UIImage 各种处理（分类）
2024-05-08 17:23:41
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];
}转载于:https://www.cnblogs.com/xuaninitial/p/6641551.html
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