JQShelterView

shelterView,遮罩 就是一个遮罩的背景view，提供了暗色，明色，透明，暗模糊，明模糊，延时删除的功能

 UIButton * btn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 101, 100)];
    btn.backgroundColor = [UIColor redColor];
    [[JQShelterView shareView]addSubview:btn];
    [JQShelterView isDark:YES];//这行不写默认透明

UIButton * btn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 101, 100)];
    btn.backgroundColor = [UIColor redColor];
    [[JQShelterView shareView]addSubview:btn];
    [JQShelterView blurType:BlurTypeLight];

UIButton * btn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 101, 100)];
    btn.backgroundColor = [UIColor redColor];
    [[JQShelterView shareView]addSubview:btn];
    [JQShelterView blurType:BlurTypeDark];