iOS实现毛玻璃效果(无需要第三方)

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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