iOS图片模糊效果的实现方法

本文为大家分享了iOS图片模糊效果的三种实现方式，供大家参考，具体内容如下
1.实现效果依次如图：原图、iOS8效果、Core Image效果、 VImage 效果
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2. 代码
#import "ViewController.h" #import <Accelerate/Accelerate.h>@interface ViewController （）@end@implementation ViewController- （void）viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"background"]]; // [self iOS8BlurImageImplement]; // [self coreImageImplement];[self vImageImplement]; }// iOS8 使用系统自带的处理方式 - （void）iOS8BlurImageImplement {UIBlurEffect *beffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];UIVisualEffectView *view = [[UIVisualEffectView alloc] initWithEffect:beffect];view.frame = self.view.bounds;[self.view addSubview:view]; } // 使用CoreImage实现图片模糊 - （void）coreImageImplement{CIContext *context = [CIContext contextWithOptions:nil];NSError *error = nil;NSString *filePath = [[NSBundle mainBundle] pathForResource:@"background" ofType:@"png"];NSData *imageData = [NSData dataWithContentsOfFile:filePath options:NSDataReadingUncached error:&error];//NSData *imageData = [NSData dataWithContentsOfFile:@"background.png"];CIImage *image = [CIImage imageWithData:imageData];CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];[filter setValue:image forKey:kCIInputImageKey];[filter setValue:@2.0f forKey:@"inputRadius"];CIImage *result = [filter valueForKey:kCIOutputImageKey];CGImageRef outImage = [context createCGImage:result fromRect:[result extent]];UIImage *bluerImage = [UIImage imageWithCGImage:outImage];UIImageView *imageView = [[UIImageView alloc] initWithImage:bluerImage];imageView.frame = self.view.bounds;[self.view addSubview:imageView]; } // 使用vImage API实现图片模糊 // iOS5.0中新增了vImage API可以使用，它属于Accelerate.Framework，所以如果你要使用它要在工程中加入这个Framework。模糊算法使用的是vImageBoxConvolve_ARGB8888这个函数。 - （void）vImageImplement {UIImage *image = [UIImage imageNamed:@"background"];UIImage *blurImage = [self blurryImage:image withBlurLevel:0.5];self.view.backgroundColor = [UIColor colorWithPatternImage:blurImage]; }- （UIImage *）blurryImage:（UIImage *）image withBlurLevel:（CGFloat）blur {if （blur < 0.f || blur > 1.f） { blur = 0.5f;}int boxSize = （int）（blur * 100）;boxSize = boxSize - （boxSize % 2） + 1;CGImageRef img = image.CGImage;vImage_Buffer inBuffer, outBuffer;vImage_Error error;voidvoid *pixelBuffer;CGDataProviderRef inProvider = CGImageGetDataProvider（img）;CFDataRef inBitmapData = CGDataProviderCopyData（inProvider）;inBuffer.width = CGImageGetWidth（img）;inBuffer.height = CGImageGetHeight（img）;inBuffer.rowBytes = CGImageGetBytesPerRow（img）;inBuffer.data = （void*）CFDataGetBytePtr（inBitmapData）;pixelBuffer = malloc（CGImageGetBytesPerRow（img） *CGImageGetHeight（img））;if（pixelBuffer == NULL） NSLog（@"No pixelbuffer"）;outBuffer.data = pixelBuffer;outBuffer.width = CGImageGetWidth（img）;outBuffer.height = CGImageGetHeight（img）;outBuffer.rowBytes = CGImageGetBytesPerRow（img）;error = vImageBoxConvolve_ARGB8888（&inBuffer, &outBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend）;if （error） { NSLog（@"error from convolution %ld", error）;}CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB（）;CGContextRef ctx = CGBitmapContextCreate（ outBuffer.data, outBuffer.width, outBuffer.height, 8, outBuffer.rowBytes, colorSpace, kCGImageAlphaNoneSkipLast）;CGImageRef imageRef = CGBitmapContextCreateImage （ctx）;UIImage *returnImage = [UIImage imageWithCGImage:imageRef];//clean upCGContextRelease（ctx）;CGColorSpaceRelease（colorSpace）;free（pixelBuffer）;CFRelease（inBitmapData）;CGColorSpaceRelease（colorSpace）;CGImageRelease（imageRef）;return returnImage; }@end
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脚本之家。