这个需要用户直接在 didFinishLaunchingWithOptions 和 didReceiveRemoteNotification 这两个方法里面捕获payload内容 自己去实现
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给payload添加自定义参数。
app在前台或者后台的时候用didReceiveRemoteNotification:
app未运行状态的时候didFinishLaunchingWithOptions:
NSDictionary* userInfo = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey];