我从设备获取图像并使用Pixi JS绘制带过滤器的画布.它可以很好地利用计算机来获取图像.但是,当我在
IOS上时,它会抛出错误,例如交叉原点问题,或者我正在尝试使用未知格式.
这是我用来绘制图像的代码(适用于web /桌面但不适用于cordova内置的ios应用程序)
_renderImage() {
let wWidth;
if (window.outerWidth > 414) {
wWidth = 414;
} else {
wWidth = window.outerWidth;
}
const img = new Image();
img.src = this.state.avatarSource;
let lower;
if (img.width > img.height) {
lower = img.height;
} else {
lower = img.width;
}
const canvas = this.refs.canvasimg;
if (canvas.hasChildNodes()) {
canvas.removeChild(canvas.childNodes[0]);
}
const renderer = PIXI.autoDetectRenderer(wWidth, wWidth * 1.25, {transparent: true});
const stage = new PIXI.Container();
canvas.appendChild(renderer.view);
// create a PIXI sprite from an image path
const canvasImg = PIXI.Sprite.fromImage(this.state.avatarSource);
canvasImg.anchor.x = 0;
canvasImg.anchor.y = 0;
canvasImg.width = wWidth;
canvasImg.height = wWidth * 1.25;
const filter = this._getImageFilter();
stage.filters = [filter];
stage.addChild(canvasImg);
render();
function render(){
requestAnimationFrame(render);
renderer.render(stage);
}
}
这是我用来使用cordova相机插件选择图像的代码:
_getPhoto(isPhotosLib) {
const captureSuccess = (imageData) => {
this.m.setState({
// avatarSource: `data:image/jpeg;base64,${imageData}`
avatarSource: imageData
})
};
const captureError = (error) => {
navigator.notification.alert('Error code: ' + error.code, null, 'Capture Error');
};
let options = {
quality: 100,
targetWidth: 640,
targetHeight: 640,
saveToPhotoAlbum: false,
destinationType: Camera.DestinationType.FILE_URI,
popoverOptions: new CameraPopoverOptions(640, 640, 100, 100, Camera.PopoverArrowDirection.ARROW_ANY)
}
isPhotosLib ? options.sourceType = Camera.PictureSourceType.PHOTOLIBRARY : null;
navigator.camera.getPicture(captureSuccess, captureError, options);
}
我得到的错误是这样的:
Failed to load resource: Origin null is not allowed by Access-Control-Allow-Origin.
在XCode上:
[Generic] Creating an image format with an unknown type is an error
当我更改为NATIVE_URI时,它会记录此错误:
Failed to load resource: unsupported URL
assets-library://asset/asset.JPG?id=2DDAD0CF-2F82-40A0-B84B-398C996AC749&ext=JPG
那么它可能是什么原因,它不适用于ios?
最佳答案 查看关于
Cordova Whitelist Plugin的这篇文章,它解决了我的大多数问题.
我不知道你是否使用任何WKWebView插件,但cordova-wkwebview-engine插件支持一些iOS特定的应用程序传输安全设置以及
https://github.com/apache/cordova-plugin-wkwebview-engine.
另一种解决方法是使用HTML输入标记来启动摄像头捕获:
<input type="file" capture="camera" accept="image/*" />
只需听听“改变”事件.