来自iCloud Drive的iOS下载文件

2019年8月6日 349次阅读

在我的iOS应用程序中,我将一些文件存储到iCloud Drive文件夹进行备份.现在我想要检索该文件,但我不知道哪个是正确的方法.我的意思是,如果iCloud Drive有任何特定的方法,或者我可以从网址获取它.

我将文件存储到iCLoud,如下所示(https://stackoverflow.com/a/27358392/3065901)：

- (void) storeToIcloud
{
   // Let's get the root directory for storing the file on iCloud Drive
   [self rootDirectoryForICloud:^(NSURL *ubiquityURL) {

        if (ubiquityURL) {

             // We also need the 'local' URL to the file we want to store

             NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
             NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
             NSString *filePath = [documentsPath stringByAppendingPathComponent:@"myFile.xml"]; //Add the file name

             NSURL *localURL = [NSURL fileURLWithPath:filePath];

             // Now, append the local filename to the ubiquityURL
             ubiquityURL = [ubiquityURL URLByAppendingPathComponent:localURL.lastPathComponent];

             // And finish up the 'store' action
             NSError *error;
             if (![[NSFileManager defaultManager] setUbiquitous:YES itemAtURL:localURL destinationURL:ubiquityURL error:&error]) {
                NSLog(@"Error occurred: %@", error);
             }
        }
        else {
            NSLog(@"Could not retrieve a ubiquityURL");
        }
   }];
}

- (void)rootDirectoryForICloud:(void (^)(NSURL *))completionHandler {

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSURL *rootDirectory = [[[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil]URLByAppendingPathComponent:@"Documents"];

        if (rootDirectory) {
             if (![[NSFileManager defaultManager] fileExistsAtPath:rootDirectory.path isDirectory:nil]) {
                  NSLog(@"Create directory");
                  [[NSFileManager defaultManager] createDirectoryAtURL:rootDirectory withIntermediateDirectories:YES attributes:nil error:nil];
             }
        }

        dispatch_async(dispatch_get_main_queue(), ^{
             completionHandler(rootDirectory);
        });
    });
}

- (NSURL *)localPathForResource:(NSString *)resource ofType:(NSString *)type {
      NSString *documentsDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
      NSString *resourcePath = [[documentsDirectory stringByAppendingPathComponent:resource] stringByAppendingPathExtension:type];
      return [NSURL fileURLWithPath:resourcePath];
}

如何从iCloud驱动器下载文件？

提前致谢.

最佳答案 您应该使用NSMetadataQuery从icloud获取项目,然后当您将书签挂钩到文件时使用NSFileCoordination来读取它,可以使用相同的方法从云或您的应用程序沙箱中读取…所有内容都在详细信息：
Building Document Based Apps,甚至还有一些示例代码可供您遵循.希望这可以帮助！

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