iOS开发:防止文件进行iCloud备份

　

代码如下：

#pragma mark –  Excluding a File from Backups on iOS 5.1

 

– (BOOL)addSkipBackupAttributeToItemAtURL_iOS5_1:(NSURL *)URL

{

   assert([[NSFileManager defaultManager] fileExistsAtPath: [URL path]]);

   

   NSError *error = nil;

   BOOL success = [URL setResourceValue: [NSNumber numberWithBool: YES]

                                 forKey: NSURLIsExcludedFromBackupKey error: &error];

   if(!success){

       NSLog(@”Error excluding %@ from backup %@”, [URL lastPathComponent], error);

   }

   return success;

}

 

#pragma mark – Setting the Extended Attribute on iOS 5.0.1

#import

– (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL

{

   assert([[NSFileManager defaultManager] fileExistsAtPath: [URL path]]);

   

   const char* filePath = [[URL path] fileSystemRepresentation];

   

   const char* attrName = “com.apple.MobileBackup”;

   u_int8_t attrValue = 1;

   

   int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);

   return result == 0;

}

 

– (NSURL *)getDefaultDir

{

   NSURL *urlDefault = nil;

   NSString *strDic = nil;

   

   NSString *strVersion = [[UIDevice currentDevice] systemVersion];

float fVersion = 0.0;

if(strVersion.length > 0)

fVersion = [strVersion floatValue];

   

   if (fVersion == 5.0) {

       strDic = [NSString stringWithFormat:@”%@/Library/Caches/”,

                 NSHomeDirectory()];

   } else {

       strDic = [NSString stringWithFormat:@”%@/Library/%@/”,

                 NSHomeDirectory(),

                 [[NSBundle mainBundle] bundleIdentifier]];

   }

   

   if (![[NSFileManager defaultManager] fileExistsAtPath:strDic]) {

       [[NSFileManager defaultManager] createDirectoryAtPath:strDic withIntermediateDirectories:YES attributes:nil error:nil];

   }

   

   urlDefault = [NSURL fileURLWithPath:strDic];

   

   if (fVersion > 5.0 && fVersion < 5.1)

       [self addSkipBackupAttributeToItemAtURL:urlDefault];

   else if (fVersion >= 5.0)

       [self addSkipBackupAttributeToItemAtURL_iOS5_1:urlDefault];

   

   return urlDefault;

}

 

icloud备份，这个东西比较烦人，但从用户的角度，好多东西确实没必要备份。

 

苹果官方文档地址:https://developer.apple.com/library/ios/qa/qa1719/_index.html