如何解决如何在iOS中使用单独的FlutterEngine注册Flutter应用程序插件
由于我的iOS委托方法didUpdateLocation被调用,因此我的Flutter应用程序的隔离功能在后台醒来。
当didUpdateLocation被调用时,我能够在颤动侧看到打印日志,但是当我尝试使用path_provider时,却遇到了缺少的插件异常。
我相信我的问题是我没有向在didUpdateLocations中产生的Flutter Engine注册应用程序插件
注意:本机iOS端上的此位置逻辑当前在Main Flutter应用程序中,而不是插件中
主要问题:
奖金问题:
- 我需要手动销毁颤振引擎吗? (请参阅cleanUpFlutterResources) 关于在应用程序终止时运行的最佳方法,是最好的做法是创建一个Flutter引擎,并在每次调用后台iOS委托回调时销毁它,还是我应该使用一个运行所有后台程序的后台通道创建一个隔离时间?
func locationManager(_ manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
if let location = locations.first {
guard let callbackHandle = LocalStorage.getStoredCallbackHandle(),let FlutterCallbackinformation = FlutterCallbackCache.lookupCallbackinformation(callbackHandle) else {
return
}
var FlutterEngine: FlutterEngine? = FlutterEngine(name: "atc_location_swift.BGThread",project: nil,allowHeadlessExecution: true)
FlutterEngine!.run(withEntrypoint: FlutterCallbackinformation.callbackName,libraryURI: FlutterCallbackinformation.callbackLibraryPath)
FlutterEngine!.registrar(forPlugin: "FLTPathProviderPlugin")
var backgroundMethodChannel: FlutterMethodChannel? = FlutterMethodChannel(name: "plugins.atc.io/location_background",binaryMessenger: FlutterEngine!.binaryMessenger)
func cleanupFlutterResources() {
FlutterEngine?.destroyContext()
backgroundMethodChannel = nil
FlutterEngine = nil
}
backgroundMethodChannel?.setMethodCallHandler { (call,result) in
result(true)
backgroundMethodChannel?.invokeMethod("triggerBackgroundTask",arguments: ["lat": 0.1,"lon": 0.2],result: { FlutterResult in
print("Flutter result \(FlutterResult ?? "no result sent")")
cleanupFlutterResources()
})
}
print("location: \(location.coordinate)")
}
}
这是我的飞镖隔离物。基本上我正在打印“现在调用回调-> $ Now”,但是当我尝试addItemToDataList()时,路径提供程序插件被引用并抛出缺少的插件异常
void callback() async {
WidgetsFlutterBinding.ensureInitialized();
const MethodChannel _backgroundChannel =
MethodChannel('plugins.atc.io/location_background');
_backgroundChannel.setMethodCallHandler((MethodCall call) async {
try {
WidgetsFlutterBinding.ensureInitialized();
final String Now = DateTime.Now().toString();
print("callback called Now -> $Now");
await LocationDataSource.addItemToDataList(Now);
return Future.value(true);
} catch (e) {
print("exception calling callback: $e");
return Future.value(false);
}
});
_backgroundChannel.invokeMethod('backgroundChannelInitialized');
}
这是我的GeneratedpluginRegistrant,似乎在调用Flutter run时,依赖项(path_provider)已在此处用本机代码注册,但是从飞镖隔离调用路径提供程序插件时,似乎并没有达到目的
#if __has_include(<path_provider/FLTPathProviderPlugin.h>)
#import <path_provider/FLTPathProviderPlugin.h>
#else
@import path_provider;
#endif
@implementation GeneratedpluginRegistrant
+ (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>*)registry {
[FLTPathProviderPlugin registerWithRegistrar:[registry registrarForPlugin:@"FLTPathProviderPlugin"]];
}
@end
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