前言

因为APP里面有一个类似于朋友圈的功能，需要给用户提供拍照或者选择本地照片然后发布的能力，我们今天就来讲一下如何在Ionic2 APP中实现调用本地摄像头的功能。不过注意，因为是涉及到客户端的，单纯的网页版是没有权限完成该功能的，所以本功能只有在Android或iOS客户端版本才可以用。

步骤

1、按照惯例安装Cordova插件

Image Picker（相册选择）

ionic plugin add https://github.com/Telerik-Verified-Plugins/ImagePicker

Camera（拍照）

ionic plugin add cordova-plugin-camera

Transfer（上传文件）

ionic plugin add cordova-plugin-file-transfer

2、通过摄像头上传文件的函数

  //
  // upload imgs by native camera
  uploadImgsByNativeCamera(type) {
    let options = {
      quality: 60,
      saveToPhotoAlbum: true,
      sourceType: 1,
      mediaType: 0,
      targetWidth: 1200,
      targetHeight: 1600,
    };
    if (type === 'library') {
      options.quality = 100;
      options.saveToPhotoAlbum = false;
      options.sourceType = 0;
      options.mediaType = 2;
    }

    Camera.getPicture(options).then((result) => {
      this.waiting = true;

      this.heyApp.utilityComp.presentLoading();
      console.log('the file', result);
      this.uploadFileByFileTransfer(result, this.heyApp.fileUploadService.imageUploadAPI);
    }, (err) => {
      console.log('Camera getPictures err', err);
    });
  }

  //
  // upload imgs by file transfer
  uploadFileByFileTransfer(file, api) {
    const fileTransfer = new Transfer();
    let options: any;
    options = {
      fileKey: 'file',
      fileName: file.replace(/^.*[\\\/]/, ''),
      headers: {},
    }

    fileTransfer.upload(file, api, options)
      .then((ret) => {
        this.waiting = false;

        this.heyApp.utilityComp.dismissLoading();
        let result = [{"uri": ret.response}];
        // merge imgs
        this.mergeImgs(result);
      }, (err) => {
        this.heyApp.utilityComp.dismissLoading();
        this.waiting = false;
      })
  }

3、通过选择本地相册上传文件的函数

  //
  // upload imgs by native library
  uploadImgsByNativeLibrary() {
    let options = {
      width: 1200,
      height: 1600,
    };
    ImagePicker.getPictures(options).then((results) => {
      this.waiting = true;


      for (var i = 0; i < results.length; i++) {
        this.heyApp.utilityComp.presentLoading();
        this.uploadFileByFileTransfer(results[i], this.heyApp.fileUploadService.imageUploadAPI);
      }
    }, (err) => {
      console.log('ImagePIcker getPictures err', err);
    });
  }

  //
  // upload imgs by file transfer
  uploadFileByFileTransfer(file, api) {
    const fileTransfer = new Transfer();
    let options: any;
    options = {
      fileKey: 'file',
      fileName: file.replace(/^.*[\\\/]/, ''),
      headers: {},
    }

    fileTransfer.upload(file, api, options)
      .then((ret) => {
        this.waiting = false;

        this.heyApp.utilityComp.dismissLoading();
        let result = [{"uri": ret.response}];

      }, (err) => {
        this.heyApp.utilityComp.dismissLoading();
        this.waiting = false;
      })
  }

4、业务逻辑只需要调用以上两个函数便可实现拍照上传的功能

最后

如果有兴趣，可以自己动手做一个图片裁剪的功能。