FXBlurView用法

FXBlurView是UIView的子类，它实现毛玻璃效果的原理其实就是覆盖上一层FXBlurView的实例对象。

- (void)viewDidLoad {
    [super viewDidLoad];

    UIImageView * imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
    imageView.image = [UIImage imageNamed:@"Default-Port-hd47"];
    [self.view addSubview:imageView];

    FXBlurView * aview = [[FXBlurView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    aview.tintColor = [UIColor whiteColor];  //前景颜色
    aview.blurRadius = 20.0;                 //模糊半径
    aview.dynamic = YES;                     //动态改变模糊效果    
    [self.view addSubview:aview];

    FXBlurView * bview = [[FXBlurView alloc] initWithFrame:CGRectMake(0, 120, 100, 100)];
    bview.tintColor = [UIColor whiteColor];  //前景颜色
    bview.blurEnabled = YES;                //是否允许模糊，默认YES
    bview.blurRadius = 10.0;               //模糊半径
    bview.dynamic = YES;                   //动态改变模糊效果
    bview.iterations = 2;                  //迭代次数：
    bview.updateInterval = 2.0;            //更新时间（不确定具体功能）

    /*
     blurRadius ＝ 1.0 && dynamic ＝ 100 的效果和 blurRadius ＝ 10.0 && dynamic ＝ 1的效果大致相同
     */    

    [self.view addSubview:bview];

    FXBlurView * cview = [[FXBlurView alloc] initWithFrame:CGRectMake(150, 0, 200, 200)];
    cview.blurRadius = 20.0;
    cview.tintColor = [UIColor whiteColor];
    [self.view addSubview:cview];
}

demo下载：https://github.com/nicklockwood/FXBlurView