Swift - 从相册中选择视频（过滤掉照片，使用UIImagePickerController）

（本文代码已升级至Swift4）

有时我们需要从系统相册中选择视频录像，来进行编辑或者上传操作，这时使用 UIImagePickerController 就可以实现。

默认情况下，UIImagePickerController 打开系统“照片”后允许用户选择所有的媒体文件（不管是照片还是录像），我们可以通过 mediaTypes 属性设置。让其只显示视频录像。

1，样例说明

（1）下面样例点击“选择视频”按钮后，会自动打开相册选择视频。

（2）由于设置了 mediaTypes，所有的图片都会过滤掉，只留下视频选择。

（3）选择完毕，系统会自动将视频复制一个到应用的 tmp 文件夹（临时文件夹）下。我们可以直接对这个文件进行操作，而不会影响到系统相册中的原视频。

（4）本样例选择后，就直接使用 AVPlayerViewController 进行播放。

2，效果图

  

可以看到选择后，视频会被复制到 tmp 目录下：

选择完毕后自动播放该视频：

3，样例代码

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import UIKit import MobileCoreServices import AssetsLibrary import AVKit import AVFoundation class ViewController: UIViewController,  UIImagePickerControllerDelegate, UINavigationControllerDelegate{ override func viewDidLoad() { super.viewDidLoad() //创建一个ContactAdd类型的按钮 let button:UIButton = UIButton(type:.system) button.frame = CGRect(x:10, y:150, width:100, height:30) button.setTitle("选择视频", for:.normal) button.addTarget(self, action:#selector(selectVideo), for:.touchUpInside) self.view.addSubview(button) } //选择视频 @objc func selectVideo() { if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) { //初始化图片控制器 let imagePicker = UIImagePickerController() //设置代理 imagePicker.delegate = self //指定图片控制器类型 imagePicker.sourceType = .photoLibrary //只显示视频类型的文件 imagePicker.mediaTypes = [kUTTypeMovie as String] //不需要编辑 imagePicker.allowsEditing = false //弹出控制器，显示界面 self.present(imagePicker, animated: true, completion: nil) } else { print("读取相册错误") } } //选择视频成功后代理 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { //获取视频路径（选择后视频会自动复制到app临时文件夹下） let videoURL = info[UIImagePickerControllerMediaURL] as! URL let pathString = videoURL.relativePath print("视频地址：\(pathString)") //图片控制器退出 self.dismiss(animated: true, completion: {}) //播放视频文件 reviewVideo(videoURL) } //视频播放 func reviewVideo(_ videoURL: URL) { //定义一个视频播放器，通过本地文件路径初始化 let player = AVPlayer(url: videoURL) let playerViewController = AVPlayerViewController() playerViewController.player = player self.present(playerViewController, animated: true) { playerViewController.player!.play() } } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } }

原文出自：www.hangge.com  转载请保留原文链接：http://www.hangge.com/blog/cache/detail_1192.html

Swift3.0：照片选择

一、介绍

图片选择或者拍照功能：

1、选择相册中的图片或是拍照，都是通过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。但是使用presentViewController的类需要实现UIImagePickerControllerDelegate、UINavigationController两个代理。

2、UIImagePickerController可以通过isSourceTypeAvailable方法来判断设备是否支持照相机/图片库/相册功能。如果支持，可以通过sourceType属性来设置图片控制器的显示类型。类型一共分为3种：PhotoLibrary(照片库)、Camera(相机)、SavedPhotoAlbum(相册)

3、实现协议截图

二、实例

1、使用相册选择步骤:

• 判断是否支持要使用的图片库或相册功能
• 初始化图片控制器对象
• 指定图片控制器对象的代理
• 指定图片控制器的类型,前提是必须先导入MobileCoreServices.framework框架
• 弹出显示图片控制器
• 实现图片控制住器代理方法

func chooseImageFromAlbum(){

//判断是否支持要使用的图片库

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 = .photoLibrary

//弹出控制器,显示界面

self.present(picker, animated: true, completion: nil)

}

else{

let alert = UIAlertView.init(title: "读取相册错误!", message: nil, delegate: nil, cancelButtonTitle: "确定")

alert.show()

