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  • UIImage 各种处理（分类）

     1 @interface UIImage (conversion)
 2  
 3 //压缩图片到宽度1024
 4 + (UIImage *)imageCompressSizeToMin1024Width:(UIImage *)image;
 5  
 6  
 7 //修改图片size
 8 + (UIImage *)image:(UIImage *)image byScalingToSize:(CGSize)targetSize;
 9  
10 //UIColor 转UIImage
11 + (UIImage *)imageWithColor: (UIColor*) color;
12  
13 //图片转换成黑白(type1:灰 type2:橙 type3:蓝 other:不变)
14 + (UIImage *)grayscale:(UIImage*)anImage type:(int)type;
15  
16 //view转图片
17 +(UIImage *)getImageFromView:(UIView *)view;
18  
19 //图片转化成png
20 + (UIImage *)imageToPng:(UIImage *)image;
21  
22 //图片转换成jpg格式
23 + (UIImage *)imageToJpg:(UIImage *)image;
24  
25 //图片正向处理，相册读出来的图片有时候头不朝上
26 + (UIImage *)fixOrientation:(UIImage *)aImage;
27  
28 @end
    .h
      1 @implementation UIImage (conversion)
  2 
  3 + (UIImage *)imageCompressSizeToMin1024Width:(UIImage *)image {
  4     CGSize size = CGSizeZero;
  5     if (image.size.width>1024) {
  6         size.width = 1024;
  7         size.height = image.size.height*1024/image.size.width;
  8         image = [UIImage image:image byScalingToSize:size];
  9     }
 10     return image;
 11 }
 12 
 13 /**
 14  *  修改图片size
 15  *
 16  *  @param image      原图片
 17  *  @param targetSize 要修改的size
 18  *
 19  *  @return 修改后的图片
 20  */
 21 + (UIImage *)image:(UIImage*)image byScalingToSize:(CGSize)targetSize {
 22     UIImage *sourceImage = image;
 23     UIImage *newImage = nil;
 24     
 25     UIGraphicsBeginImageContext(targetSize);
 26     
 27     CGRect thumbnailRect = CGRectZero;
 28     thumbnailRect.origin = CGPointZero;
 29     thumbnailRect.size.width  = targetSize.width;
 30     thumbnailRect.size.height = targetSize.height;
 31     
 32     [sourceImage drawInRect:thumbnailRect];
 33     
 34     newImage = UIGraphicsGetImageFromCurrentImageContext();
 35     UIGraphicsEndImageContext();
 36     
 37     return newImage ;
 38 }
 39 
 40 //UIColor 转UIImage
 41 + (UIImage *)imageWithColor: (UIColor*) color
 42 {
 43     CGRect rect=CGRectMake(0,0, 1, 1);
 44     UIGraphicsBeginImageContext(rect.size);
 45     CGContextRef context = UIGraphicsGetCurrentContext();
 46     CGContextSetFillColorWithColor(context, [color CGColor]);
 47     CGContextFillRect(context, rect);
 48     UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
 49     UIGraphicsEndImageContext();
 50     return theImage;
 51 }
 52 
 53 //图片转换成黑白
 54 + (UIImage *)grayscale:(UIImage*)anImage type:(int)type {
 55     //先转换成png
 56     UIImage *pngImage = [UIImage imageToPng:anImage];
 57     
 58     CGImageRef imageRef = pngImage.CGImage;
 59     
 60     size_t width  = CGImageGetWidth(imageRef);
 61     size_t height = CGImageGetHeight(imageRef);
 62     
 63     size_t bitsPerComponent = CGImageGetBitsPerComponent(imageRef);
 64     size_t bitsPerPixel = CGImageGetBitsPerPixel(imageRef);
 65     
 66     size_t bytesPerRow = CGImageGetBytesPerRow(imageRef);
 67     
 68     CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);
 69     
 70     CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
 71     
 72     
 73     bool shouldInterpolate = CGImageGetShouldInterpolate(imageRef);
 74     
 75     CGColorRenderingIntent intent = CGImageGetRenderingIntent(imageRef);
 76     
 77     CGDataProviderRef dataProvider = CGImageGetDataProvider(imageRef);
 78     
 79     CFDataRef data = CGDataProviderCopyData(dataProvider);
 80     
 81     UInt8 *buffer = (UInt8*)CFDataGetBytePtr(data);
 82     
 83     NSUInteger  x, y;
 84     for (y = 0; y < height; y++) {
 85         for (x = 0; x < width; x++) {
 86             UInt8 *tmp;
 87             tmp = buffer + y * bytesPerRow + x * 4;
 88             
 89             UInt8 red,green,blue;
 90             red = *(tmp + 0);
 91             green = *(tmp + 1);
 92             blue = *(tmp + 2);
 93             
 94             UInt8 brightness;
 95             switch (type) {
 96                 case 1:
 97                     brightness = (77 * red + 28 * green + 151 * blue) / 256;
 98                     *(tmp + 0) = brightness;
 99                     *(tmp + 1) = brightness;
100                     *(tmp + 2) = brightness;
101                     break;
102                 case 2:
103                     *(tmp + 0) = red;
104                     *(tmp + 1) = green * 0.7;
105                     *(tmp + 2) = blue * 0.4;
106                     break;
107                 case 3:
108                     *(tmp + 0) = 255 - red;
109                     *(tmp + 1) = 255 - green;
110                     *(tmp + 2) = 255 - blue;
111                     break;
112                 default:
113                     *(tmp + 0) = red;
114                     *(tmp + 1) = green;
115                     *(tmp + 2) = blue;
116                     break;
117             }
118         }
119     }
120     CFDataRef effectedData = CFDataCreate(NULL, buffer, CFDataGetLength(data));
121     CGDataProviderRef effectedDataProvider = CGDataProviderCreateWithCFData(effectedData);
122     CGImageRef effectedCgImage = CGImageCreate(width, height,
123                                                bitsPerComponent, bitsPerPixel, bytesPerRow,
124                                                colorSpace, bitmapInfo, effectedDataProvider,
125                                                NULL, shouldInterpolate, intent);
126     UIImage *effectedImage = [[UIImage alloc] initWithCGImage:effectedCgImage];
127     CGImageRelease(effectedCgImage);
128     CFRelease(effectedDataProvider);
129     CFRelease(effectedData);
130     CFRelease(data);
131     
132     return effectedImage;
133     
134 }
135 
136 //view转图片
137 + (UIImage *)getImageFromView:(UIView *)view{
138     
139     UIGraphicsBeginImageContext(view.bounds.size);
140     [view.layer renderInContext:UIGraphicsGetCurrentContext()];
141     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
142     UIGraphicsEndImageContext();
143     return image;
144 }
145 
146 //图片转换成png格式
147 + (UIImage *)imageToPng:(UIImage *)image {
148     //我们需要将其转换成NSdata二进制存储，
149     NSData *data;
150     if (UIImagePNGRepresentation(image) == nil) {
151         data = UIImageJPEGRepresentation(image, 1);
152     } else {
153         data = UIImagePNGRepresentation(image);
154     }
155     NSFileManager *fileManager = [NSFileManager defaultManager];
156     NSString *sandPath = NSHomeDirectory();
157     //文件路径
158     NSString *path = [sandPath stringByAppendingPathComponent:@"tmp/image.png"];
159     //    DLog(@"%@",path);
160     [fileManager createFileAtPath:path contents:data attributes:nil];   // 将图片保存为PNG格式
161     [data writeToFile:path atomically:YES];
162     UIImage *pngImage = [UIImage imageWithContentsOfFile:path];
163     return pngImage;
164 }
165 
166 //图片转换成jpg格式
167 + (UIImage *)imageToJpg:(UIImage *)image {
168     //我们需要将其转换成NSdata二进制存储，
169     NSData *data;
170     if (UIImagePNGRepresentation(image) == nil) {
171         data = UIImageJPEGRepresentation(image, 1);
172     } else {
173         data = UIImagePNGRepresentation(image);
174     }
175     
176     NSFileManager *fileManager = [NSFileManager defaultManager];
177     NSString *sandPath = NSHomeDirectory();
178     //文件路径
179     NSString *path = [sandPath stringByAppendingPathComponent:@"tmp/image.jpg"];
180     [fileManager createFileAtPath:path contents:data attributes:nil];   // 将图片保存为JPG格式
181     [data writeToFile:path atomically:YES];
182     
183     UIImage *jpgImage = [UIImage imageWithContentsOfFile:path];
184     
185     return jpgImage;
186 }
187 
188 //正向处理
189 + (UIImage *)fixOrientation:(UIImage *)aImage {
190     
191     // No-op if the orientation is already correct
192     if (aImage.imageOrientation ==UIImageOrientationUp)
193         return aImage;
194     
195     // We need to calculate the proper transformation to make the image upright.
196     // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
197     CGAffineTransform transform =CGAffineTransformIdentity;
198     
