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问题:

I used

  `NSURL *urlA = [info valueForKey:@"PHImageFileURLKey"];`

but when i try to save image using URL then URL is nil.

 `NSData *pngData =[NSData dataWithContentsOfURL:urlA options:NSDataReadingMapped error:nil];`

回答1:

asset = Here you have to pass your PHAsset .

PHImageRequestOptions * imageRequestOptions = [[PHImageRequestOptions alloc] init];  [[PHImageManager defaultManager]              requestImageDataForAsset:asset                             options:imageRequestOptions                       resultHandler:^(NSData *imageData, NSString *dataUTI,                                       UIImageOrientation orientation,                                        NSDictionary *info)       {           NSLog(@"info = %@", info);           if ([info objectForKey:@"PHImageFileURLKey"]) {                 NSURL *path = [info objectForKey:@"PHImageFileURLKey"];                // if you want to save image in document see this.                [self saveimageindocument:imageData withimagename:[NSString stringWithFormat:@"DEMO"]];           }                                                 }];  -(void) saveimageindocument:(NSData*) imageData withimagename:(NSString*)imagename{      NSString *writePath = [NSString stringWithFormat:@"%@/%@.png",[Utility getDocumentDirectory],imagename];      if (![imageData writeToFile:writePath atomically:YES]) {         // failure         NSLog(@"image save failed to path %@", writePath);      } else {         // success.         NSLog(@"image save Successfully to path %@", writePath);     }  } + (NSString*)getDocumentDirectory {     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);     return [paths objectAtIndex:0]; }

Check image that landscape mode or portrait mode

if (chooseimage.size.height >= chooseimage.size.width) {          Islandscape = NO; }else{      UIImage* landscapeImage = [UIImage imageWithCGImage:chooseimage.CGImage                                                       scale:chooseimage.scale                                                 orientation:UIImageOrientationLeft];         self.imgPreviewView.image = landscapeImage;         self.imgPreviewView.contentMode = UIViewContentModeScaleAspectFill;         Islandscape = YES;  }

Add this permission into info.plist file

<key>NSPhotoLibraryUsageDescription</key> <string>$(PRODUCT_NAME) would like to access your photo library to let you select a picture.</string>

回答2:

You can get the imageURL from PHContentEditingInput:

Swift:

asset.requestContentEditingInput(with: PHContentEditingInputRequestOptions()) { (eidtingInput, info) in   if let input = eidtingInput, let imgURL = input.fullSizeImageURL {      // imgURL    } }

Objective-C:

[asset requestContentEditingInputWithOptions:[PHContentEditingInputRequestOptions new] completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {     NSURL *imageURL = contentEditingInput.fullSizeImageURL; }];

文章来源: How To get Image URL From PHAsset? Is it possible To save Image using PHAsset URL to document Directory?

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