A {N} Image Cropping Plugin

Notes

iOS 8+

Android 17+

v2.0.0+ the version of Android Lib has changed and the cropper looks different now, hence the breaking change

Based on

TOCropViewController for iOS

uCrop for Android

Installation

Run tns plugin add nativescript-imagecropper

Screenshots

Cropper UI & End result (android)

Cropper UI (iOS)

Usage (for TS demo, please see the demo folder)

To use the image cropping module you must first require it.

var ImageCropper = require("nativescript-imagecropper").ImageCropper;

How to get the image source, from nativescript-camera plugin

var camera = require("nativescript-camera");

// You might want to request camera permissions first
// check demo folder for sample implementation

camera.takePicture({width:300,height:300,keepAspectRatio:true})
  .then((imageAsset) => {
      let source = new imageSource.ImageSource();
      source.fromAsset(imageAsset).then((source) => {
        // now you have the image source    
        // pass it to the cropper                
      });
  }).catch((err) => {
      console.log("Error -> " + err.message);
  });

Methods

show(ImageSource): Returns a cropped ImageSource

var imageCropper = new ImageCropper();
imageCropper.show(imageSource).then((args) => {
  console.dir(args);
  if(args.image !== null){
    imageView.imageSource = args.image;
  }
})
.catch(function(e){
  console.dir(e);
});

show(ImageSource,Options): Returns a cropped and resized ImageSource

var imageCropper = new ImageCropper();
imageCropper.show(imageSource,{width:300,height:300}).then((args) => {
  console.dir(args);
  if(args.image !== null){
    imageView.imageSource = args.image;
  }
})
.catch(function(e){
  console.dir(e);
});

Options

Option | Type | Description ------ | ------ | ------------------------------------------------ width | number | The width of the image you would like returned. height | number | The height of the image you would like returned. lockSquare | boolean | Pass this as true, to lock square aspect ratio on iOS, on android, this option doesn't make any difference.

Additional notes for Android

You can override library colors just specifying colors with the same names in your colors.xml file. For example:

<color name="ucrop_color_toolbar">#000000</color>

This will make toolbar color black if specified inside your App_Resources/Android/values/colors.xml file.

Android styles to customize the cropper activity/styles

   <!--uCrop Activity-->
    <color name="ucrop_color_toolbar">#FF6E40</color>
    <color name="ucrop_color_statusbar">#CC5833</color>
    <color name="ucrop_color_toolbar_widget">#fff</color>
    <color name="ucrop_color_widget">#000</color>
    <color name="ucrop_color_widget_active">#FF6E40</color>
    <color name="ucrop_color_widget_background">#fff</color>
    <color name="ucrop_color_widget_text">#000</color>
    <color name="ucrop_color_progress_wheel_line">#808080</color>
    <color name="ucrop_color_crop_background">#000</color>

    <!--Crop View-->
    <color name="ucrop_color_default_crop_grid">#80ffffff</color>
    <color name="ucrop_color_default_crop_frame">#ffffff</color>
    <color name="ucrop_color_default_dimmed">#8c000000</color>
    <color name="ucrop_color_default_logo">#4f212121</color>

Returned Result Arguments

Argument | Type | Result(s) -------- | ----------- | -------------------------------------------------------------------------- response | string | SuccessCancelledError image | ImageSource | null if there was an error or was cancelledImageSource on success

Bonus: Snippet for using with nativescript-imagepicker 6.x

const context = imagepickerModule.create({
    mode: 'single' // allow choosing single image
});
context
    .authorize()
    .then(function() {
        return context.present();
    })
    .then(function(selection) {
        selection.forEach(function(selected) {
            selected.getImageAsync(source => {
                const selectedImgSource = imageSource.fromNativeSource(source);
                imageCropper
                    .show(selectedImgSource, { width: 300, height: 300 })
                    .then(args => {
                        if (args.image !== null) {
                               // Use args.image
                        }
                    })
                    .catch(function(e) {
                        console.log(e);
                    });
            });
        });
    })
    .catch(function(e) {
        console.log(e);
    });