利用KeyChain保存、获取设备唯一识别UUID

一、需要导入Security.framework

二、填写bundle id

二、Target - Capabilities - Keychain Sharing -ON

注意这个Keychain Sharing和上述bundle id的数值应该是一样的。

此时左侧目录会自动生成Entitlements文件。

三、编写两个类

UUID类

.h文件

#import <Foundation/Foundation.h> 

@interface UUID : NSObject

+(NSString *)getUUID;

@end

.m文件

代码照片

以下为代码（就是把上面图片的代码赋值下来，方便拷贝）

#import "UUID.h"

#import "GSKey.h"

#define  KEY_USERNAME_PASSWORD @"com.company.xueban.usernamepassword"

#define  KEY_USERNAME @"com.company.xueban.username"

#define  KEY_PASSWORD @"com.company.xueban.password"

@implementation UUID

+(NSString *)getUUID{   

NSString * strUUID = (NSString *)[GSKey load:@"com.company.xueban.usernamepassword"];       

//首次执行该方法时，uuid为空   

if ([strUUID isEqualToString:@""] || !strUUID)    {       

//生成一个uuid的方法       

CFUUIDRef uuidRef = CFUUIDCreate(kCFAllocatorDefault);               

strUUID = (NSString *)CFBridgingRelease(CFUUIDCreateString (kCFAllocatorDefault,uuidRef));               

//将该uuid保存到keychain       

[GSKey save:KEY_USERNAME_PASSWORD data:strUUID];           

}   

return strUUID;

}

@end

GSKey类

.h文件

代码图片

以下为代码：

#import <Foundation/Foundation.h>

@interface GSKey : NSObject

+ (void)save:(NSString *)service data:(id)data;

+ (id)load:(NSString *)service;

+ (void)deleteKeyData:(NSString *)service;

@end

.m文件

代码图片

代码（用于复制）

#import "GSKey.h" #import "GSKey.h" //static NSString* const KEY_INKEYCHAIN_UUID =@"唯一识别的KEY_UUID"; //static NSString* const KEY_UUID =@"唯一识别的key_uuid"; @implementation GSKey + (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 dictionary     NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];     //Delete old item before add new item     SecItemDelete((CFDictionaryRef)keychainQuery);     //Add new object to search dictionary(Attention:the data format)     [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data requiringSecureCoding:false error:nil] forKey:(id)kSecValueData];     //Add item to keychain with the search dictionary     SecItemAdd((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 {             #pragma clang diagnostic push             #pragma clang diagnostic ignored "-Wdeprecated-declarations"             ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];             #pragma clang diagnostic pop             //ret = [NSKeyedUnarchiver unarchivedObjectOfClass:(__bridge NSData *)keyData fromData:(__bridge NSData *)keyData error:nil];         } @catch (NSException *e) {             NSLog(@"Unarchive of %@ failed: %@", service, e);         } @finally {         }     }     if (keyData)         CFRelease(keyData);     return ret; } + (void)deleteKeyData:(NSString *)service {     NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];     SecItemDelete((CFDictionaryRef)keychainQuery); } @end