iOS之自动生成UUID

#pragma mark -- gen_uuid()自动生成UUID
NSString * gen_uuid()
{
CFUUIDRef uuid_ref = CFUUIDCreate(NULL);
CFStringRef uuid_string_ref= CFUUIDCreateString(NULL, uuid_ref);

CFRelease(uuid_ref);
NSString *uuid = [NSString stringWithString:(__bridge NSString*)uuid_string_ref];

CFRelease(uuid_string_ref);
return uuid;
}

return uuid 就是生成的UUID了。

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