非常重要    /**     *  监听按钮的点击     *  Target: 目标 (让谁做事情)     *  action: 方法 (做什么事情-->方法)     *  Events: 事件     *///    SEL sel = @selector(clickButton:);    [button addTarget:self action:@selector(demo:) forControlEvents:UIControlEventTouchUpInside];}- (void)demo:(UIButton *)btn{    NSLog(@"%@", btn);}