iOS8
在iOS8中，Apple提供了一种新的实现方法UIBlurEffect。苹果也建议开发者使用这种方法，但如果你的项目需要支持iOS7，就不要考虑这种方法。
使用第三方
图像模糊的分类
先来看看原图
Snip20170612_10.png 使用三种方法进行高斯模糊处理。
直接上传代码
- (void)viewDidLoad {
[超级viewDidLoad];
UIImageView *imageView=[[UIImageView alloc] initWithFrame:self.view.bounds];
imageView.image=[UIImage imageNamed:@"flower.jpg"];
[self.view addSubview:imageView];
//iOS7
/*
typedef NS_ENUM(NSInteger, UIBarStyle) {
UIBarStyle默认=0,
UIBarStyleBlack=1,
UIBarStyleBlackOpaque=1, //已弃用。使用UIBarStyleBlack
UIBarStyleBlackTranslucent=2, //已弃用。使用UIBarStyleBlack 并将半透明属性设置为YES
}
*/
UIToolbar *toolbar=[[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, CGRectGetMaxX(self.view.frame), 200)];
工具栏.barStyle=UIBarStyleDefault;
[self.view addSubview:toolbar];
//iOS8
/*
typedef NS_ENUM(NSInteger, UIBlurEffectStyle) {
UIBlurEffectStyleExtraLight,
UIBlurEffectStyleLight,
UIBlurEffectStyleDark,
UIBlurEffectStyleExtraDark __TVOS_AVAILABLE(10_0) __IOS_PROHIBITED __WATCHOS_PROHIBITED,
UIBlurEffectStyleRegular NS_ENUM_AVAILABLE_IOS(10_0), //适应用户界面风格
UIBlurEffectStyleProminent NS_ENUM_AVAILABLE_IOS(10_0), //适应用户界面风格
}
*/
UIBlurEffect *blurEffect=[UIBlurEffecteffectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *effectView=[[UIVisualEffectView alloc] initWithEffect:blurEffect];
effectView.frame=CGRectMake(0, CGRectGetMaxY(self.view.frame) - 500, CGRectGetMaxX(self.view.frame), 200);
[self.view addSubview:effectView];
//第三者
UIImage *image=[[UIImage imageNamed:@"bottom"] applyLightEffect];
UIImageView *imageView2=[[UIImageView 分配] initWithFrame:CGRectMake(0, CGRectGetMaxY(self.view.frame) - 200, CGRectGetMaxX(self.view.frame), 200)];
imageView2.image=图像；
[self.view addSubview:imageView2];
}以上效果图（这里以光线为例）
截图20170612_11.png
还有其他几种枚举效果，有兴趣的话可以尝试一下。
附上第三方
/*
文件： UIImage+ImageEffects.m
Abstract: 这是UIImage 的一个类别，添加了对图像应用模糊和色调效果的方法。这是您需要查看的代码，以了解如何使用vImage 有效地计算模糊。
版本： 1.0
免责声明： 重要： 此Apple 软件由Apple 向您提供
Inc.（“Apple”）考虑到您同意以下内容
条款以及您的使用、安装、修改或重新分发
使用此Apple 软件即表示接受这些条款。如果你这样做
不同意这些条款，请不要使用、安装、修改或
重新分发此Apple 软件。
考虑到您同意遵守以下条款，并且
根据这些条款，Apple 授予您个人的、非排他性的
许可证，根据Apple 的原始Apple 软件版权（
“Apple 软件”），使用、复制、修改和重新分发Apple
软件，无论是否经过修改，均采用源代码和/或二进制形式；
前提是，如果您重新分发整个Apple 软件并且
未经修改，您必须保留本通知和以下内容
Apple 软件的所有此类重新分发中的文本和免责声明。
Apple Inc. 的名称、商标、服务标记或徽标均不得
用于认可或推广源自Apple 软件的产品
未经Apple 事先书面许可。除非作为
本通知中明确规定，没有其他权利或许可、明示或
Apple 在此授予暗示，包括但不限于任何
您的衍生作品或其他人可能侵犯的专利权
可能包含Apple 软件的作品。
Apple 软件由Apple 按“原样”提供。苹果
不作任何明示或暗示的保证，包括但不限于
非侵权、适销性和适用性的默示保证
出于特定目的，关于Apple 软件或其使用和
单独操作或与您的产品结合使用。
在任何情况下，Apple 均不对任何特殊、间接、附带的情况承担责任
或间接损害（包括但不限于采购
替代商品或服务；使用、数据或利润的损失；或商业
因使用、复制、
无论何种原因造成的Apple 软件修改和/或分发
以及是否根据合同理论、侵权行为（包括疏忽），
严格责任或其他情况，即使Apple 已被告知
发生此类损坏的可能性。
版权所有(C) 2013 Apple Inc. 保留所有权利。
版权所有 2013 Apple Inc. 保留所有权利。
WWDC 2013 许可证
注： 此Apple 软件由Apple 作为WWDC 2013 的一部分提供
会议。请参阅适用的WWDC 2013 会议了解更多信息
信息。
重要信息： 此Apple 软件由Apple Inc. 向您提供。
（“Apple”）考虑到您同意以下条款，并且
您对本Apple 的使用、安装、修改或重新分发
软件即表示接受这些条款。如果您不同意
这些条款，请不要使用、安装、修改或重新分发
苹果软件。
考虑到您同意遵守以下条款，并且
根据这些条款，Apple 授予您非独占许可，
Apple 对此原始Apple 软件的版权（“Apple
软件”），使用、复制、修改和重新分发Apple
软件，无论是否经过修改，均采用源代码和/或二进制形式；
前提是如果您重新分发整个Apple 软件并且
未经修改，您必须保留本通知和以下内容
Apple 软件的所有此类重新分发中的文本和免责声明。
Apple Inc. 的名称、商标、服务标记或徽标均不得
用于认可或推广源自Apple 软件的产品
未经Apple 事先书面许可。除非作为
本通知中明确规定，没有其他权利或许可、明示或
Apple 在此授予暗示，包括但不限于任何
您的衍生作品或其他人可能侵犯的专利权
可能包含Apple 软件的作品。
Apple 软件由Apple 按“原样”提供。苹果制造
不提供任何明示或暗示的保证，包括但不限于
非侵权、适销性和适用性的默示保证
特定目的，关于Apple 软件或其使用和
单独操作或与您的产品结合使用。
在任何情况下，Apple 均不对任何特殊、间接、附带的情况承担责任
或间接损害（包括但不限于采购
替代商品或服务；使用、数据或利润的损失；或商业
因使用、复制、
无论何种原因造成的Apple 软件修改和/或分发
