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解决ios横屏拍照图片自动旋转90度问题
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title>图片上传</title>
<script src="https://cdn.bootcss.com/exif-js/2.3.0/exif.min.js"></script>
<style>
* {
margin: 0;
padding: 0;
}
#app,body,html {
height: 100%
}
body {
font-size: 12px;
-webkit-tap-highlight-color: transparent;
font-family: Helvetica, Arial, sans-serif;
}
</style>
</head>
<body> <div style="height: 50px; line-height: 50px;text-align: center;border-bottom: 1px solid #171E28;">
上传图片:
<input type="file" accept="image/png, image/jpeg, image/jpg" id="uploadImage" onchange="selectFileImage(this);" />
</div>
<img style="width:100%;" id="myImage"/ alt="preview" src=""> <!-- 微信SDK -->
<script src="https://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script>
<!-- 引入zepto -->
<script src="https://cdn.bootcss.com/zepto/1.2.0/zepto.min.js"></script>
<script> function selectFileImage(fileObj) {
var file = fileObj.files['0'];
//图片方向角 added by lzk
var Orientation = null; if (file) {
console.log("正在上传,请稍后...");
var rFilter = /^(image\/jpeg|image\/png)$/i; // 检查图片格式
if (!rFilter.test(file.type)) {
//showMyTips("请选择jpeg、png格式的图片", false);
return;
}
// var URL = URL || webkitURL;
//获取照片方向角属性，用户旋转控制
EXIF.getData(file, function() {
// alert(EXIF.pretty(this));
EXIF.getAllTags(this);
//alert(EXIF.getTag(this, 'Orientation'));
Orientation = EXIF.getTag(this, 'Orientation');
//return;
}); var oReader = new FileReader();
oReader.onload = function(e) {
//var blob = URL.createObjectURL(file);
//_compress(blob, file, basePath);
var image = new Image();
image.src = e.target.result;
image.onload = function() {
var expectWidth = this.naturalWidth;
var expectHeight = this.naturalHeight; if (this.naturalWidth > this.naturalHeight && this.naturalWidth > 800) {
expectWidth = 800;
expectHeight = expectWidth * this.naturalHeight / this.naturalWidth;
} else if (this.naturalHeight > this.naturalWidth && this.naturalHeight > 1200) {
expectHeight = 1200;
expectWidth = expectHeight * this.naturalWidth / this.naturalHeight;
}
var canvas = document.createElement("canvas");
var ctx = canvas.getContext("2d");
canvas.width = expectWidth;
canvas.height = expectHeight;
ctx.drawImage(this, 0, 0, expectWidth, expectHeight);
var base64 = null;
//修复ios
if (navigator.userAgent.match(/iphone/i)) {
console.log('iphone');
//alert(expectWidth + ',' + expectHeight);
//如果方向角不为1，都需要进行旋转 added by lzk
if(Orientation != "" && Orientation != 1){
alert('旋转处理');
switch(Orientation){
case 6://需要顺时针（向左）90度旋转
alert('需要顺时针（向左）90度旋转');
rotateImg(this,'left',canvas);
break;
case 8://需要逆时针（向右）90度旋转
alert('需要顺时针（向右）90度旋转');
rotateImg(this,'right',canvas);
break;
case 3://需要180度旋转
alert('需要180度旋转');
rotateImg(this,'right',canvas);//转两次
rotateImg(this,'right',canvas);
break;
}
} }base64 = canvas.toDataURL("image/jpeg",0.8)
document.getElementById('myImage').src = base64
};
};
oReader.readAsDataURL(file);
}
} //对图片旋转处理 added by lzk
function rotateImg(img, direction,canvas) {
//alert(img);
//最小与最大旋转方向，图片旋转4次后回到原方向
var min_step = 0;
var max_step = 3;
//var img = document.getElementById(pid);
if (img == null)return;
//img的高度和宽度不能在img元素隐藏后获取，否则会出错
var height = img.height;
var width = img.width;
//var step = img.getAttribute('step');
var step = 2;
if (step == null) {
step = min_step;
}
if (direction == 'right') {
step++;
//旋转到原位置，即超过最大值
step > max_step && (step = min_step);
} else {
step--;
step < min_step && (step = max_step);
} //旋转角度以弧度值为参数
var degree = step * 90 * Math.PI / 180;
var ctx = canvas.getContext('2d');
switch (step) {
case 0:
canvas.width = width;
canvas.height = height;
ctx.drawImage(img, 0, 0);
break;
case 1:
canvas.width = height;
canvas.height = width;
ctx.rotate(degree);
ctx.drawImage(img, 0, -height);
break;
case 2:
canvas.width = width;
canvas.height = height;
ctx.rotate(degree);
ctx.drawImage(img, -width, -height);
break;
case 3:
canvas.width = height;
canvas.height = width;
ctx.rotate(degree);
ctx.drawImage(img, -width, 0);
break;
}
}
</script>
</body> </html>
