介绍

编辑用户头像是帐号编辑功能的必备功能之一，现在Swift实现的头像选择还不多，这里给大家简单介绍一下

实现

在viewDidLoad中为头像添加点击手势响应

UIImageView默认不支持交互，我们先要允许它交互，需要为它添加一个TapGestureRecognizer

override func viewDidLoad() {        super.viewDidLoad()        //设置头像圆角        icon.layer.cornerRadius = icon.frame.width/2        //设置遮盖额外部分,下面两句的意义及实现是相同的         //icon.clipsToBounds = true        icon.layer.masksToBounds = true                //为头像添加点击事件        icon.userInteractionEnabled=true        let userIconActionGR = UITapGestureRecognizer()        userIconActionGR.addTarget(self, action: Selector("selectIcon"))        icon.addGestureRecognizer(userIconActionGR)                //从文件读取用户头像        let fullPath = ((NSHomeDirectory() as NSString) .stringByAppendingPathComponent("Documents") as NSString).stringByAppendingPathComponent(iconImageFileName)        //可选绑定,若保存过用户头像则显示之        if let savedImage = UIImage(contentsOfFile: fullPath){            self.icon.image = savedImage        }            }

弹出一个AlertController让用户选择

//选择头像的函数    func selectIcon(){        let userIconAlert = UIAlertController(title: "请选择操作", message: "", preferredStyle: UIAlertControllerStyle.ActionSheet)                let chooseFromPhotoAlbum = UIAlertAction(title: "从相册选择", style: UIAlertActionStyle.Default, handler: funcChooseFromPhotoAlbum)        userIconAlert.addAction(chooseFromPhotoAlbum)                let chooseFromCamera = UIAlertAction(title: "拍照", style: UIAlertActionStyle.Default,handler:funcChooseFromCamera)        userIconAlert.addAction(chooseFromCamera)                let canelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel,handler: nil)        userIconAlert.addAction(canelAction)                self.presentViewController(userIconAlert, animated: true, completion: nil)    }

根据不同的选择弹出UIImagePickerController

要使用UIImagePickerController,首先要继承UIImagePickerControllerDelegate, UINavigationControllerDelegate

//从相册选择照片    func funcChooseFromPhotoAlbum(avc:UIAlertAction) -> Void{        let imagePicker = UIImagePickerController()        //设置代理        imagePicker.delegate = self        //允许编辑        imagePicker.allowsEditing = true        //设置图片源        imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary        //模态弹出IamgePickerView        self.presentViewController(imagePicker, animated: true, completion: nil)    }

//拍摄照片func funcChooseFromCamera(avc:UIAlertAction) -> Void{    let imagePicker = UIImagePickerController()    //设置代理    imagePicker.delegate = self    //允许编辑    imagePicker.allowsEditing=true    //设置图片源    imagePicker.sourceType = UIImagePickerControllerSourceType.Camera    //模态弹出IamgePickerView    self.presentViewController(imagePicker, animated: true, completion: nil)}

func imagePickerControllerDidCancel(picker: UIImagePickerController){    picker.dismissViewControllerAnimated(true, completion: nil)}

实现UIImagePickerDelegate方法

//UIImagePicker回调方法    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {        //获取照片的原图        //let image = (info as NSDictionary).objectForKey(UIImagePickerControllerOriginalImage)        //获得编辑后的图片        let image = (info as NSDictionary).objectForKey(UIImagePickerControllerEditedImage)        //保存图片至沙盒        self.saveImage(image as! UIImage, imageName: iconImageFileName)        let fullPath = ((NSHomeDirectory() as NSString).stringByAppendingPathComponent("Documents") as NSString).stringByAppendingPathComponent(iconImageFileName)        //存储后拿出更新头像        let savedImage = UIImage(contentsOfFile: fullPath)        self.icon.image=savedImage        picker.dismissViewControllerAnimated(true, completion: nil)    }

保存图片到沙盒

//MARK: - 保存图片至沙盒    func saveImage(currentImage:UIImage,imageName:String){        var imageData = NSData()        imageData = UIImageJPEGRepresentation(currentImage, 0.5)!        // 获取沙盒目录        let fullPath = ((NSHomeDirectory() as NSString).stringByAppendingPathComponent("Documents") as NSString).stringByAppendingPathComponent(imageName)        // 将图片写入文件        imageData.writeToFile(fullPath, atomically: false)    }

更换效果