iOS中图片的一些处理，磨砂，压缩，，

有时候，我们在进行上传图片，或是进行处理图片的时候会出现修改图片大小，进行压缩处理，这时候我们就会用到下面的方法
/**
* 图片压缩处理
*
* @param type 压缩类型（大中小）
*
* @return 压缩后的图片
*/
-(UIImage *) compressionImage:(NSInteger) type;

/**
* 修改图像尺寸并压缩大小
*
* @param image 图片
*
* @return 压缩后的图片
*/
+ (UIImage )scaleAndRotateImage:(UIImage )image;

/**
* 头像图片压缩
*
* @param image 图片
*
* @return 压缩后的图片
*/
+ (UIImage )scaleUserImage:(UIImage )image;

/**
* 将图片做磨砂处理
*
* @param blur 磨砂度
*
* @return
*/
- (UIImage *)blurryImageWithBlurLevel:(CGFloat)blur;
- 这是一个处理图片进行磨砂处理的样子

@implementation UIImage(Category)

/**
* 图片压缩处理
*
* @param type 压缩类型（大中小）
*
* @return 压缩后的图片
*/
-(UIImage *) compressionImage:(NSInteger) type {
CGFloat compressionQuality;
switch (type) {
case image_original:
case image_big:
compressionQuality = 1.0f;
break;
case image_middle:
compressionQuality = 0.8f;
break;
case image_small:
compressionQuality = 0.6f;
break;
default:
compressionQuality = 0;
break;
}
return [UIImage imageWithData:UIImageJPEGRepresentation(self, compressionQuality)];
}

/**
* 等比例压缩
*
* @param sourceImage
* @param size
*
* @return
*/
-(UIImage ) imageCompressForSize:(UIImage )sourceImage targetSize:(CGSize)size{
UIImage *newImage = nil;
CGSize imageSize = sourceImage.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;
CGFloat targetWidth = size.width;
CGFloat targetHeight = size.height;
CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetWidth;
CGFloat scaledHeight = targetHeight;
CGPoint thumbnailPoint = CGPointMake(0.0, 0.0);
if(CGSizeEqualToSize(imageSize, size) == NO){
CGFloat widthFactor = targetWidth / width;
CGFloat heightFactor = targetHeight / height;
if(widthFactor > heightFactor){
scaleFactor = widthFactor;
}
else{
scaleFactor = heightFactor;
}
scaledWidth = width * scaleFactor;
scaledHeight = height * scaleFactor;
if(widthFactor > heightFactor){
thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
}else if(widthFactor < heightFactor){
thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
}
}

UIGraphicsBeginImageContext(size);CGRect thumbnailRect = CGRectZero;thumbnailRect.origin = thumbnailPoint;thumbnailRect.size.width = scaledWidth;thumbnailRect.size.height = scaledHeight;[sourceImage drawInRect:thumbnailRect];newImage = UIGraphicsGetImageFromCurrentImageContext();if(newImage == nil){    NSLog(@"scale image fail");}UIGraphicsEndImageContext();return newImage;

}

/**
* 修改图像尺寸并压缩大小
*
* @param image 图片
*
* @return 压缩后的图片
*/
- (UIImage )scaleAndRotateImage:(UIImage )image {
CGSize imageSize = image.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;