以及是否根据合同理论、侵权行为（包括疏忽），
严格责任或其他情况，即使Apple 已被告知
发生此类损坏的可能性。
EA1002
2013年5月3日
*/
#import "UIImage+ImageEffects.h"
@导入加速；
#import@implementation UIImage（图像效果）
- (UIImage *)应用光效
{
UIColor *tintColor=[UIColor colorWithWhite:1.0 alpha:0.3];
返回[self applyBlurWithRadius:30 TintColor:tintColor SaturationDeltaFactor:1.8 maskImage:nil];
}
- (UIImage *)应用额外光效
{
UIColor *tintColor=[UIColor colorWithWhite:0.97 alpha:0.82];
返回[self applyBlurWithRadius:20 TintColor:tintColor SaturationDeltaFactor:1.8 maskImage:nil];
}
- (UIImage *)应用深色效果
{
UIColor *tintColor=[UIColor colorWithWhite:0.11 alpha:0.73];
返回[self applyBlurWithRadius:20 TintColor:tintColor SaturationDeltaFactor:1.8 maskImage:nil];
}
- (UIImage *)applyTintEffectWithColor:(UIColor *)tintColor
{
常量CGFloat EffectColorAlpha=0.6;
UIColor *effectColor=色调颜色；
int componentCount=CGColorGetNumberOfComponents(tintColor.CGColor);
if (组件计数==2) {
CGFloat b;
if ([tintColor getWhite:b alpha:NULL]) {
effectColor=[UIColor colorWithWhite:b alpha:EffectColorAlpha];
}
}
别的{
CGFloat r、g、b；
if ([tintColor getRed:r green:g blue:b alpha:NULL]) {
effectColor=[UIColor colorWithRed:r green:g blue:b alpha:EffectColorAlpha];
}
}
返回[self applyBlurWithRadius:10 TintColor:effectColor SaturationDeltaFactor:-1.0 maskImage:nil];
}
- (UIImage *)applyBlurWithRadius:(CGFloat)blurRadius twinColor:(UIColor *)tint颜色饱和度DeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage *)maskImage
{
//检查先决条件。
if (self.size.width 1 || self.size.height 1) {
NSLog(@"*** error: 无效的size: (%.2f x %.2f)。两个尺寸必须=1: %@", self.size.width, self.size.height, self);
返回零；
}
if (!self.CGImage) {
NSLog (@"*** error: 图像必须由CGImage: %@", self 支持);
返回零；
}
if (maskImage!maskImage.CGImage) {
NSLog (@"*** error: maskImage 必须由CGImage: %@", maskImage 支持);
返回零；
}
CGRect imageRect={ CGPointZero, self.size };
UIImage *effectImage=self;
BOOL hasBlur=blurRadius __FLT_EPSILON__;
BOOL hasSaturationChange=fabs(saturationDeltaFactor - 1.) __FLT_EPSILON__;
如果（hasBlur || hasSaturationChange）{
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] 比例]);
CGContextRefeffectInContext=UIGraphicsGetCurrentContext();
CGContextScaleCTM(effectInContext, 1.0, -1.0);
CGContextTranslateCTM(ef
fectInContext, 0, -self.size.height);
CGContextDrawImage(effectInContext, imageRect, self.CGImage);
vImage_Buffer effectInBuffer;
effectInBuffer.data = CGBitmapContextGetData(effectInContext);
effectInBuffer.width = CGBitmapContextGetWidth(effectInContext);
effectInBuffer.height = CGBitmapContextGetHeight(effectInContext);
effectInBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectInContext);
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
CGContextRef effectOutContext = UIGraphicsGetCurrentContext();
vImage_Buffer effectOutBuffer;
effectOutBuffer.data = CGBitmapContextGetData(effectOutContext);
effectOutBuffer.width = CGBitmapContextGetWidth(effectOutContext);
effectOutBuffer.height = CGBitmapContextGetHeight(effectOutContext);
effectOutBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectOutContext);
if (hasBlur) {
// A description of how to compute the box kernel width from the Gaussian
// radius (aka standard deviation) appears in the SVG spec:
// http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement
//
// For larger values of "s" (s >= 2.0), an approximation can be used: Three
// successive box-blurs build a piece-wise quadratic convolution kernel, which
// approximates the Gaussian kernel to within roughly 3%.