}

}

//实现图片控制器代理方法

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

//查看info对象

print(info)

//获取选择的原图

let originImage = info[UIImagePickerControllerOriginalImage] as! UIImage

//赋值，图片视图显示图片

self.pickerView.image = originImage

//图片控制器退出

picker.dismiss(animated: true, completion: nil)

}

//取消图片控制器代理

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {

//图片控制器退出

picker.dismiss(animated: true, completion: nil)

}

2、拍照步骤:

• 判断是否支持拍照功能
• 初始化图片控制器对象(可以设置是否允许编辑)
• 指定图片控制器对象的代理
• 指定图片控制器的类型
• 弹出显示图片控制器

func takePhotoFromCamera() {

//判断是否支持相机

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]

//设置来源

picker.sourceType = UIImagePickerControllerSourceType.camera

//设置镜头 front:前置摄像头  Rear:后置摄像头

if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.front) {

picker.cameraDevice = UIImagePickerControllerCameraDevice.front

}

//设置闪光灯(On:开、Off:关、Auto:自动)

picker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.on

//允许编辑

picker.allowsEditing = true

//打开相机

self.present(picker, animated: true, completion: nil)

}

else{

let alert = UIAlertView.init(title: "找不到相机!", message: nil, delegate: nil, cancelButtonTitle: "确定")

alert.show()

}

}

程序猿神奇的手，每时每刻，这双手都在改变着世界的交互方式！

//

//  ViewController.swift

//  SwiftExample

//

//  Created by administrator on 2019/2/15.

//  Copyright © 2019 administrator. All rights reserved.

//

import UIKit

import AVFoundation

import MobileCoreServices

import AssetsLibrary

import AVKit

class ViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {

func isCameraAvailable() -> Bool {

return UIImagePickerController.isSourceTypeAvailable(.camera)

}

func cameraSuportsMedia(mediaType:String, sourceType: UIImagePickerController.SourceType) -> Bool {

let availabelMediaTypes = UIImagePickerController.availableMediaTypes(for: sourceType)

for type in availabelMediaTypes! {

if type == mediaType{

return true

}

}

return false

}

func doesCameraSupportShootingVideos() -> Bool {

return cameraSuportsMedia(mediaType: (kUTTypeMovie as NSString) as String, sourceType: .camera)

}

func doesCameraSupportTakingPhotos() -> Bool {

return cameraSuportsMedia(mediaType: (kUTTypeImage as NSString) as String, sourceType: .camera)

}

func isFrontCameraAvailable() -> Bool {

return UIImagePickerController.isCameraDeviceAvailable(.front)

}

func isRearCameraAvailable() -> Bool {

return UIImagePickerController.isCameraDeviceAvailable(.rear)

}

func isFlashAvailableOnFrontCamera() -> Bool {

return UIImagePickerController.isFlashAvailable(for: .front)

}

func isFlashAvailableOnRearCamera() -> Bool {

return UIImagePickerController.isFlashAvailable(for: .rear)

}

//确定视图控制器的ViewDidAppear方法是否被调用,如果没有则展示拍照视图

var beenhereBefore = false

var imagePickerController :UIImagePickerController?

override func viewDidAppear(_ animated: Bool) {

if beenhereBefore {

//viewDidapear方法无论何时,在视图控制器展现时都会被调用,设置此值,控制器只展示一次

return

} else {

beenhereBefore = true

}

if isCameraAvailable() && doesCameraSupportTakingPhotos() {

imagePickerController = UIImagePickerController()

if let theController = imagePickerController{

theController.sourceType = .camera

theController.mediaTypes = [kUTTypeImage as NSString, kUTTypeVideo as NSString] as [String]

//                theController.mediaTypes = [kUTTypeVideo as NSString] as [String]

theController.allowsEditing = true

theController.delegate = self

present(theController, animated: true) {

}

}

} else {

print("Camera is not available")

}

}

override func viewDidLoad() {

super.viewDidLoad()

