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//
// KWMImageBlurUtil.m
// iCemarose
//
// Created by HouWeiBin on 2017/4/28.
// Copyright © 2017年 kollway. All rights reserved.
//
//高斯模糊工具类
#import "KWMImageBlurUtil.h"
@implementation KWMImageBlurUtil
+(UIImage *)getBlurImage:(UIView *)view{
//1、开启上下文
UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);
//2.获取当前上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
//3.截屏
[view.layer renderInContext:ctx];
//4、获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
//废弃方法，该方法会需要1-2秒，不建议使用
+(UIImage *)startBlur:(UIImage *)image withBlurNumber:(CGFloat)blur{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage= [CIImage imageWithCGImage:image.CGImage];
//设置filter
CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
[filter setValue:inputImage forKey:kCIInputImageKey];
[filter setValue:@(blur) forKey: @"inputRadius"];
//模糊图片
CIImage *result=[filter valueForKey:kCIOutputImageKey];
CGImageRef outImage=[context createCGImage:result fromRect:[result extent]];
UIImage *blurImage=[UIImage imageWithCGImage:outImage];
CGImageRelease(outImage);
return blurImage;
}
@end