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];
}
