iosversion

NSString *version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];

if ([version compare:@"2.0.14" options:NSNumericSearch] ==NSOrderedDescending ) {
        NSLog(@"当前版本较高");
    }else  {
        NSLog(@"当前版本较低");
    }