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
