UI控件（UIButton）

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //  UIButtonTypeCustom = 0,         自定义风格
    //  UIButtonTypeRoundedRect,        圆角矩形
    //  UIButtonTypeDetailDisclosure,   蓝色小箭头按钮
    //  UIButtonTypeInfoLight,          亮色感叹号
    //  UIButtonTypeInfoDark,           暗色感叹号
    //  UIButtonTypeContactAdd,         十字加号按钮
    button_ = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    
    //[button setTitle:@"注册" forState:UIControlStateNormal];
    
    UIImage *normalImage = [UIImage imageNamed:@"icon_u1.png"];
    UIImage *pressedImage= [UIImage imageNamed:@"icon_u10.png"];
    
    //    UIControlStateNormal          正常状态
    //    UIControlStateHighlighted     高亮状态
    //    UIControlStateDisabled        禁用状态
    //    UIControlStateSelected        选中状态
    [button_ setBackgroundImage:normalImage forState:UIControlStateNormal];
    [button_ setBackgroundImage:pressedImage forState:UIControlStateDisabled];

    [button_ setFrame: CGRectMake(10, 30, 50, 50)];
    
    //  UIControlEventTouchDown       单点触摸按下
    //  UIControlEventTouchDownRepeat 多点触摸按下，多个手指
    //  UIControlEventTouchUpInside   控件触摸的抬起事件
    //  UIControlEventAlltouchEvents  所有触摸事件
    [button_ addTarget:self action:@selector(doClick) forControlEvents:UIControlEventTouchDown];
    
    [self.view addSubview:button_];    
}

-(void)doClick{
    NSLog(@"%s", __FUNCTION__);
    //禁止该按钮点击
    button_.enabled = NO;
}

@end