UIButton

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UIButton *button  = [UIButton buttonWithType:UIButtonTypeSystem] ;
    button.frame = CGRectMake(60,100,200,200) ;
    [button setTitle:@"button" forState:UIControlStateNormal];
    button.backgroundColor = [UIColor redColor];
    //[button setBackgroundImage:[UIImage imageNamed:@"灯泡.jpg"] forState:UIControlStateNormal];
    //[button setImage:[[UIImage imageNamed:@"灯泡.jpg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forState:UIControlStateNormal];
    //button.contentEdgeInsets = UIEdgeInsetsMake(20, 0, 0, 0); //上左下右
    //button.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 40, 0);
    //button.titleEdgeInsets = UIEdgeInsetsMake(30, 0, 0, 0);
//    button.adjustsImageWhenHighlighted = YES;
    button.showsTouchWhenHighlighted = YES;
    button.tintColor = [UIColor purpleColor];
    button.titleLabel.font = [UIFont boldSystemFontOfSize:30];
    [self.view addSubview:button];
    button.layer.masksToBounds = YES;
    button.layer.cornerRadius = 30;
    [button addTarget:self action:@selector(clickBtn:) forControlEvents:UIControlEventTouchUpInside];
    //button.enabled = NO;
}
- (void)clickBtn:(UIButton *)btn{
    [btn setBackgroundColor:[UIColor colorWithRed:arc4random()%255/255.0
                                            green:arc4random()%255/255.0
                                             blue:arc4random()%255/255.0
                                            alpha:arc4random()%255/255.0]];
    [self.view setBackgroundColor:[UIColor colorWithRed:arc4random()%255/255.0
                                            green:arc4random()%255/255.0
                                             blue:arc4random()%255/255.0
                                            alpha:arc4random()%255/255.0]];


    NSLog(@"%@",btn);
}