Swift调用相机和系统相册

首先需要在Info.plist文件中添加两个键值对

然后利用系统类UIImagePickerController调用相机相册，下面已经封装好了类，继承该类调用showImagePickerController（）方法就会自动调用相机相册
github地址https://github.com/ColdChains/LAXImagePickerController

import UIKitclass LAXImagePickerController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {var imagePickerController = UIImagePickerController()var didFinishPickingBlock: ((_ image: UIImage?) -> Void)?var imageSize = CGSize.init(width: 100, height: 100)var imageName = "image.png"override func viewDidLoad() {super.viewDidLoad()imagePickerController.modalTransitionStyle = .flipHorizontalimagePickerController.allowsEditing = true}func showCamera() {//UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front)if UIImagePickerController.isSourceTypeAvailable(.camera) {imagePickerController.sourceType = .cameraself.show(imagePickerController, sender: nil)} else {let alert = UIAlertController.init(title: "提示", message: "没有检测到摄像头", preferredStyle: .alert)let cancel = UIAlertAction.init(title: "确定", style: .cancel, handler: nil)alert.addAction(cancel)self.show(alert, sender: nil)}}private func showPhotoLibrary() {if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {imagePickerController.sourceType = .photoLibraryimagePickerController.delegate = selfself.show(imagePickerController, sender: nil)} else {let alert = UIAlertController.init(title: "提示", message: "不能打开相册", preferredStyle: .alert)let cancel = UIAlertAction.init(title: "确定", style: .cancel, handler: nil)alert.addAction(cancel)self.show(alert, sender: nil)}}func showImagePickerController() {let sheet = UIAlertController.init(title: "请选择", message: nil, preferredStyle: .actionSheet)let cancel = UIAlertAction.init(title: "取消", style: .cancel, handler: nil)let camera = UIAlertAction.init(title: "拍照", style: .default) {(alert) inself.showCamera()}let photo = UIAlertAction.init(title: "相册", style: .default) {(alert) inself.showPhotoLibrary()}sheet.addAction(camera)sheet.addAction(photo)sheet.addAction(cancel)self.show(sheet, sender: nil)}//保存图片至沙盒private func saveImage(currentImage: UIImage, persent: CGFloat, imageName: String){if let imageData = UIImageJPEGRepresentation(currentImage, persent) as NSData? {let fullPath = NSHomeDirectory().appending("/Documents/").appending(imageName)imageData.write(toFile: fullPath, atomically: true)print("fullPath=\(fullPath)")}}private func saveImage(currentImage: UIImage, newSize: CGSize, imageName: String){//压缩图片尺寸UIGraphicsBeginImageContext(newSize)currentImage.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))if let newImage = UIGraphicsGetImageFromCurrentImageContext() {//UIImageJPEGRepresentation此方法可将图片压缩，但是图片质量基本不变，第二个参数即图片质量参数。if let imageData = UIImageJPEGRepresentation(newImage, 1) as NSData? {let fullPath = NSHomeDirectory().appending("/Documents/").appending(imageName)imageData.write(toFile: fullPath, atomically: true)print("fullPath=\(fullPath)")}}}//MARK:- UIImagePickerControllerDelegatefunc imagePickerController(_ picker:UIImagePickerController, didFinishPickingMediaWithInfo info: [String :Any]){var image: UIImage?if(picker.allowsEditing){//裁剪后图片image = info[UIImagePickerControllerEditedImage] as? UIImage}else{//原始图片image = info[UIImagePickerControllerOriginalImage] as? UIImage}if image != nil {saveImage(currentImage: image!, newSize: imageSize, imageName: imageName)let fullPath = NSHomeDirectory().appending("/Documents/").appending(imageName)let savedImage: UIImage = UIImage(contentsOfFile: fullPath)!didFinishPickingBlock?(savedImage)//在这里调用网络通讯方法，上传头像至服务器...}picker.dismiss(animated: true, completion: nil)}func imagePickerControllerDidCancel(_ picker:UIImagePickerController){picker.dismiss(animated:true, completion:nil)}}

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