typescript 离子服务后，无法解析 [object OBJECT] 的所有参数
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can't resolve all parameters for [object OBJECT], after ionic serve
提问by J.Rem
not sure what I'm doing wrong, but when trying to use ionic and Cordova plugins I receive the following error after ionic serve: "can't resolve all parameters for [object OBJECT],[object OBJECT],[object OBJECT],[object OBJECT],[object OBJECT],?"
不知道我做错了什么，但是在尝试使用 ionic 和 Cordova 插件时，我在 ionic serve 后收到以下错误：“无法解析 [object OBJECT]、[object OBJECT]、[object OBJECT] 的所有参数， [对象对象],[对象对象],?"
import { Component, Injectable } from '@angular/core';
import { NavController } from 'ionic-angular';
import { ToastController } from 'ionic-angular';
import { File } from '@ionic-native/file';
import { Diagnostic } from '@ionic-native/diagnostic';
import { CameraPreview, CameraPreviewOptions, CameraPreviewDimensions} from '@ionic-native/camera-preview';
declare var cordova: any;
@Component({
selector: 'page-home',
templateUrl: 'home.html',
providers: [CameraPreview, Diagnostic]
})
export class HomePage {
constructor(
public navCtrl: NavController,
public toastCtrl: ToastController,
public file:File,
public diagnostic:Diagnostic,
public cameraPreview: CameraPreview,
public previewRect: CameraPreviewOptions
) {
this.checkPermissions();
}
回答by Iris_geek
I got the same issue somewhere, so I removed the last parameter of constructor and given it before constructor. In your case like this,
我在某处遇到了同样的问题，所以我删除了构造函数的最后一个参数并在构造函数之前给了它。在你这样的情况下，
export class HomePage {
public previewRect: CameraPreviewOptions;
constructor(
public navCtrl: NavController,
public toastCtrl: ToastController,
public file:File,
public diagnostic:Diagnostic,
public cameraPreview: CameraPreview
) {
this.checkPermissions();
}
}
I don't know if this is the right solution but resolved my issue.
我不知道这是否是正确的解决方案，但解决了我的问题。
回答by Miroslav Jonas
This is a less known angular dependency issue, where compiler is unable to untangle the dependency tree.
这是一个鲜为人知的角度依赖问题，编译器无法解开依赖树。
The solution is to use @Injectwith declarations.
解决方案是使用@Inject声明。
export class HomePage {
constructor(
public navCtrl: NavController,
public toastCtrl: ToastController,
public file:File,
public diagnostic:Diagnostic,
@Inject(CameraPreview) public cameraPreview: CameraPreview
) {
this.checkPermissions();
}
}
With this you are saying to compiler that missing class will be injected at later point.
有了这个，你对编译器说缺少的类将在稍后注入。
Also, important is to say that CameraPreviewitself should be decorated with @Injectable().
另外，重要的是说CameraPreview本身应该用@Injectable().
@Injectable()
export class CameraPreview
// ... your code
}
回答by Imran
Restart your ionic application may clear this issue if everything is imported as expected
如果一切都按预期导入，重新启动您的离子应用程序可能会清除此问题
