Swift

（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

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, 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.

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

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)

}