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。
