如何将从 UIImagePickerViewController 中选择的图像路径保存到 sqlite 数据库并稍后访问它？ IOS

Posted 2023-03-15

【中文标题】如何将从 UIImagePickerViewController 中选择的图像路径保存到 sqlite 数据库并稍后访问它？ IOS

【英文标题】：How to save path of image picked from UIImagePickerViewController to sqlite database and access it later ? ios

【发布时间】：2013-01-17 11:58:18

【问题描述】：

我需要保存从服务器选择的图像的路径，然后访问该路径以通过数据库检索在用户单击时显示该图像。

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

      NSString *urlPath =  [info objectForKey:@"UIImagePickerControllerReferenceURL"]absoluteString];

并将其保存到数据库。

它保存为 assets-library://asset/asset.JPG?id=E1136225-97DE-4BF4-A864-67E33D60737A&ext=JPG

那我要导入到Imageview

 UIImageView *iv = [[UIImageView alloc]init];
 iv.image = [UIimage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imagepath]]];

但它不起作用

【参考方案1】：

试试这个：

  typedef void (^ALAssetsLibraryAssetForURLResultBlock)(ALAsset *asset);
    typedef void (^ALAssetsLibraryAccessFailureBlock)(NSError *error);    

    ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)

     ALAssetRepresentation *rep = [myasset defaultRepresentation];
     CGImageRef iref = [rep fullResolutionImage];

     if (iref)

            UIImage *myImage = [UIImage imageWithCGImage:iref scale:[rep scale] orientation:(UIImageOrientation)[rep orientation]];
            [fileImage addObject:myImage];

                   
    ;      

    ALAssetsLibraryAccessFailureBlock failureblock  = ^(NSError *myerror)

         //failed to get image.
    ;                          

    ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
    [assetslibrary assetForURL:[filePath objectAtIndex:0] resultBlock:resultblock failureBlock:failureblock];

注意：确保您的 [filePath objectAtIndex:0] 是 NSUrl 对象。否则将其转换为NSUrl

例子：

ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];

NSURL myAssetUrl = [NSURL URLWithString:[filePath objectAtIndex:0]];

assetslibrary assetForURL:myAssetUrl resultBlock:resultblock failureBlock:failureblock];

【参考方案2】：

使用 ALAssetsLibrary 类的assetForURL:resultBlock:failureBlock: 方法通过 URL 检索图像。 还有更多信息：http://developer.apple.com/library/ios/#documentation/AssetsLibrary/Reference/ALAssetsLibrary_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40009722

更新：

ALAssetsLibrary *lib = [[ALAssetsLibrary alloc] init];
[lib assetForURL: url resultBlock: ^(ALAsset *asset) 
    ALAssetRepresentation *r = [asset defaultRepresentation];
    self.imgView.image = [UIImage imageWithCGImage: r.fullResolutionImage];

    failureBlock: nil];

url 在哪里是您的缓存网址