}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

let mediaType = info[.mediaType]

if let type:AnyObject = mediaType as AnyObject{

if type is String{

if let stringType :String = type as! String {

if stringType as NSString == kUTTypeVideo as NSString {

let urlOfVideo = info[.mediaURL] as! NSURL

if let url:NSURL = urlOfVideo{

print("rul \(url)")

}

}

if stringType as NSString == kUTTypeImage as NSString{

if let metadata = info[.mediaMetadata]{

let image = info[.originalImage] as! UIImage

if let theImage:UIImage = image{

print("image MetaData \(metadata)")

print("\(theImage)")

}

}

}

}

}

}

}

}

swift3 访问相册和摄像头

2017年05月10日 11:07:11 EIamor 阅读数：1245

版权声明：hahahaha , 努力 ing https://blog.csdn.net/EIamor/article/details/71515771

第一步：需要在项目中的Info.plist中添加相应的键

访问相册：Privacy - Photo Library Usage Description

访问摄像头：Privacy - Camera Usage Description

它们对应的值可以随意填写，但是其值是显示给用户的信息

第二步：请求访问

***注意：如果用button设置接收图片，则此button的类型不能为系统样式，即 addImageBtn.buttonType = .system 是无法设置成功的。 求大手告诉原因～～

这个例子中一整个图片添加是一个Button点击触发选择图片事件

首先要遵守UIImagePickerControllerDelegate，和UINavigationControllerDelegate

然后在button点击触发的事件中添加如下代码

@IBAction func chosePhoto(_ sender: UIButton) {

guard UIImagePickerController.isSourceTypeAvailable(.photoLibrary)else{    //如果是要访问相机只需要将.photoLibrary改为.camera即可

print("无法获得相册授权")

return

}

let picker = UIImagePickerController()

picker.allowsEditing = false   //不允许编辑图片

picker.sourceType = .photoLibrary //选择器访问的是相册(如果是访问相机则将.photoLibrary改为.camera)

picker.delegate = self   //设置代理

self.present(picker, animated: true, completion: nil)//以模态视图弹出选择器

}

guard 的作用是保证应用获得用户授权之后才能访问相册

第三步：访问完相册之后就要让在相册中被点击的图片设置为Button的图片

//必须要先设置picker的代理

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

//被点击的图片的信息保存在info字典中

self.albumBtn.setImage(info[UIImagePickerControllerOriginalImage] as? UIImage, for: .normal)

self.albumBtn.imageView?.contentMode = .scaleAspectFill

self.albumBtn.imageView?.clipsToBounds = true

dismiss(animated: true, completion: nil)

}

结果:

5.15更新****************************************

之前的版本里在打开相册的时候只能选择图片而不能选择视频，这是因为UIImagePickerViewController.mediaTypes为设置,当mediaTypes没设置的时候默认为kUTTypeImage ，即：只选择图片

所以当要选择视频的时候只需要将mediaTypes 设置为 kUTTypeMovie即可

例：

let picker = UIImagePickerController()

picker.delegate = self

picker.allowsEditing = true

picker.sourceType = .photoLibrary

picker.mediaTypes = [kUTTypeMovie as String , kUTTypeImage as String]   //可以选择视频和图片

present(picker, animated: true, completion: nil)

然后在 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])方法中判断选择的是图片还是视频之后在做需要做的操作

例：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

let type = info[UIImagePickerControllerMediaType] as? String          //获取所选中项目的类型

if type == kUTTypeMovie as String{                               //判断选中的是图片还是视频

let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL

self.dismiss(animated: true, completion: nil)

//写出你要做的操作，我这里的示例是做的共享的操作

let activityViewController = UIActivityViewController(activityItems: [videoURL], applicationActivities: nil)

activityViewController.popoverPresentationController?.sourceView = self.view

self.present(activityViewController, animated: true, completion: nil)

}else{

let image = info[UIImagePickerControllerOriginalImage] as! UIImage

self.selectedImage = image

self.dismiss(animated: true, completion: nil)

let shareVC = UIActivityViewController(activityItems: [image], applicationActivities: nil)

shareVC.popoverPresentationController?.sourceView = self.view

present(shareVC, animated: true, completion: nil)

}

}