199     switch (aImage.imageOrientation) {
200         case UIImageOrientationDown:
201         case UIImageOrientationDownMirrored:
202             transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
203             transform = CGAffineTransformRotate(transform, M_PI);
204             break;
205             
206         case UIImageOrientationLeft:
207         case UIImageOrientationLeftMirrored:
208             transform = CGAffineTransformTranslate(transform, aImage.size.width,0);
209             transform = CGAffineTransformRotate(transform, M_PI_2);
210             break;
211             
212         case UIImageOrientationRight:
213         case UIImageOrientationRightMirrored:
214             transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
215             transform = CGAffineTransformRotate(transform, -M_PI_2);
216             break;
217         default:
218             break;
219     }
220     
221     switch (aImage.imageOrientation) {
222         case UIImageOrientationUpMirrored:
223         case UIImageOrientationDownMirrored:
224             transform = CGAffineTransformTranslate(transform, aImage.size.width,0);
225             transform = CGAffineTransformScale(transform, -1, 1);
226             break;
227             
228         case UIImageOrientationLeftMirrored:
229         case UIImageOrientationRightMirrored:
230             transform = CGAffineTransformTranslate(transform, aImage.size.height,0);
231             transform = CGAffineTransformScale(transform, -1, 1);
232             break;
233         default:
234             break;
235     }
236     
237     // Now we draw the underlying CGImage into a new context, applying the transform
238     // calculated above.
239     CGContextRef ctx =CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
240                                             CGImageGetBitsPerComponent(aImage.CGImage),0,
241                                             CGImageGetColorSpace(aImage.CGImage),
242                                             CGImageGetBitmapInfo(aImage.CGImage));
243     CGContextConcatCTM(ctx, transform);
244     switch (aImage.imageOrientation) {
245         case UIImageOrientationLeft:
246         case UIImageOrientationLeftMirrored:
247         case UIImageOrientationRight:
248         case UIImageOrientationRightMirrored:
249             // Grr...
250             CGContextDrawImage(ctx,CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
251             break;
252             
253         default:
254             CGContextDrawImage(ctx,CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
255             break;
256     }
257     
258     // And now we just create a new UIImage from the drawing context
259     CGImageRef cgimg =CGBitmapContextCreateImage(ctx);
260     UIImage *img = [UIImage imageWithCGImage:cgimg];
261     CGContextRelease(ctx);
262     CGImageRelease(cgimg);
263     return img;
264 }
265 
266 @end
    .m

    mark -- 1. 对照片做处理的时候 先旋转方向   再改变格式 

    　　　　2.如果拍设的照片太大的话上传后台估计会出错

    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {
    UIImage *originalImage = (UIImage *)[info objectForKey:UIImagePickerControllerEditedImage];
    if (!originalImage) {
        originalImage = (UIImage *)[info objectForKey:UIImagePickerControllerOriginalImage];
    }
    UIImage *imga = [UIImage fixOrientation:originalImage];//图片正向处理
    UIImage *img = [UIImage imageToJpg:imga];//转换成jpg
    
    
        NSData *imageData = UIImageJPEGRepresentation(img, 1);
        if  (imageData.length>300000){
            UIImage *image = [UIImage imageWithData:imageData];
            imageData = UIImageJPEGRepresentation(image, 0.005);
        }
   NSString *encodedImageStr = [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
    
    [picker dismissViewControllerAnimated:YES completion:nil];
}
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  • 原文地址：https://www.cnblogs.com/xuaninitial/p/6641551.html
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