/load user image - (void)UesrImageClicked { UIActionSheet *sheet; // 判斷是否支持相機 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { sheet = [[UIActionSheet alloc] initWithTitle:@"選擇圖像" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"拍照", @"從相冊選擇", nil]; } else { sheet = [[UIActionSheet alloc] initWithTitle:@"選擇圖像" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"從相冊選擇", nil]; } sheet.tag = 255; [sheet showInView:self.view]; } #pragma mark - action sheet delegte - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex { if (actionSheet.tag == 255) { NSUInteger sourceType = UIImagePickerControllerSourceTypePhotoLibrary; // 判斷是否支持相機 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { switch (buttonIndex) { case 0: return; case 1: //相機 sourceType = UIImagePickerControllerSourceTypeCamera; break; case 2: //相冊 sourceType = UIImagePickerControllerSourceTypePhotoLibrary; break; } } else { if (buttonIndex == 0) { return; } else { sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; } } // 跳轉到相機或相冊頁面 UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init]; imagePickerController.delegate = self; imagePickerController.allowsEditing = YES; imagePickerController.sourceType = sourceType; [self presentViewController:imagePickerController animated:YES completion:^{}]; } } #pragma mark - image picker delegte - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { [picker dismissViewControllerAnimated:YES completion:^{}]; UIImage *image = [info UIImagePickerControllerOriginalImage]; userImageView.image = image; NSData *imageData = UIImageJPEGRepresentation(image, COMPRESSED_RATE); UIImage *compressedImage = [UIImage imageWithData:imageData]; [HttpRequestManager uploadImage:compressedImage httpClient:self.httpClient delegate:self]; } //load user image - (void)UesrImageClicked {UIActionSheet *sheet;// 判斷是否支持相機if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){sheet = [[UIActionSheet alloc] initWithTitle:@"選擇圖像" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"拍照", @"從相冊選擇", nil];}else {sheet = [[UIActionSheet alloc] initWithTitle:@"選擇圖像" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"從相冊選擇", nil];}sheet.tag = 255;[sheet showInView:self.view]; }#pragma mark - action sheet delegte - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {if (actionSheet.tag == 255) {NSUInteger sourceType = UIImagePickerControllerSourceTypePhotoLibrary;// 判斷是否支持相機if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {switch (buttonIndex) {case 0:return;case 1: //相機sourceType = UIImagePickerControllerSourceTypeCamera;break;case 2: //相冊sourceType = UIImagePickerControllerSourceTypePhotoLibrary;break;}}else {if (buttonIndex == 0) {return;} else {sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;}}// 跳轉到相機或相冊頁面UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];imagePickerController.delegate = self;imagePickerController.allowsEditing = YES;imagePickerController.sourceType = sourceType;[self presentViewController:imagePickerController animated:YES completion:^{}];} }#pragma mark - image picker delegte - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {[picker dismissViewControllerAnimated:YES completion:^{}];UIImage *image = [info UIImagePickerControllerOriginalImage]; userImageView.image = image;NSData *imageData = UIImageJPEGRepresentation(image, COMPRESSED_RATE);UIImage *compressedImage = [UIImage imageWithData:imageData];[HttpRequestManager uploadImage:compressedImage httpClient:self.httpClient delegate:self];}

?

返回的圖像并不是正方形，顯示在用戶頭像的View里面產生明顯的拉伸。研究了很久各種裁剪算法，甚至想創建一個view來處理。突然發現代碼中從相機、相冊獲取圖片時采用的的

UIImagePickerControllerOriginalImage

于是跟蹤進去一看：

UIKIT_EXTERN NSString *const UIImagePickerControllerMediaType;????? // an NSString (UTI, i.e. kUTTypeImage)

UIKIT_EXTERN NSString *const UIImagePickerControllerOriginalImage;? // a UIImage

UIKIT_EXTERN NSString *const UIImagePickerControllerEditedImage;??? // a UIImage

UIKIT_EXTERN NSString *const UIImagePickerControllerCropRect;?????? // an NSValue (CGRect)

UIKIT_EXTERN NSString *const UIImagePickerControllerMediaURL;?????? // an NSURL

UIKIT_EXTERN NSString *const UIImagePickerControllerReferenceURL??????? NS_AVAILABLE_IOS(4_1);? // an NSURL that references an

?

將 UIImagePickerControllerOriginalImage 改為UIImagePickerControllerEditedImage，萬事搞定。

轉載于:https://www.cnblogs.com/muyilang/p/5218089.html

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