如何从照片库获取上一张照片的路径？

Question

i'm using this method to take screen capture :

    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage*theImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(theImage, nil, nil, nil);

and i want to get path for that photo so i can use it with Instagram methods

  NSURL *igImageHookFile = [[NSURL alloc] initWithString:[[NSString alloc] initWithFormat:@"file://%@", lastphotoTaken]];
//    NSURL *igImageHookFile = [[NSURL alloc] initWithString:[[NSString alloc] initWithFormat:@"file://%@", lastphotoTaken]];

self.dic.UTI = @"com.instagram.exclusivegram";
self.dic = [self setupControllerWithURL:igImageHookFile usingDelegate:self];
self.dic=[UIDocumentInteractionController interactionControllerWithURL:igImageHookFile];
self.dic.annotation = [NSDictionary dictionaryWithObject:@"Here Give what you want to share" forKey:@"InstagramCaption"];
[self.dic presentOpenInMenuFromRect: rect    inView: self.view animated: YES ];

thanx

Answer 1

There is no way to get the asset url using:

UIImageWriteToSavedPhotosAlbum(theImage, nil, nil, nil);

Instead you can use:

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

[library writeImageToSavedPhotosAlbum:[theImageCGImage] orientation:(ALAssetOrientation)[theImageimageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){  
    if (error)
    {  
        NSLog(@"Ooops!");  
    }
    else
    {  
        NSLog(@"Saved URL : %@", assetURL);  
    }  
}];  
[library release];