Question

我的应用程序中有NSData，我想将数据保存在iCloud中。我不想将我的NSUserDefaults与iCloud同步，所以它没有克隆“Can I use iCloud to sync the NSUserDefaults plist file”。那可能吗？我怎样才能做到这一点？如何检索保存的数据？

Answer 1

是的，这是可能的。之前我已经完成了，我的回答是syncing zip with iCloud，我正在创建zip并将其转换为NSData并与iCloud同步，之后我收到NSData并再次将其转换为zip并解压缩内容。在这里，您的主要需求是同步NSData，以便您可以解决NSData。

1）创建UIDocument

的子类

#import <UIKit/UIKit.h>

@interface MyDocument : UIDocument
    @property (strong) NSData *dataContent;
@end

2）MyDocument.m

#import "MyDocument.h"

@implementation MyDocument
@synthesize dataContent;

// Called whenever the application reads data from the file system
- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError **)outError
{
    self.dataContent = [[NSData alloc] initWithBytes:[contents bytes] length:[contents length]];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"noteModified" object:self];
    return YES;     
}

// Called whenever the application (auto)saves the content of a note
- (id)contentsForType:(NSString *)typeName error:(NSError **)outError 
{
    return self.dataContent;
}

@end

3）与iCloud同步（您可以根据需要进行）

-(IBAction) iCloudSyncing:(id)sender
{

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

    MyDocument *mydoc = [[MyDocument alloc] initWithFileURL:ubiquitousPackage];
    NSData *data = << YOUR NSDATA >>;
    mydoc.dataContent = data;

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

     }];
}

希望这会有所帮助..

Answer 2

// 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 :)

Answer 3

1）Converting data into zip file and then saving to icloud

2）saving a xml file to icloud

这里有解决方案来保存icloud中的数据，否则我们可以将这些数据写入文件，我们可以通过提供文件路径将该文件直接保存到icloud

Answer 4

自定义对象注意：每个iCloud用户限制为1 MB！

+(void)write{

//Decode using
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:[HistoryFile files]];

//Save Data To NSUserDefault
NSUbiquitousKeyValueStore *iCloud =  [NSUbiquitousKeyValueStore defaultStore];

//let ios know we want to save the data    
[iCloud setObject:data forKey:@"app_data"];


//iOS will save the data when it is ready.
[iCloud synchronize];

}


+(NSMutableArray*)read{
    //Read Settings Value From NSUserDefault
    //get the NSUserDefaults object

    NSUbiquitousKeyValueStore *iCloud =  [NSUbiquitousKeyValueStore defaultStore];
    //read value back from the settings
    NSData *data = [iCloud objectForKey:@"app_data"];
    NSMutableArray *data_array = (NSMutableArray*)[NSKeyedUnarchiver unarchiveObjectWithData:data];    
    NSLog(@"data_array %@",data_array);
    return data_array;
}

如何在iCloud中保存NSData

4 个答案: