__IPHONE_OS_VERSION_MAX_ALLOWED的使用

• 应用场景图示

  
  
  

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• 详情代码

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0 // Xcode 8编译会调用    作用:编译环境判断，判断当前开发时使用的sdk的版本。
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        center.delegate = self;
        [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionCarPlay) completionHandler:^(BOOL granted, NSError *_Nullable error) {
            if (!error)
            {
                NSLog(@"request authorization succeeded!");
            }
        }];
        
        [[UIApplication sharedApplication] registerForRemoteNotifications];
#else // Xcode 7编译会调用
        NSLog(@"执行吗�");
        UIUserNotificationType types = (UIUserNotificationTypeAlert | UIUserNotificationTypeSound | UIUserNotificationTypeBadge);
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
#endif

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