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苹果Swift 3.0轻松驾驭：手机相机与相册的实用攻略解析

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在苹果生态系统中，Swift 3.0作为其编程语言，为开发者带来了强大的功能。无论是开发一款相机应用，还是对手机相册进行高级操作，Swift 3.0都提供了丰富的工具和库。本文将为你解析如何在Swift 3.0中轻松驾驭手机相机与相册的实用攻略。

相机操作

首先，让我们来探索如何在Swift 3.0中访问和操作手机的相机。

1. 相机框架

Swift 3.0提供了AVFoundation框架，这是访问和操作相机的基础。以下是创建一个相机视图的步骤：

import UIKit
import AVFoundation

class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {
    var captureSession: AVCaptureSession!
    var previewLayer: AVCaptureVideoPreviewLayer!

    override func viewDidLoad() {
        super.viewDidLoad()

        captureSession = AVCaptureSession()
        guard let videoCaptureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) else { return }
        let videoInput: AVCaptureDeviceInput

        do {
            videoInput = try AVCaptureDeviceInput(device: videoCaptureDevice)
        } catch {
            return
        }

        if (captureSession.canAddInput(videoInput)) {
            captureSession.addInput(videoInput)
        } else {
            return
        }

        let metadataOutput = AVCaptureMetadataOutput()

        if (captureSession.canAddOutput(metadataOutput)) {
            captureSession.addOutput(metadataOutput)

            metadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
            metadataOutput.metadataObjectTypes = [.qr, .ean8, .ean13, .upce, .aztec, .pdf417, .code39, .code39Mod43, .code93, .code128, .interleaved2of5, .codablockF, .itf14, .qr, .aztec]
        } else {
            return
        }

        previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        previewLayer.frame = view.layer.bounds
        previewLayer.videoGravity = .resizeAspectFill
        view.layer.addSublayer(previewLayer)

        captureSession.startRunning()
    }
}

2. 拍照与录制视频

通过AVCaptureStillImageOutput和AVCaptureMovieFileOutput，你可以轻松地在应用中实现拍照和录制视频的功能。

import AVFoundation

let stillImageOutput = AVCaptureStillImageOutput()
if captureSession.canAddOutput(stillImageOutput) {
    captureSession.addOutput(stillImageOutput)
}

let movieFileOutput = AVCaptureMovieFileOutput()
if captureSession.canAddOutput(movieFileOutput) {
    captureSession.addOutput(movieFileOutput)
    let outputURL = getOutputURL()
    movieFileOutput.startRecording(toOutputFileURL: outputURL, recordingDelegate: self)
}

相册操作

接下来，我们来看看如何在Swift 3.0中操作相册。

1. 相册框架

Swift 3.0中，你可以使用Photos框架来访问和操作相册。

2. 显示相册

import UIKit
import Photos

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        PHPhotoLibrary.requestAuthorization { status in
            if status == .authorized {
                let fetchOptions = PHFetchOptions()
                fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]

                let allPhotos = PHAsset.fetchAssets(with: nil, options: fetchOptions)
                let assetsGrid = AssetsGridController(assets: allPhotos)
                self.present(assetsGrid, animated: true, completion: nil)
            }
        }
    }
}

3. 选择照片

import UIKit
import MobileCoreServices

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    var imagePicker = UIImagePickerController()

    override func viewDidLoad() {
        super.viewDidLoad()

        imagePicker.delegate = self
        imagePicker.sourceType = .photoLibrary
        imagePicker.mediaTypes = [kUTTypeImage as String]
        present(imagePicker, animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        picker.dismiss(animated: true, completion: nil)

        guard let originalImage = info[UIImagePickerControllerOriginalImage] as? UIImage else {
            return
        }

        // Handle the selected image
    }
}

通过以上步骤，你可以在Swift 3.0中轻松驾驭手机相机与相册。无论你是初学者还是经验丰富的开发者，这些实用攻略都将帮助你提升应用开发的水平。

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