objective-c - iCloud Drive - 读写 (NSData)

Question

尝试将自定义对象保存为 NSData 然后上传到 iCloud Drive

有什么方向吗？我已经尝试过键值方法，但它仅限于 1MB：/

这是正确的方法吗？ 如果是，我如何从 iCloud 路径中读取？

+(void)iCloudWrite:(NSData*)data
{

    NSURL* ubiq = [[NSFileManager defaultManager]URLForUbiquityContainerIdentifier:nil];
    NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"]  URLByAppendingPathComponent:@"iCloudHistory.zip"];

    MyDocument *mydoc = [[MyDocument alloc] initWithFileURL:ubiquitousPackage];
    mydoc.dataContent = data;

    [mydoc saveToURL:[mydoc fileURL] forSaveOperation:UIDocumentSaveForOverwriting completionHandler:^(BOOL success)
     {
         if (success)
         {
             NSLog(@"Synced with icloud");
         }
         else
             NSLog(@"Syncing FAILED with icloud");
     }];
}

编辑：

Answer 1

// 1. Any file can be uploaded to iCloud container of any size (yes you should be having that much of space in iCloud) lets take an example SampleData.zip

// 2. This method will upload or sync SampleData.zip file in iCloud container, iCloud actually checks the metadata of your file before it uploads it into your iCloud container (so for first time it will upload the file and from next time it will only upload the changes)

-(void) iCloudSyncing:(id)sender
{
    //Doc dir
    NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"SampleData.zip"];
    NSURL *u = [[NSURL alloc] initFileURLWithPath:filePath];
    NSData *data = [[NSData alloc] initWithContentsOfURL:u];

    //Get iCloud container URL
    NSURL *ubiq = [[NSFileManager defaultManager]URLForUbiquityContainerIdentifier:nil];// in place of nil you can add your container name
    //Create Document dir in iCloud container and upload/sync SampleData.zip
    NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"]URLByAppendingPathComponent:@"SampleData.zip"];
    Mydoc = [[MyDocument alloc] initWithFileURL:ubiquitousPackage];
    Mydoc.zipDataContent = data;

    [Mydoc saveToURL:[Mydoc fileURL] forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success)
     {
         if (success)
         {
             NSLog(@"SampleData.zip: Synced with icloud");
         }
         else
             NSLog(@"SampleData.zip: Syncing FAILED with icloud");

     }];
}



  // 3 Download data from the iCloud Container

- (IBAction)GetData:(id)sender {

    //--------------------------Get data back from iCloud -----------------------------//
    id token = [[NSFileManager defaultManager] ubiquityIdentityToken];
    if (token == nil)
    {
        NSLog(@"ICloud Is not LogIn");
    }
    else
    {
        NSLog(@"ICloud Is LogIn");

        NSError *error = nil;
        NSURL *ubiq = [[NSFileManager defaultManager]URLForUbiquityContainerIdentifier:nil];// in place of nil you can add your container name
        NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"]URLByAppendingPathComponent:@"SampleData.zip"];
        BOOL isFileDounloaded = [[NSFileManager defaultManager]startDownloadingUbiquitousItemAtURL:ubiquitousPackage error:&error];
        if (isFileDounloaded) {
            NSLog(@"%d",isFileDounloaded);
            NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
            //changing the file name as SampleData.zip is already present in doc directory which we have used for upload
            NSString* fileName = [NSString stringWithFormat:@"RecSampleData.zip"];
            NSString* fileAtPath = [documentsDirectory stringByAppendingPathComponent:fileName];
            NSData *dataFile = [NSData dataWithContentsOfURL:ubiquitousPackage];
            BOOL fileStatus = [dataFile writeToFile:fileAtPath atomically:NO];
            if (fileStatus) {
                NSLog(@"success");
            }
        }
        else{
            NSLog(@"%d",isFileDounloaded);
        }
    }
}

//4 voila its done :)

不要忘记将以下参数添加到您的 plist

<key>NSUbiquitousContainers</key>
    <dict>
        <key>YourCloudContainerID</key>
        <dict>
            <key>NSUbiquitousContainerIsDocumentScopePublic</key>
            <true/>
            <key>NSUbiquitousContainerName</key>
            <string>YourCloudContainerName</string>
            <key>NSUbiquitousContainerSupportedFolderLevels</key>
            <string>Any</string>
        </dict>
    </dict>