IOS 生成唯一字符串的方法

/**

*  获取唯一  ID字符串

*/

+ (NSString*)get_ONLYID;

+ (NSString*)get_ONLYID{

CFUUIDRef uuidRef =CFUUIDCreate(NULL);

CFStringRef uuidStringRef =CFUUIDCreateString(NULL, uuidRef);

NSString *uniqueId = (__bridge NSString *)(uuidStringRef);

return uniqueId;

}