swift-获取系统相册中图片

//
//  ViewController.swift
//  
//
//  Created by  on 2016/10/17.
//  Copyright © 2016年 . All rights reserved.
//

import UIKit

class ViewController: UIViewController,     UIImagePickerControllerDelegate,
    UINavigationControllerDelegate {

@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var editSwitch: UISwitch!

override func viewDidLoad() {
    super.viewDidLoad()
}

//选取相册
@IBAction func fromAlbum(_ sender: AnyObject) {
    //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
        //指定图片控制器类型
        picker.sourceType = UIImagePickerControllerSourceType.photoLibrary
        //设置是否允许编辑
        picker.allowsEditing = editSwitch.isOn
        //弹出控制器，显示界面
        self.present(picker, animated: true, completion: {
            () -> Void in
        })
    }else{
        print("读取相册错误")
    }
    
}

//选择图片成功后代理
func imagePickerController(_ picker: UIImagePickerController,
                           didFinishPickingMediaWithInfo info: [String : Any]) {
    //查看info对象
    print(info)
    
    //显示的图片
    let image:UIImage!
    if editSwitch.isOn {
        //获取编辑后的图片
        image = info[UIImagePickerControllerEditedImage] as! UIImage
    }else{
        //获取选择的原图
        image = info[UIImagePickerControllerOriginalImage] as! UIImage
    }
    
    imageView.image = image
    //图片控制器退出
    picker.dismiss(animated: true, completion: {
        () -> Void in
    })
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}
}