CGFloat thumbSize = 0.8;CGFloat tempW = 480;if (width == 3264 || width == 2592) {    tempW = 1024;    thumbSize = 0.6;} else if (width == 2448 || width == 1936) {    tempW = 720;    thumbSize = 0.6;} else if (width <= 480) {    tempW = screenWidth;} else if (width > 480 && width <= 1024) {    tempW = width;} else if (width > 1024) {    tempW = 1024;}CGFloat scaleFactor = 0.0;CGPoint thumbPoint = CGPointMake(0.0,0.0);CGFloat widthFactor = tempW / width;CGFloat thumbHeight = tempW * (height/width);CGFloat heightFactor = thumbHeight / height;if (widthFactor > heightFactor)  {    scaleFactor = widthFactor;}else {    scaleFactor = heightFactor;}CGFloat scaledWidth  = width * scaleFactor;CGFloat scaledHeight = height * scaleFactor;if (widthFactor > heightFactor) {    thumbPoint.y = (thumbHeight - scaledHeight) * 0.5;} else if(widthFactor < heightFactor) {    thumbPoint.x = (tempW - scaledWidth) * 0.5;}UIGraphicsBeginImageContext(CGSizeMake(tempW, thumbHeight));CGRect thumbRect = CGRectZero;thumbRect.origin = thumbPoint;thumbRect.size.width  = scaledWidth;thumbRect.size.height = scaledHeight;[image drawInRect:thumbRect];UIImage *thumbImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();NSData *thumbImageData = UIImageJPEGRepresentation(thumbImage, thumbSize);CGFloat compressionQuality = thumbSize;while (thumbImageData.length > 280000 && compressionQuality > 0.5) {    thumbImageData = UIImageJPEGRepresentation(thumbImage, compressionQuality -= 0.1);}UIImage *aimage = [UIImage imageWithData: thumbImageData];return aimage;

}

/**
* 头像压缩
*
* @param image 图片
*
* @return 压缩后的图片
*/
+ (UIImage )scaleUserImage:(UIImage )image {
CGSize imageSize = image.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;

CGFloat thumbSize = 0.8;CGFloat tempW = width;if (width > 1024) {    tempW = 640;}CGFloat scaleFactor = 0.0;CGPoint thumbPoint = CGPointMake(0.0,0.0);CGFloat widthFactor = tempW / width;CGFloat thumbHeight = tempW * (height/width);CGFloat heightFactor = thumbHeight / height;if (widthFactor > heightFactor)  {    scaleFactor = widthFactor;}else {    scaleFactor = heightFactor;}CGFloat scaledWidth  = width * scaleFactor;CGFloat scaledHeight = height * scaleFactor;if (widthFactor > heightFactor) {    thumbPoint.y = (thumbHeight - scaledHeight) * 0.5;} else if(widthFactor < heightFactor) {    thumbPoint.x = (tempW - scaledWidth) * 0.5;}UIGraphicsBeginImageContext(CGSizeMake(tempW, thumbHeight));CGRect thumbRect = CGRectZero;thumbRect.origin = thumbPoint;thumbRect.size.width  = scaledWidth;thumbRect.size.height = scaledHeight;[image drawInRect:thumbRect];UIImage *thumbImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();NSData *thumbImageData = UIImageJPEGRepresentation(thumbImage, thumbSize);CGFloat compressionQuality = thumbSize;while (thumbImageData.length > 280000 && compressionQuality > 0.5) {    thumbImageData = UIImageJPEGRepresentation(thumbImage, compressionQuality -= 0.1);}UIImage *aimage = [UIImage imageWithData: thumbImageData];return aimage;

}

/**
* 将图片做磨砂处理
*
* @param blur 磨砂度
*
* @return
*/
- (UIImage *)blurryImageWithBlurLevel:(CGFloat)blur {
int boxSize = (int)(blur * 40);
boxSize = boxSize - (boxSize % 2) + 1;

CGImageRef img = self.CGImage;vImage_Buffer inBuffer, outBuffer;vImage_Error error;void *pixelBuffer;//create vImage_Buffer with data from CGImageRefCGDataProviderRef inProvider = CGImageGetDataProvider(img);CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);inBuffer.width = CGImageGetWidth(img);inBuffer.height = CGImageGetHeight(img);inBuffer.rowBytes = CGImageGetBytesPerRow(img);inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);//create vImage_Buffer for outputpixelBuffer = 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);//perform convolutionerror = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend)?: vImageBoxConvolve_ARGB8888(&outBuffer, &inBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend)?: 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,                                         (CGBitmapInfo)kCGImageAlphaNoneSkipLast);CGImageRef imageRef = CGBitmapContextCreateImage (ctx);UIImage *returnImage = [UIImage imageWithCGImage:imageRef];//clean upCGContextRelease(ctx);CGColorSpaceRelease(colorSpace);free(pixelBuffer);//free(pixelBuffer2);CFRelease(inBitmapData);CGImageRelease(imageRef);return returnImage;

}
但是要记得在实现的时候记得倒入两个框架
一#import

impor