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！
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
