iOS UIButton selected状态下设置UIControlStateSelected状态下的背景图片 有个蓝色小方块

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如下代码：

  UIButton *button = [UIButton buttonWithType:(UIButtonTypeSystem)];
    button.frame = CGRectMake(100, 100, 50, 50);
    button.backgroundColor = [UIColor blueColor];
    [button setBackgroundImage:[UIImage imageNamed:@"gl_icon_location_share_on"] forState:(UIControlStateSelected)];
    [self.view addSubview:button];
    button.selected = YES;

左上角有个蓝色小矩形。

解决办法：

    button.tintColor = [UIColor clearColor];

-- NORMAL --