iOS的keychain服務提供了一種安全的保存私密信息（密碼，序列號，證書等）的方式，每個iOS程序都有一個獨立的keychain存儲。相對于NSUserDefaults、文件保存等一般方式，keychain保存更為安全，而且keychain里保存的信息不會因App被刪除而丟失，所以在重裝App后，keychain里的數據還能使用。 在應用里使用使用keyChain，我們需要導入Security.framework

要先聲明公共區的名稱，官方文檔管這個名稱叫“keychain access group”，聲明的方法是新建一個plist文件，名字隨便起，內容如下：

“yourAppID.com.yourCompany.whatever”就是你要起的公共區名稱

?

獲取UUID 并保存到keychain中：

#pragma mark--獲取設備UUID -(NSString*) uuid {if ([CHKeychain load:UUIDKEY]) {NSString *result = [CHKeychain load:UUIDKEY];return result;}else{CFUUIDRef puuid = CFUUIDCreate( nil );CFStringRef uuidString = CFUUIDCreateString( nil, puuid );NSString * result = (NSString *)CFStringCreateCopy( NULL, uuidString);CFRelease(puuid);CFRelease(uuidString);[CHKeychain save:UUIDKEY data:result];return [result autorelease];}return nil; }

　

CHKeychain 的實現代碼（需要導入Security.framework）：

CHKeychain.h

#import <Foundation/Foundation.h>@interface CHKeychain : NSObject+ (void)save:(NSString *)service data:(id)data; + (id)load:(NSString *)service; + (void)deleteData:(NSString *)service;@end

CHKeychain.m　　

#import "CHKeychain.h"@implementation CHKeychain + (NSMutableDictionary *)getKeychainQuery:(NSString *)service {return [NSMutableDictionary dictionaryWithObjectsAndKeys:(id)kSecClassGenericPassword,(id)kSecClass,service, (id)kSecAttrService,service, (id)kSecAttrAccount,(id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,nil]; }+ (void)save:(NSString *)service data:(id)data {//Get search dictionaryNSMutableDictionary *keychainQuery = [self getKeychainQuery:service];//Delete old item before add new itemSecItemDelete((CFDictionaryRef)keychainQuery);//Add new object to search dictionary(Attention:the data format)[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];//Add item to keychain with the search dictionarySecItemAdd((CFDictionaryRef)keychainQuery, NULL); }+ (id)load:(NSString *)service {id ret = nil;NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];//Configure the search setting//Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue[keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];[keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];CFDataRef keyData = NULL;if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {@try {ret = [NSKeyedUnarchiver unarchiveObjectWithData:(NSData *)keyData];} @catch (NSException *e) {NSLog(@"Unarchive of %@ failed: %@", service, e);} @finally {}}if (keyData)CFRelease(keyData);return ret; }+ (void)delete:(NSString *)service {NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];SecItemDelete((CFDictionaryRef)keychainQuery); }@end

　　

?參考：http://blog.csdn.net/u011439689/article/details/18707387

轉載于:https://www.cnblogs.com/samniu/p/3673781.html

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