ios手机竖屏拍照旋转问题

系统管理员 2022-04-12 11:47 419阅读 0赞

ios拍照上传经常会出现上传的图片被旋转了，不是我们想要的角度，可以对齐进行调整

<!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手机竖屏拍照旋转问题</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;"> 
                上传图片: 
                <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']; 
        //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() { 
                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; 
                            }        
                        } 
                         
                        /*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)) {// 修复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); 
                    } 
                    //uploadImage(base64); 
                    $("#myImage").attr("src", base64); 
                }; 
            }; 
            oReader.readAsDataURL(file); 
        } 
    } 
     
    //对图片旋转处理 added by lzk www.bcty365.com 
    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);   
            }   
            //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>

git地址：[https://github.com/zhangstar1331/upload-picture.git][https_github.com_zhangstar1331_upload-picture.git]

[https_github.com_zhangstar1331_upload-picture.git]: https://github.com/zhangstar1331/upload-picture.git