iphone通訊錄的備份與恢復

最近在做iOS系統通訊錄備份到伺服器，並且可以從伺服器中下載備份文件恢復到手機的功能，部分實現細節記錄如下。

將iphone系統通訊錄生成.vcf文件

ABAddressBookRef addressBook = ABAddressBookCreate();
CFArrayRef contacts = ABAddressBookCopyArrayOfAllPeople(addressBook);
CFDataRef vcards = (CFDataRef)ABPersonCreateVCardRepresentationWithPeople(contacts);
NSString *vcardString = [[NSString alloc] initWithData:(__bridge NSData *)vcards encoding:NSUTF8StringEncoding];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *folderPath = [paths objectAtIndex:0];
NSString *filePath = [folderPath stringByAppendingPathComponent:@"contacts.vcf"];

[vcardString writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];

運行後系統沙盒Document目錄下會生成contacts.vcf文件，上傳至伺服器即可。

通訊錄恢復：

從伺服器下載contents.vcf文件，用系統通訊錄程式打開即可恢復至手機。或者代碼解析.vcf文件更新通訊錄即可。

 NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
 NSString *plistPath = [paths objectAtIndex:0];
 NSString *filePath =[plistPath stringByAppendingPathComponent:@"contacts.vcf"];
 CFDataRef vCardData = (CFDataRef)[filePath dataUsingEncoding:NSUTF8StringEncoding]; 
 ABAddressBookRef book = ABAddressBookCreate();
 ABRecordRef defaultSource = ABAddressBookCopyDefaultSource(book);
 CFArrayRef vCardPeople = ABPersonCreatePeopleInSourceWithVCardRepresentation(defaultSource, vCardData);
 for (CFIndex index = 0; index < CFArrayGetCount(vCardPeople); index++) {
     ABRecordRef person = CFArrayGetValueAtIndex(vCardPeople, index);
     ABAddressBookAddRecord(book, person, NULL);
     CFRelease(person);
 }
 CFRelease(vCardPeople);
 CFRelease(defaultSource);
 ABAddressBookSave(book, NULL);
 CFRelease(book);

註意：ABPersonCreateVCardRepresentationWithPeople只適用ios5.0以上系統。

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