我正试图在Flutter中使用PlatformViews在我的Flutter应用中原生显示Swift代码，然而我的应用在我当前的代码中崩溃。
这是我的AppDelegate，目前我正在调用我的方法通道。
import Foundation
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate, TJPlacementDelegate {
var p = TJPlacement()
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
let channelName = "NativeView"
let rootViewController : FlutterViewController = window?.rootViewController as! FlutterViewController
let methodChannel = FlutterMethodChannel(name: channelName, binaryMessenger: rootViewController as! FlutterBinaryMessenger)
methodChannel.setMethodCallHandler {(call: FlutterMethodCall, result: FlutterResult) -> Void in
if (call.method == "setDebugEnabled") {
let isDebug = call.arguments as! Bool
Tapjoy.setDebugEnabled(isDebug)
}
}
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}
这是我的Dart实现的原生代码。
import 'package:flutter/material.dart';
import 'tapjoy.dart';
class Home extends StatefulWidget {
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
@override
void initState() {
callTapjoy();
super.initState();
}
Widget build(context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Test'),
),
body: UiKitView(viewType: 'NativeView'),
),
);
}
void callTapjoy() {
Tapjoy.setDebugEnabled(true);
}
}
//My code in tapjoy.dart
class Tapjoy {
static const MethodChannel _channel = const MethodChannel('NativeView');
static void setDebugEnabled(bool isDebug) {
_channel.invokeMethod('setDebugEnabled', {"isDebug": isDebug});
}
}
我的应用程序崩溃了，并在调试控制台显示错误。
Could not cast value of type '__NSDictionaryM' (0x7fff87a61d78) to 'NSNumber' (0x7fff87b1eb08).
2020-04-29 16:56:42.985269+0530 Runner[18484:224162] Could not cast value of type '__NSDictionaryM' (0x7fff87a61d78) to 'NSNumber' (0x7fff87b1eb08).
解决方案：
你正在传递一个 Map 从Dart到本地。{"isDebug": isDebug}所以你需要在Swift端从mapdictionary中提取参数。
if let args = call.arguments as? Dictionary<String, Any>,
let isDebug = args["isDebug"] as? Bool {
// please check the "as" above - wasn't able to test
// handle the method
result(nil)
} else {
result(FlutterError.init(code: "errorSetDebug", message: "data or format error", details: nil))
}
或者，只需要从Dart端传递布尔值，而不需要先把它放到map中。
_channel.invokeMethod('setDebugEnabled', isDebug);
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