为了让界面更加美观，有时候我们需要将图片设置成模糊，比如下边这张图片：
这篇文章主要演示了三种模糊效果，如下：
一、简单的毛玻璃效果：
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原图
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毛玻璃效果
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代码如下：
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#import "ViewController.h"
#import <CoreImage/CoreImage.h>
@interface ViewController ()
@property (nonatomic, strong) UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.imageView = [[UIImageView alloc]initWithFrame:self.view.frame];
self.imageView.image = [UIImage imageNamed:@"1.jpg"];
self.imageView.contentMode = UIViewContentModeScaleAspectFill;
[self.view addSubview:self.imageView];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, self.view.frame.size.height - 80, self.view.frame.size.width, 40);
[button setTitle:@"蒙奇·D·路飞" forState:UIControlStateNormal];
button.backgroundColor = [UIColor brownColor];
[button addTarget:self action:@selector("点击调用的方法") forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
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button 被点击时调用以下代码：
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self.imageView = [[UIImageView alloc] initWithFrame:self.view.frame];
self.imageView.image = [UIImage imageNamed:@"1.jpg"];
UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blur];
visualEffectView.frame = self.view.frame;
[self.imageView addSubview:visualEffectView];
UIVibrancyEffect *vibrancyEffect = [UIVibrancyEffect effectForBlurEffect:blur];
UIVisualEffectView *ano = [[UIVisualEffectView alloc] initWithEffect:vibrancyEffect];
ano.frame = self.view.frame;
UILabel *label = [[UILabel alloc] init];
label.font = [UIFont systemFontOfSize:40];
label.frame = CGRectMake(0, self.view.frame.size.height - 120, self.view.frame.size.width, 80);
label.textAlignment = NSTextAlignmentCenter;
label.text = @"蒙奇·D·路飞";
[visualEffectView.contentView addSubview:ano];
[ano.contentView addSubview:label];
[self.view addSubview:self.imageView];
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二、高斯模糊运动模糊等，先看效果图：
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运动模糊效果图
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代码如下
viewDidLoad 中的代码和“简单的毛玻璃效果”中的 viewDidLoad 是一样的，这里只简单贴出 button 被点击调用的代码
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CIImage *inputImage = [CIImage imageWithCGImage:self.imageView.image.CGImage];
// CIGaussianBlur 高斯模糊
// CIBoxBlur 均值模糊
// CIDiscBlur 环形卷积模糊
// CIMotionBlur 运动模糊
CIFilter *filter = [CIFilter filterWithName:@"CIMotionBlur"];
[filter setValue:inputImage forKey:kCIInputImageKey];
[filter setValue:@5 forKey:kCIInputRadiusKey];
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *outupImage = filter.outputImage;
CGImageRef imageRef = [context createCGImage:outupImage fromRect:outupImage.extent];
self.imageView.image= [UIImage imageWithCGImage:imageRef];
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三、滤镜效果，先看下效果图
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原图
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“怀旧”效果图
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代码如下
viewDidLoad 中的代码和“简单的毛玻璃效果”中的 viewDidLoad 是一样的，这里也只贴出 button 被点击调用的代码
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CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:self.imageView.image];
// 怀旧 CIPhotoEffectInstant
// 单色 CIPhotoEffectMono
// 黑白 CIPhotoEffectNoir
// 褪色 CIPhotoEffectFade
// 色调 CIPhotoEffectTonal
// 冲印 CIPhotoEffectProcess
// 岁月 CIPhotoEffectTransfer
// 铬黄 CIPhotoEffectChrome
CIFilter *filter = [CIFilter filterWithName:@"CIPhotoEffectInstant"];
[filter setValue:inputImage forKey:kCIInputImageKey];
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
self.imageView.image= [UIImage imageWithCGImage:resultImage.CGImage];
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这是今晚整理的 CoreImage 相关的知识，如果哪里写的有问题，欢迎大家指正！另外给大家分享一篇文章，里面有很多 iOS 9 出来的 Core Image新滤镜，在这里。