Swift中设置头像（拍照、相册、本地）

在这里我是用button来显示头像。所以定义一个avatarBtn,创建一个延迟加载的pickView。然后avatarData是用来保存及接受本地数据的，需要把头像保存到本地的可以用到。
在这里要注意的是在storyboard里面已经设置avatarBtn的形状为圆形了，也可以通过设置avatarBtn的layer.cornerRadius来设置圆角大小

@IBOutlet weak var avatarBtn: UIButton!
private lazy var pickVC: UIImagePickerController = {
    let pickVC = UIImagePickerController()
    pickVC.delegate = self
    pickVC.allowsEditing = true
    return pickVC
}()
private var avatarData: NSData?

在viewDidLoad里面先获取本地头像文件，如果有的话就设置图片，其中，imagewithClipImage的作用是设置图片周围有2个像素的白色圆圈。

override func viewDidLoad() {
    super.viewDidLoad()
    addLeftItemButton()
    // Do any additional setup after loading the view.
    if  let data = FileOP.unarchive(kAvatarFileName) as? NSData {
        let image = UIImage.imageWithClipImage(UIImage(data: data)!, borderWidth: 2, borderColor: UIColor.whiteColor())
        avatarBtn.setImage(image, forState: .Normal)
    }
}

点击头像按钮，响应事件，用alertController来作为选择项

@IBAction func clickAvatarEvent(sender: AnyObject) {
    nameField.resignFirstResponder()
    let iconActionSheet: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)
    iconActionSheet.addAction(UIAlertAction(title:"Camera", style: UIAlertActionStyle.Default, handler: { (UIAlertAction) in
        self.openCamera()
        
    }))
    iconActionSheet.addAction(UIAlertAction(title:"Photo", style: UIAlertActionStyle.Default, handler: { (UIAlertAction) in
        self.openPhotoLibrary()
        
    }))
    iconActionSheet.addAction(UIAlertAction(title:"Cancel", style: UIAlertActionStyle.Cancel, handler:nil))
    self.presentViewController(iconActionSheet, animated: true, completion: nil)

}

然后就是imagePicker的delegate

   //MARK:-- imagePicker delegate
extension SSTMyProfileVC:  UIImagePickerControllerDelegate,UINavigationControllerDelegate {
//打开相机
private func openCamera() {
    if UIImagePickerController.isSourceTypeAvailable(.Camera) {
        pickVC.sourceType = .Camera
        self.presentViewController(pickVC, animated: true, completion: nil)
    } else {
        SVProgressHUD.showErrorWithStatus("This camera is invalid!")
    }
}

//打开相册
private func openPhotoLibrary() {
    pickVC.sourceType = .PhotoLibrary
    pickVC.allowsEditing = true
    presentViewController(pickVC, animated: true, completion: nil)
}

在这个完成选择的回调里面做的几个操作是把图片缩小，然后保存图片到本地，最后设置avatarBtn的图片

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    if let typeStr = info[UIImagePickerControllerMediaType] as? String {
        if typeStr == "public.image" {
            if let image = info[UIImagePickerControllerEditedImage] as? UIImage {
                let smallImage = UIImage.imageClipToNewImage(image, newSize:CGSize(width: 90, height: 90 ))
                if UIImagePNGRepresentation(smallImage) == nil {
                    avatarData = UIImageJPEGRepresentation(smallImage, 0.8)
                } else {
                    avatarData = UIImagePNGRepresentation(smallImage)
                }
                if avatarData != nil {
                    //save to local
                    FileOP.archive(kAvatarFileName, object: avatarData!)
                    //设置avatar圆角边缘颜色及宽度
                    let image = UIImage.imageWithClipImage(UIImage(data: avatarData!)!, borderWidth: 2, borderColor: UIColor.whiteColor())
                    avatarBtn.setImage(image, forState: .Normal)
                } else {
                    SVProgressHUD.showErrorWithStatus("save photo failure")
                }
            }
        }
    } else {
        SVProgressHUD.showErrorWithStatus("get photo failure")
    }
    picker.dismissViewControllerAnimated(true, completion: nil)
}

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