iphone - UIImage 在 iPhone 上保存带有文件名的图像

Question

如何使用我选择的文件名将图像（如使用 UIImageWriteToSavedPhotosAlbum() 方法）保存到 private/var 文件夹？

Answer 1

肯尼，你有答案！为了说明，我一直认为代码更有帮助。

//I do this in the didFinishPickingImage:(UIImage *)img method

NSData* imageData = UIImageJPEGRepresentation(img, 1.0);


//save to the default 100Apple(Camera Roll) folder.   

[imageData writeToFile:@"/private/var/mobile/Media/DCIM/100APPLE/customImageFilename.jpg" atomically:NO]; 

Answer 2

UIImageWriteToSavedPhotosAlbum()仅用于保存到照片相机胶卷。要保存到自定义文件夹，您需要使用UIImageJPEGRepresentation()或将 UIImage 转换为 NSData UIImagePNGRepresentation()，然后将此 NSData 保存到您喜欢的任何位置。

Answer 3

您可以使用下面的代码，而不使用 ALAssetsLibrary ...

NSString *fileName;

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissViewControllerAnimated:YES completion:^{

if( [picker sourceType] == UIImagePickerControllerSourceTypeCamera )
            {
                UIImageWriteToSavedPhotosAlbum(image,nil, nil, nil);
                [self performSelector:@selector(GetImageName) withObject:nil afterDelay:0.5];
            }
            else
            {
                NSURL *refURL = [info valueForKey:UIImagePickerControllerReferenceURL];
                PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[refURL] options:nil];
                fileName = [[result firstObject] filename];
            }
}];

-(void)GetImageName
{
 NSString *str =@"";
 PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
 fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
 PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];

if (fetchResult != nil && fetchResult.count > 0) {

    str = [[fetchResult lastObject] filename];
}

fileName = str;
}