本文实例分享两种iOS毛玻璃效果设置的方法，不需要任何第三方，先看效果：

原图：

方法一（iOS8系统方法）：

方法二：

下面是示例代码：

#import "ViewController.h" 

@interface ViewController ()
{
 UIImageView *_imageView;
}
@end 

@implementation ViewController 

- (void)viewDidLoad {
 [super viewDidLoad];
 _imageView = [[UIImageView alloc]initWithFrame:self.view.bounds];
 _imageView.image = [UIImage imageNamed:@"1.jpg"];
 [self.view addSubview:_imageView]; 

 //方法一：系统方法，iOS8及以上可用
 if (!UIAccessibilityIsReduceTransparencyEnabled()) {
 UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
 UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc]initWithEffect:blurEffect];
 blurEffectView.frame = _imageView.bounds;
 [_imageView addSubview:blurEffectView];
 } 

 //方法二：Core Image
 UIImageView *blurImageView = [[UIImageView alloc]initWithFrame:_imageView.bounds];
 blurImageView.image = [self blur:[UIImage imageNamed:@"1.jpg"]];
 [_imageView addSubview:blurImageView];
} 

//生成一张毛玻璃图片
- (UIImage*)blur:(UIImage*)theImage
{
 CIContext *context = [CIContext contextWithOptions:nil];
 CIImage *inputImage = [CIImage imageWithCGImage:theImage.CGImage]; 

 CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
 [filter setValue:inputImage forKey:kCIInputImageKey];
 [filter setValue:[NSNumber numberWithFloat:15.0f] forKey:@"inputRadius"];
 CIImage *result = [filter valueForKey:kCIoUtputImageKey]; 

 CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]]; 

 UIImage *returnImage = [UIImage imageWithCGImage:cgImage];
 CGImageRelease(cgImage);
 return returnImage;
} 

- (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
 // Dispose of any resources that can be recreated.
} 

@end 

具体效果和参数自行研究吧！

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