【IOS工具类】获得设备唯一标识，删除应用不重新生成

文章转载自：http://www.cnblogs.com/qingjoin/p/3549325.html （有做修改）

PS:因为使用keychain方式，所以删除应用不重新生成identifierForVendor

#define safeString(obj) (([obj isEqual:[NSNull null]]||obj==nil||[@"null"isEqual:obj]) ? @"" : ([NSString stringWithFormat:@"%@",obj]))

#import <Foundation/Foundation.h>

@interface UUIDUtil : NSObject

+(NSString *)getUUID;

@end

#import "UUIDUtil.h"

@implementation UUIDUtil

static UUIDUtil * instance = nil;

+(NSString *)getUUID{
NSString * const KEY_USERNAME_PASSWORD = @"com.sb.giftcardapp.usernamepassword";//这里你需要修改为自己应用的id，才不会重复
NSString * const KEY_PASSWORD = @"com.sb.giftcardapp.password";
NSMutableDictionary *readUserPwd = (NSMutableDictionary *)[self load:KEY_USERNAME_PASSWORD];
if(readUserPwd == nil || [@""isEqualToString:safeString([readUserPwd objectForKey:KEY_PASSWORD])]){
NSString *identifierStr = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
NSMutableDictionary *usernamepasswordKVPairs = [NSMutableDictionary dictionary];
[usernamepasswordKVPairs setObject:identifierStr forKey:KEY_PASSWORD];
//save
[self save:KEY_USERNAME_PASSWORD data:usernamepasswordKVPairs];
//read
readUserPwd = (NSMutableDictionary *)[self load:KEY_USERNAME_PASSWORD];
}
NSString *uuidString = [readUserPwd objectForKey:KEY_PASSWORD];
NSLog(@"uuidString = %@",uuidString);
return uuidString;
}

+ (void)save:(NSString *)service data:(id)data{
//Get search dictionary
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
//Delete old item before add new item
SecItemDelete((__bridge CFDictionaryRef)keychainQuery);
//Add new object to search dictionary(Attention:the data format)
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge id)kSecValueData];
//Add item to keychain with the search dictionary
SecItemAdd((__bridge CFDictionaryRef)keychainQuery, NULL);
}

+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {
return [NSMutableDictionary dictionaryWithObjectsAndKeys:
(__bridge id)kSecClassGenericPassword,(__bridge id)kSecClass,
service, (__bridge id)kSecAttrService,
service, (__bridge id)kSecAttrAccount,
(__bridge id)kSecAttrAccessibleAfterFirstUnlock,(__bridge id)kSecAttrAccessible,
nil];
}

//取
+ (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:(__bridge id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData];
[keychainQuery setObject:(__bridge id)kSecMatchLimitOne forKey:(__bridge id)kSecMatchLimit];
CFDataRef keyData = NULL;
if (SecItemCopyMatching((__bridge CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
@try {
ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge 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((__bridge CFDictionaryRef)keychainQuery);
}

@end

使用方法

#import "UUIDUtil.h"

#define UDID [UUIDUtil getUUID]

此类可以搭配我的另一个博文使用：http://blog.csdn.net/coooliang/article/details/39373649