UIDocumentPickerViewController使用

場景：從服務端下載文件到iPhone文件夾或者從iPhone本地文件夾選擇文件上傳服務端

UIDocumentPickerViewController有四種模式：

typedef NS_ENUM(NSUInteger, UIDocumentPickerMode) {
    UIDocumentPickerModeImport,
    UIDocumentPickerModeOpen,
    UIDocumentPickerModeExportToService,
    UIDocumentPickerModeMoveToService
} API_DEPRECATED("Use appropriate initializers instead",ios(8.0,14.0)) API_UNAVAILABLE(tvos);

• UIDocumentPickerModeImport：用戶選擇一個外部文檔，文檔選擇器拷貝該文檔到應用沙盒，不會修改源文檔。
• UIDocumentPickerModeOpen：打開一個外部文檔，用戶可以修改該文檔。
• UIDocumentPickerModeExportToService：文檔選擇器拷貝文檔到一個外部路徑，不會修改源文檔。
• UIDocumentPickerModeMoveToService：拷貝文檔到外部路徑，同時可以修改該拷貝。

1、下載文件存儲到iPhone 本地文件夾

-(void)requestImageUrl:(NSString *)imageUrl {
    [[DDLoading shared] show];
  
//     // 下載圖片之前先檢查本地是否已經有圖片
//     UIImage * image = [self loadLocalImage:imageUrl];
//     NSData *imageData = UIImagePNGRepresentation(image);
//     //如果圖片存在直接跳出；不用下載了
//     if (imageData) {
//       self.successBlock(imageData);
//       return;
//     }
   
   // 沒有本地圖片
   // 創建URL對象
//    NSURL *url = [NSURL URLWithString:[imageUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
      NSURL *url = [NSURL URLWithString:[imageUrl stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]];
   // 創建request對象
   NSURLRequest *request = [NSURLRequest requestWithURL:url];
   
   // 使用URLSession來進行網絡請求
   // 創建會話配置對象
   NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
   // 創建會話對象
   NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration];
   // 創建會話任務對象
   NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        if (data) {
            // 將下載的數據傳出去，進行UI更新
            DebugLog(@"文件下載成功~~~~~~%@",data);
                // 下載完成，將圖片保存到本地
                [data writeToFile:[self imageFilePath:imageUrl] atomically:YES];
        
                dispatch_async(dispatch_get_main_queue(), ^{
                     //遮罩關閉
                    NSString * urlPath =[self imageFilePath:imageUrl] ;
                    UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc] initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"file://%@",urlPath]] inMode:UIDocumentPickerModeExportToService];
                       documentPicker.delegate = self;
                       documentPicker.modalPresentationStyle = UIModalPresentationFormSheet;
                       [Singleton.rootViewController presentViewController:documentPicker animated:YES completion:nil];
                });
          
            
        }
        if (error) {
            DebugLog(@"文件下載失敗~~~~~~%@",error);
             dispatch_async(dispatch_get_main_queue(), ^{
             //遮罩關閉
             });
             self.jsapiCallback(@{@"result":@"0",@"errorMsg":@"文件下載失敗"});
// 51 //
        }
    }];

   // 創建的task都是掛起狀態，需要resume才能執行
   [task resume];
}
- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentsAtURLs:(NSArray <NSURL *>*)urls {
    DebugLog(@"*************************存儲成功");
    DebugLog(@"*************************%@",urls);
    self.jsapiCallback(@{@"result":@"1"});
}

// called if the user dismisses the document picker without selecting a document (using the Cancel button)
- (void)documentPickerWasCancelled:(UIDocumentPickerViewController *)controller{
   DebugLog(@"*************************存儲失敗");
    self.jsapiCallback(@{@"result":@"0",@"errorMsg":@"用戶取消操作"});
}

- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url{
   DebugLog(@"*************************");
}
//
- (NSString *)imageFilePath:(NSString *)imageUrl {
    // 1、獲取caches文件夾路徑
    NSString * cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    
    // 2、創建DownloadImages文件夾
    NSString * downloadImagesPath = [cachesPath stringByAppendingPathComponent:@"DownloadImages"];

    // 3、創建文件管理器對象
    NSFileManager * fileManager = [NSFileManager defaultManager];
    
    // 4、判斷文件夾是否存在
    if (![fileManager fileExistsAtPath:downloadImagesPath])
    {
        [fileManager createDirectoryAtPath:downloadImagesPath withIntermediateDirectories:YES attributes:nil error:nil];
    }
    
    // 5、拼接圖片在沙盒中的路徑
    /*
      因為每一個圖片URL對應的是一張圖片，而且URL中包含了文件的名稱，所以可以用圖片的URL來唯一表示圖片的名稱
      因為圖像URL中有"/"，"/"表示的是下級目錄的意思，要在存入前替換掉，所以用"_"代替
    */
    NSArray *imageArr = [imageUrl componentsSeparatedByString:@"/"];
    NSString * imageName = [imageArr lastObject];
    NSString * imageFilePath = [downloadImagesPath stringByAppendingPathComponent:imageName];

    // 6、返回文件路徑
    return imageFilePath;
}

 

2、選擇iPhone本地文件送給服務端

- (IBAction)shareAction:(id)sender {
    NSArray *types = @[@"public.content"];可選文件類型 types需要傳入一個uniform type identifiers (UTIs)數組。關於UTIs的官方文檔  3     UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:types inMode:UIDocumentPickerModeOpen];
    documentPicker.delegate = self;
    documentPicker.modalPresentationStyle = UIModalPresentationPageSheet;
    [self presentViewController:documentPicker animated:YES completion:nil];
    
}

- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url {
    BOOL canAccessingResource = [url startAccessingSecurityScopedResource];
    if(canAccessingResource) {
        NSFileCoordinator *fileCoordinator = [[NSFileCoordinator alloc] init];
        NSError *error;
        [fileCoordinator coordinateReadingItemAtURL:url options:0 error:&error byAccessor:^(NSURL *newURL) {
            NSData *fileData = [NSData dataWithContentsOfURL:newURL];
            NSArray *arr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
            NSString *documentPath = [arr lastObject];
            NSString *desFileName = [documentPath stringByAppendingPathComponent:@"file"];
            [fileData writeToFile:desFileName atomically:YES];
            NSLog(@"point_test_log%@",desFileName);
            [self dismissViewControllerAnimated:YES completion:NULL];
        }];
        if (error) {
            // error handing
        }
    } else {
        // startAccessingSecurityScopedResource fail
    }
    [url stopAccessingSecurityScopedResource];
}