Question

我使用this

建立了相机组件

HTML

<StackLayout exampleTitle toggleNavButtonrm>
    <ScrollView>
        <!-- >> camera-module-html -->
        <FlexboxLayout flexDirection="column-reverse">
            <Image [src]="imageTaken" flexGrow="3" class="img-rounded"></Image>  
            <Button text="Take Photo" class="btn btn-primary btn-active" (tap)="onTakePhoto()" flexGrow="1"></Button>
            <Button text="Request permissions" class="btn btn-primary btn-active" (tap)="onRequestPermissions()" flexGrow="1"></Button>         
        </FlexboxLayout>
        <!-- << camera-module-html -->
    </ScrollView>
</StackLayout>

component.ts

import { Component } from "@angular/core";
import { ImageAsset } from "image-asset";
import * as camera from "nativescript-camera";

@Component({
    selector: 'using-camera-component',
    templateUrl: 'pages/createexpense/expense-photo.html'
})

export class ExpensePhotoComponent {

    public imageTaken: ImageAsset;
    public saveToGallery: boolean = true;
    public keepAspectRatio: boolean = true;
    public width: number = 300;
    public height: number = 300;

    onTakePhoto() {
        var options = { width: this.width, height: this.height, keepAspectRatio: this.keepAspectRatio,  saveToGallery: this.saveToGallery };
        camera.takePicture(options)
            .then(imageAsset => {
                this.imageTaken = imageAsset;
                console.log("Size: " + imageAsset.options.width + "x" + imageAsset.options.height);
            }).catch(err => {
                console.log(err.message);
            })
    }

    onRequestPermissions() {
        camera.requestPermissions();
    }


    onCheckForCamera() {
        var isCameraAvailable = camera.isAvailable();
        console.log("Is camera hardware available: " + isCameraAvailable);
    }

}

这是我得到的痕迹：

java.lang.RuntimeException: Unable to resume activity {org.nativescript.finlyng/com.tns.NativeScriptActivity}:
com.tns.NativeScriptException：调用js方法onCreateView失败
TypeError: Cannot read property 'LayoutParams' of undefined
File: "/data/data/org.nativescript.finlyng/files/app/tns_modules/ui/core/view.js,
行：507，专栏：68
StackTrace: 
  Frame: function:'ViewStyler.setNativeLayoutParamsProperty', file:'/data/data/org.nativescript.finlyng/files/app/tns_modules/ui/core/view.js',
行：507，栏目：69 框架：功能：＆＃39; StylePropertyChangedHandler.applyProperty＆＃39;，file：＆＃39; /data/data/org.nativescript.finlyng/files/app/tns_modules/ui/styling/style.js'，行：1326，专栏：14 框架：功能：＆＃39; Style._applyStyleProperty＆＃39;，file：＆＃39; /data/data/org.nativescript.finlyng/files/app/tns_modules/ui/styling/style.js'，行：1086，专栏：25 框架：功能：＆＃39; Style._applyProperty＆＃39;，file：＆＃39; /data/data/org.nativescript.finlyng/files/app/tns_modules/ui/styling/style.js'， line：1049，column：14

我该如何解决这个问题？感谢

Answer 1

您的代码很好，但为了使用 FlexboxLayout 和 ImageAsset 模块，您需要在应用程序中使用tns-core-modules @（因为这些功能不正式已发布，将与NativeScript 2.4.0一起出现

请注意，您引用的示例应用程序在其package.json

中具有以下依赖关系

"tns-core-modules": "next"

尝试以这种方式更新tns-core-modules：

tns plugin remove tns-core-modules
tns plugin add tns-core-modules@next

然后删除 node_modules 和平台文件夹并重建您的应用。

Nativescript：TypeError：无法读取属性＆＃39; LayoutParams＆＃39;未定义的

1 个答案: