多媒体应用-swift

照片选择主要是通过UIImagePickerController控制器实例化一个对象，然后通过self.PresentViewController方法推出界面显示。需要实现代理UIImagePickerControllerDelegate，UINavigationControllerDelegate。

通过isSourceTypeAvailable方法判断设置是否支持照相机、图片库、相册功能。

使用相册功能主要以下一个步骤：

1）判断是否支持要使用的图片库或相机功能；

2）初始化图片控制器对象；

3）指定图片控制器对象的代理；

4）指定图片控制器类型；

5）弹出显示图片控制器；

6）实现图片控制器代理方法。

    // MARK: - 选择照片
    /*----- 选择照片 ------*/
    @IBAction func addImageButtonClick()
    {
        let actionSheet = UIActionSheet(title: "请选择", delegate: self, cancelButtonTitle: "取消", destructiveButtonTitle: nil, otherButtonTitles: "从相册选","拍照")
        actionSheet.showInView(self.view)
    }

    // MARK: - UIActionSheetDelegate
    func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int)
    {
        if buttonIndex != actionSheet.cancelButtonIndex
        {
            if buttonIndex == 1  //从相册选
            {
                self.fromAlbum()
            }else if buttonIndex == 2 //拍照
            {
                self.fromPhotograph()
            }
        }
    }

// MARK: - 选取相册
    func fromAlbum()
    {
        //判断设置是否支持图片库
        if UIImagePickerController.isSourceTypeAvailable(.PhotoLibrary)
        {
            //初始化图片控制器
            let picker = UIImagePickerController()
            
            //设置代理
            picker.delegate = self
            
            //设置媒体类型
            picker.mediaTypes = [kUTTypeImage as String,kUTTypeVideo as String]
            
            //设置允许编辑
            picker.allowsEditing = true
            
            //指定图片控制器类型
            picker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
            
            //弹出控制器，显示界面
            self.presentViewController(picker, animated: true, completion: { () -> Void in
                
            })
            
        }
        else
        {
            let aler = UIAlertView(title: "读取相册错误!", message: nil, delegate: nil, cancelButtonTitle: "确定")
            aler.show()
        }
    }

// MARK: - 拍照
    func fromPhotograph()
    {
        if UIImagePickerController.isSourceTypeAvailable(.Camera)
        {
            //创建图片控制器
            let picker = UIImagePickerController()
            
            //设置代理
            picker.delegate = self
            
            //设置来源
            picker.sourceType = UIImagePickerControllerSourceType.Camera
            
            
            //设置镜头
            if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front)
            {
                picker.cameraDevice = UIImagePickerControllerCameraDevice.Front
            }
            
            //设置闪光灯
            picker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.On
            
            //允许编辑
            picker.allowsEditing = true;
            
            //打开相机
            self.presentViewController(picker, animated: true, completion: { () -> Void in
                
            })
            
        }
        else
        {
            let aler = UIAlertView(title: "找不到相机!", message: nil, delegate: nil, cancelButtonTitle: "确定")
            aler.show()
        }
    }

// MARK: - UIImagePickerControllerDelegate
    
    //选择图片成功之后代理
    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
        //查看info对象
        print(info)
        
        //获取选择的原图
        let image = info[UIImagePickerControllerOriginalImage] as! UIImage
        
        //赋值，图片视图显示图片
        picView.image = image
        
        //图片控制器退出
        picker.dismissViewControllerAnimated(true, completion: { () -> Void in
            
        })
    }
    
    //取消图片控制器代理
    func imagePickerControllerDidCancel(picker: UIImagePickerController)
    {
        //图片控制器退出
        picker.dismissViewControllerAnimated(true, completion: { () -> Void in
            
        })
    }

 可以通过引入MobileCoreServices.framework，来设置mediaTypes属性设置媒体的类型。