ios手機豎屏拍照旋轉問題
阿新 • • 發佈：2018-12-03
ios拍照上傳經常會出現上傳的圖片被旋轉了，不是我們想要的角度，可以對齊進行調整
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> <title>ios手機豎屏拍照旋轉問題</title> <script src="http://static.wanlianjin.com/data/m/wlcs/js/nocar/jquery-1.7.2.min.js" type="text/javascript" charset="utf-8"></script> <script type="text/javascript" src="js/html/exif.js" ></script> </head> <body> <div style="height: 50px; line-height: 50px;text-align: center;border-bottom: 1px solid #171E28;"> 上傳圖片: <input type="file" accept="image/*" id="uploadImage" capture="camera" onchange="selectFileImage(this);" /> </div> <div style="margin-top: 10px;width:400px"> <img alt="preview" src="" id="myImage" style="width:100%"/> </div> </body> </html> <script> //uploadImage.js如下： function selectFileImage(fileObj) { var file = fileObj.files['0']; //圖片方向角 added by lzk var Orientation = null; if (file) { console.log("正在上傳,請稍後..."); var rFilter = /^(image\/jpeg|image\/png)$/i; // 檢查圖片格式 if (!rFilter.test(file.type)) { //showMyTips("請選擇jpeg、png格式的圖片", false); return; } // var URL = URL || webkitURL; //獲取照片方向角屬性，使用者旋轉控制 EXIF.getData(file, function() { EXIF.getAllTags(this); 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; //修復ios if (navigator.userAgent.match(/iphone/i)) { console.log('iphone'); //alert(expectWidth + ',' + expectHeight); //如果方向角不為1，都需要進行旋轉 added by lzk if(Orientation != "" && Orientation != 1){ alert('旋轉處理'); switch(Orientation){ case 6://需要順時針（向左）90度旋轉 alert('需要順時針（向左）90度旋轉'); rotateImg(this,'left',canvas); break; case 8://需要逆時針（向右）90度旋轉 alert('需要順時針（向右）90度旋轉'); rotateImg(this,'right',canvas); break; case 3://需要180度旋轉 alert('需要180度旋轉'); rotateImg(this,'right',canvas);//轉兩次 rotateImg(this,'right',canvas); break; } } /*var mpImg = new MegaPixImage(image); mpImg.render(canvas, { maxWidth: 800, maxHeight: 1200, quality: 0.8, orientation: 8 });*/ base64 = canvas.toDataURL("image/jpeg", 0.8); }else if (navigator.userAgent.match(/Android/i)) {// 修復android alert(Orientation) var encoder = new JPEGEncoder(); base64 = encoder.encode(ctx.getImageData(0, 0, expectWidth, expectHeight), 80); }else{ //alert(Orientation); if(Orientation != "" && Orientation != 1){ //alert('旋轉處理'); switch(Orientation){ case 6://需要順時針（向左）90度旋轉 alert('需要順時針（向左）90度旋轉'); rotateImg(this,'left',canvas); break; case 8://需要逆時針（向右）90度旋轉 alert('需要順時針（向右）90度旋轉'); rotateImg(this,'right',canvas); break; case 3://需要180度旋轉 alert('需要180度旋轉'); rotateImg(this,'right',canvas);//轉兩次 rotateImg(this,'right',canvas); break; } } base64 = canvas.toDataURL("image/jpeg", 0.8); } //uploadImage(base64); $("#myImage").attr("src", base64); }; }; oReader.readAsDataURL(file); } } //對圖片旋轉處理 added by lzk www.bcty365.com function rotateImg(img, direction,canvas) { //alert(img); //最小與最大旋轉方向，圖片旋轉4次後回到原方向 var min_step = 0; var max_step = 3; //var img = document.getElementById(pid); if (img == null)return; //img的高度和寬度不能在img元素隱藏後獲取，否則會出錯 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++; //旋轉到原位置，即超過最大值 step > max_step && (step = min_step); } else { step--; step < min_step && (step = max_step); } //img.setAttribute('step', step); /*var canvas = document.getElementById('pic_' + pid); if (canvas == null) { img.style.display = 'none'; canvas = document.createElement('canvas'); canvas.setAttribute('id', 'pic_' + pid); img.parentNode.appendChild(canvas); } */ //旋轉角度以弧度值為引數 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>