我已经构建了一个Angular + nativescript应用程序。我试图隐藏动作栏(像很多人一样)。
我已经做了两个服务助手。两者都有相同的签名。一个用于网络,另一个用于移动。对于移动助手,我处理我注入的TNS页面组件。
但是当我运行移动应用程序时,操作栏始终在这里。
行动吧,helper.service.tns.ts:
import { Injectable } from "@angular/core";
import { Page } from "tns-core-modules/ui/page/page";
@Injectable()
export class ActionBarHelperService {
constructor(private page: Page){
}
hideActionBar(){
this.page.actionBarHidden = true;
}
}
行动吧,helper.service.ts:
import { Injectable } from "@angular/core";
@Injectable()
export class ActionBarHelperService {
constructor(){}
hideActionBar(){}
}
login.component.ts:
@Component({
selector: 'app-login',
moduleId: module.id,
templateUrl: './login.component.html',
styleUrls: ['./login.component.css']
})
export class LoginComponent{
constructor(private actionBarHelperService: ActionBarHelperService)
{
this.actionBarHelperService.hideActionBar();
}
}
另外,我在main.tns.ts中将createFrameOnBootstrap设置为true:
import { platformNativeScriptDynamic } from 'nativescript-angular/platform';
import { AppModule } from './app/app.module';
platformNativeScriptDynamic({ createFrameOnBootstrap: true }).bootstrapModule(AppModule);
我不知道是否有这个帮助,但是当我运行我的模拟器并且我没有将其设置为true时,我发出一个错误,表示该页面为null:
Successfully synced application org.nativescript.docdoc on device emulator-5554.
JS: Angular is running in the development mode. Call enableProdMode() to enable the production mode.
JS: ERROR TypeError: Cannot set property 'actionBarHidden' of null
JS: ERROR CONTEXT {
JS: "view": {
JS: "def": {
JS: "nodeFlags": 33669121,
JS: "rootNodeFlags": 33554433,
JS: "nodeMatchedQueries": 0,
JS: "flags": 0,
JS: "nodes": [
JS: {
JS: "nodeIndex": 0,
JS: "parent": null,
JS: "renderParent": null,
JS: "bindingIndex": 0,
JS: "outputIndex": 0,
JS: "checkIndex": 0,
JS: "flags": 33554433,
JS: "childFlags": 114688,
JS: "directChildFlags": 114688,
JS: "childMatchedQueries": 0,
JS: "matchedQueries": {},
JS: "matchedQueryIds": 0,
JS: "references": {},
JS: "ngContentIndex": null,
JS: "childCount": 1,
JS: "bindings": [],
JS: "bindingFlags": 0,
JS: "outputs": [],
JS: "element": {
JS: "ns": "",
JS: "name": "app-login",
JS: "attrs": [],
JS: "template": null,
JS: "componentProvider": {
JS: "nodeIndex": 1,
JS: "parent": "[Circular]",
JS: "renderParent": "[Circular]",
JS: "bindingIndex":...
任何想法或解决方案?
感谢@Manoj,我写了一个指令。见下文:
import { Directive } from '@angular/core';
import { Page } from 'tns-core-modules/ui/page/page';
@Directive({
selector: '[hideActionBar]'
})
export class HideActionBarDirective {
constructor(private page: Page) {
this.page.actionBarHidden = true;
}
}
现在在我的login.component.tns.html中:
<StackLayout hideActionBar>
<Button text="login works!" class="btn btn-primary"></Button>
</StackLayout>
由于ActionBarHelperService
是LoginComponent
的依赖项,因此必须在创建页面之前实例化该服务。
也许你可以将页面作为参数传递给hideActionBar
方法或者只是在visibility
中的ActionBar
标签上设置login.component.html
属性或者使用指令代替服务。
ActionBarHelperService期望构造函数中的参数(页面)(
constructor(private page: Page)
)但是当你通过以下方式在login.component.ts中创建它的实例时,在ActionBarHelperService中没有传递任何结果
constructor(private actionBarHelperService: ActionBarHelperService)