注册推送的方式

 //注册推送
    if (@available(iOS 10.0, *)) {
        // iOS10及以上注册远程通知的方法
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        // 必须写代理，不然无法监听通知的接收与点击
        center.delegate = self;
        [center requestAuthorizationWithOptions:UNAuthorizationOptionAlert | UNAuthorizationOptionBadge | UNAuthorizationOptionSound completionHandler:^(BOOL granted, NSError * _Nullable error) {
            if (granted) {
                // 点击允许
                NSLog(@"注册成功");
                [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
                    NSLog(@"%@", settings);
                }];
            } else {
                // 点击不允许
                NSLog(@"注册失败");
            }
        }];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
    } else if (@available(iOS 8.0, *)) {
        // iOS8-iOS10注册远程通知的方法
        UIUserNotificationType types = UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound;
        UIUserNotificationSettings *mySettings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:mySettings];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
    } else {
        // 在iOS8之前注册远程通知的方法，如果项目中要支持iOS8之前的版本，必须要写此方法
        UIRemoteNotificationType types = UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound;
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:types];
        
    }