Swift－一步步教你上传头像

先前有人私信我说上传有问题，博主确认了下，发现是路径的问题，把Object－C的代码转变成Swift后路径就出了问题，不知道原因，推测可能是Swift本身的问题，所以博主换了一种路径方式，大家注意，关于路径和文件操作的，后面博主要写一篇博客来进行说明，有兴趣的可以看看，或者自己查查资料。

上一篇中列出了Alamofire中GET和POST的使用方法，这里来介绍如何用Alamofire以表单形式来上传头像。
前面写过一篇Object－C的上传头像，这里代码是一样的，只是语言不一样，想看的请点击这里：http://blog.csdn.net/codingfire/article/details/51781194
下面来看看用Swift怎么来上传头像：

1.可拍照，可选择相册中图片：
AlertController前面单独说过，我们不陌生，需要看的就是UIImagePickerController了，

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {        let actionSheet = UIAlertController(title: "上传头像", message: nil, preferredStyle: .ActionSheet)        let cancelBtn = UIAlertAction(title: "取消", style: .Cancel, handler: nil)        let takePhotos = UIAlertAction(title: "拍照", style: .Destructive, handler: {            (action: UIAlertAction) -> Void in//判断是否能进行拍照，可以的话打开相机            if UIImagePickerController.isSourceTypeAvailable(.Camera) {                let picker = UIImagePickerController()                picker.sourceType = .Camera                picker.delegate = self                picker.allowsEditing = true                self.presentViewController(picker, animated: true, completion: nil)            }            else            {                print("模拟其中无法打开照相机,请在真机中使用");            }        })        let selectPhotos = UIAlertAction(title: "相册选取", style: .Default, handler: {            (action:UIAlertAction)            -> Void in            //调用相册功能，打开相册            let picker = UIImagePickerController()            picker.sourceType = .PhotoLibrary            picker.delegate = self            picker.allowsEditing = true            self.presentViewController(picker, animated: true, completion: nil)        })        actionSheet.addAction(cancelBtn)        actionSheet.addAction(takePhotos)        actionSheet.addAction(selectPhotos)        self.presentViewController(actionSheet, animated: true, completion: nil)    }

2.选择一张照片后进入代理方法

 func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {        let type: String = (info[UIImagePickerControllerMediaType] as! String)        //当选择的类型是图片        if type == "public.image"        {            //修正图片的位置            let image = self.fixOrientation((info[UIImagePickerControllerOriginalImage] as! UIImage))            //先把图片转成NSData            let data = UIImageJPEGRepresentation(image, 0.5) //这里为先前的写法，在Swift中路径有变化 //--------------------------------------------------//                       **//图片保存的路径            //这里将图片放在沙盒的documents文件夹中            let DocumentsPath:String = NSHomeDirectory().stringByAppendingString("Documents")            //文件管理器            let fileManager = NSFileManager.defaultManager()            //把刚刚图片转换的data对象拷贝至沙盒中 并保存为image.png            try! fileManager.createDirectoryAtPath(DocumentsPath, withIntermediateDirectories: true, attributes: nil)            fileManager.createFileAtPath(DocumentsPath + "/image.png", contents: data, attributes: nil)            //得到选择后沙盒中图片的完整路径            let filePath = DocumentsPath + "/image.png"**//--------------------------------------------------//            //图片保存的路径            //这里将图片放在沙盒的documents文件夹中            //Home目录            let homeDirectory = NSHomeDirectory()            let documentPath = homeDirectory + "/Documents"            //文件管理器            let fileManager: NSFileManager = NSFileManager.defaultManager()            //把刚刚图片转换的data对象拷贝至沙盒中 并保存为image.png            do {                try fileManager.createDirectoryAtPath(documentPath, withIntermediateDirectories: true, attributes: nil)            }            catch let error {            }            fileManager.createFileAtPath(documentPath.stringByAppendingString("/image.png"), contents: data, attributes: nil)            //得到选择后沙盒中图片的完整路径            let filePath: String = String(format: "%@%@", documentPath, "/image.png")            print("filePath:" + filePath)            Alamofire.upload(.POST, "http://192.168.3.16:9060/client/updateHeadUrl", multipartFormData: { multipartFormData in                let lastData = NSData(contentsOfFile: filePath)                multipartFormData.appendBodyPart(data: lastData!, name: "image")                }, encodingCompletion: { response in                    picker.dismissViewControllerAnimated(true, completion: nil)                    switch response {                    case .Success(let upload, _, _):                        upload.responseJSON(completionHandler: { (response) in                            print(response)                            self.imageView.image = UIImage(data: data!)                        })                    case .Failure(let encodingError):                        print(encodingError)                    }            })        }    }

3.你会发现有时候上传的图片是旋转了90度的，下面来修正照片位置：

func fixOrientation(aImage: UIImage) -> UIImage {        // No-op if the orientation is already correct        if aImage.imageOrientation == .Up {            return aImage        }        // We need to calculate the proper transformation to make the image upright.        // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.        var transform: CGAffineTransform = CGAffineTransformIdentity        switch aImage.imageOrientation {        case .Down, .DownMirrored:            transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height)            transform = CGAffineTransformRotate(transform, CGFloat(M_PI))        case .Left, .LeftMirrored:            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0)            transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2))        case .Right, .RightMirrored:            transform = CGAffineTransformTranslate(transform, 0, aImage.size.height)            transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2))        default:            break        }        switch aImage.imageOrientation {        case .UpMirrored, .DownMirrored:            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0)            transform = CGAffineTransformScale(transform, -1, 1)        case .LeftMirrored, .RightMirrored:            transform = CGAffineTransformTranslate(transform, aImage.size.height, 0)            transform = CGAffineTransformScale(transform, -1, 1)        default:            break        }        // Now we draw the underlying CGImage into a new context, applying the transform        // calculated above.        //这里需要注意下CGImageGetBitmapInfo，它的类型是Int32的，CGImageGetBitmapInfo(aImage.CGImage).rawValue，这样写才不会报错        let ctx: CGContextRef = CGBitmapContextCreate(nil, Int(aImage.size.width), Int(aImage.size.height), CGImageGetBitsPerComponent(aImage.CGImage), 0, CGImageGetColorSpace(aImage.CGImage), CGImageGetBitmapInfo(aImage.CGImage).rawValue)!        CGContextConcatCTM(ctx, transform)        switch aImage.imageOrientation {        case .Left, .LeftMirrored, .Right, .RightMirrored:            // Grr...            CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.height, aImage.size.width), aImage.CGImage)        default:            CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.width, aImage.size.height), aImage.CGImage)        }        // And now we just create a new UIImage from the drawing context        let cgimg: CGImageRef = CGBitmapContextCreateImage(ctx)!        let img: UIImage = UIImage(CGImage: cgimg)        return img    }

以上方法亲测无误，需要的小伙伴放入正确的地址来进行测试。
Demo下载地址：https://github.com/codeliu6572/Swift_upload_headerImage