//
// let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)
//
// ... if d is odd, use three box-blurs of size "d", centered on the output pixel.
//
CGFloat inputRadius = blurRadius * [[UIScreen mainScreen] scale];
NSUInteger radius = floor(inputRadius * 3. * sqrt(2 * M_PI) / 4 + 0.5);
if (radius % 2 != 1) {
radius += 1; // force radius to be odd so that the three box-blur methodology works.
}
vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectOutBuffer, &effectInBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
}
BOOL effectImageBuffersAreSwapped = NO;
if (hasSaturationChange) {
CGFloat s = saturationDeltaFactor;
CGFloat floatingPointSaturationMatrix[] = {
0.0722 + 0.9278 * s, 0.0722 - 0.0722 * s, 0.0722 - 0.0722 * s, 0,
0.7152 - 0.7152 * s, 0.7152 + 0.2848 * s, 0.7152 - 0.7152 * s, 0,
0.2126 - 0.2126 * s, 0.2126 - 0.2126 * s, 0.2126 + 0.7873 * s, 0,
0, 0, 0, 1,
};
const int32_t divisor = 256;
NSUInteger matrixSize = sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);
int16_t saturationMatrix[matrixSize];
for (NSUInteger i = 0; i< matrixSize; ++i) {
saturationMatrix[i] = (int16_t)roundf(floatingPointSaturationMatrix[i] * divisor);
}
if (hasBlur) {
vImageMatrixMultiply_ARGB8888(&effectOutBuffer, &effectInBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
effectImageBuffersAreSwapped = YES;
}
else {
vImageMatrixMultiply_ARGB8888(&effectInBuffer, &effectOutBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
}
}
if (!effectImageBuffersAreSwapped)
effectImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
if (effectImageBuffersAreSwapped)
effectImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
// Set up output context.
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
CGContextRef outputContext = UIGraphicsGetCurrentContext();
CGContextScaleCTM(outputContext, 1.0, -1.0);
CGContextTranslateCTM(outputContext, 0, -self.size.height);
// Draw base image.
CGContextDrawImage(outputContext, imageRect, self.CGImage);
// Draw effect image.
if (hasBlur) {
CGContextSaveGState(outputContext);
if (maskImage) {
CGContextClipToMask(outputContext, imageRect, maskImage.CGImage);
}
CGContextDrawImage(outputContext, imageRect, effectImage.CGImage);
CGContextRestoreGState(outputContext);
}
// Add in color tint.
if (tintColor) {
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, tintColor.CGColor);
CGContextFillRect(outputContext, imageRect);
CGContextRestoreGState(outputContext);
}
// Output image is ready.
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outputImage;
}
@end/*
File: UIImage+ImageEffects.h
Abstract: This is a category of UIImage that adds methods to apply blur and tint effects to an image. This is the code you’ll want to look out to find out how to use vImage to efficiently calculate a blur.
Version: 1.0
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Inc. ("Apple") in consideration of your agreement to the following
terms, and your use, installation, modification or redistribution of
this Apple software constitutes acceptance of these terms. If you do
not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple"s copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
implied, are granted by Apple herein, including but not limited to any
patent rights that may be infringed by your derivative works or by other
works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2013 Apple Inc. All Rights Reserved.
Copyright © 2013 Apple Inc. All rights reserved.
WWDC 2013 License
NOTE: This Apple Software was supplied by Apple as part of a WWDC 2013
Session. Please refer to the applicable WWDC 2013 Session for further
information.
IMPORTANT: This Apple software is supplied to you by Apple Inc.
("Apple") in consideration of your agreement to the following terms, and
your use, installation, modification or redistribution of this Apple
software constitutes acceptance of these terms. If you do not agree with
these terms, please do not use, install, modify or redistribute this
Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a non-exclusive license, under
Apple"s copyrights in this original Apple software (the "Apple
Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
implied, are granted by Apple herein, including but not limited to any
patent rights that may be infringed by your derivative works or by other
works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES
NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
EA1002
5/3/2013
*/
@import UIKit;
@interface UIImage (ImageEffects)
- (UIImage *)applyLightEffect;
- (UIImage *)applyExtraLightEffect;
- (UIImage *)applyDarkEffect;
- (UIImage *)applyTintEffectWithColor:(UIColor *)tintColor;
- (UIImage *)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor *)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage *)maskImage;
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