JPush-flutter-plugin 期望改进的2个地方

[LongXiangGuo]

每次启动均需要通过请求授权来设置代理,这与App本身的启动流程不符合**(产品要求先检查权限,开启则不需要请求权限， JPush需要在Setup内置默认权限检查,并设置代理)**

- (void)applyPushAuthority:(FlutterMethodCall*)call result:(FlutterResult)result {
    JPLog(@"applyPushAuthority:%@",call.arguments);
    notificationTypes = 0;
    NSDictionary *arguments = call.arguments;
    if ([arguments[@"sound"] boolValue]) {
        notificationTypes |= JPAuthorizationOptionSound;
    }
    if ([arguments[@"alert"] boolValue]) {
        notificationTypes |= JPAuthorizationOptionAlert;
    }
    if ([arguments[@"badge"] boolValue]) {
        notificationTypes |= JPAuthorizationOptionBadge;
    }
    JPUSHRegisterEntity * entity = [[JPUSHRegisterEntity alloc] init];
    entity.types = notificationTypes;

    /// 如果app已经授权通知权限,flutter端不用调用`applyPushAuthority:`, 默认在`setup`方法中实现默认的代理设置并在代理设置成功后返回`result`事件表示初始化已经完成；
    [JPUSHService registerForRemoteNotificationConfig:entity delegate:self];
}

2. 关于iOS setBadge为0的时候建议增加可选值, 允许保留通知中心的通知(产品有这个需求)，

• 关于如何实现清除角标不清除通知可以参考这两个连接

https://stackoverflow.com/questions/37789581/clear-applicationiconbadgenumber-without-removing-notifications-not-working/41758039#41758039

https://developer.apple.com/forums/thread/7598