我是XCode和Swift的新手。希望你们能帮助我。我遇到一个问题，当我单击相机按钮，拍摄照片并单击“使用照片”时，相机将被解除并再次返回主页面。
我真正想要的是： 当我单击“使用照片”时，主页面应该在集合视图中以缩略图大小显示刚刚拍摄的图像。 Camera Example The expected output
这是我的代码：
import UIKit
import CoreLocation
import Photos
import PhotosUI
import MessageUI
let albumName = "CP"
class SpeakerViewController: UIViewController,
CLLocationManagerDelegate, UIImagePickerControllerDelegate,
UINavigationControllerDelegate, UICollectionViewDataSource,
UICollectionViewDelegate, UICollectionViewDelegateFlowLayout,
MFMailComposeViewControllerDelegate {
@IBOutlet var lblLocation: UILabel!
@IBOutlet var tvNews: UITextView!
@IBOutlet var tapView: UIView!
@IBOutlet var btnAlbum: UIButton!
@IBOutlet var btnCamera: UIButton!
@IBOutlet var btnSend: UIButton!
let locationManager = CLLocationManager()
let geoCoder = CLGeocoder()
var latitude = [String]()
var longitude = [String]()
var tap : UITapGestureRecognizer! = UITapGestureRecognizer()
var assetCollection: PHAssetCollection! = PHAssetCollection()
var photoAsset : PHFetchResult<PHAsset>!
var albumFound : Bool = false
var sendLocation : String = ""
var sendContent : String = ""
var imageArray = [UIImage]()
var isCamera : Bool = false
@IBAction func btnBack(_ sender: AnyObject) {
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.deleteAssets(self.photoAsset)
}, completionHandler: {(success, error) in
NSLog("Delete image => %@", (success ? "Success" : "Error"))
self.navigationController?.dismiss(animated: true, completion: nil)
})
}
override func viewDidLoad() {
super.viewDidLoad()
LocalStore.setActiveView("speaker")
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.navigationBar.barTintColor = UIColor(red: 255/255, green: 237/255, blue: 0/255, alpha: 1.0)
if(locationManager.responds(to: #selector(CLLocationManager.requestAlwaysAuthorization))) {
locationManager.requestAlwaysAuthorization()
}
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
tap = UITapGestureRecognizer(target: self, action: #selector(SpeakerViewController.DismissKeyboard))
let fetchOptions = PHFetchOptions()
fetchOptions.predicate = NSPredicate(format: "title = %@", albumName)
let collection:PHFetchResult = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: fetchOptions)
if let first_Obj:AnyObject = collection.firstObject{
//found the album
self.albumFound = true
self.assetCollection = first_Obj as! PHAssetCollection
} else {
var albumPlaceholder:PHObjectPlaceholder!
NSLog("\nFolder \"%@\" does not exist\nCreating now...", albumName)
PHPhotoLibrary.shared().performChanges({
let request = PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle: albumName)
albumPlaceholder = request.placeholderForCreatedAssetCollection
},
completionHandler: {success, error in
if(success){
print("Successfully created folder")
self.albumFound = true
let collection = PHAssetCollection.fetchAssetCollections(withLocalIdentifiers: [albumPlaceholder.localIdentifier], options: nil)
self.assetCollection = collection.firstObject as PHAssetCollection!
} else {
print("Error creating folder")
self.albumFound = false
}
})
}
NotificationCenter.default.addObserver(self,
selector: #selector(SpeakerViewController.keyboardShow(_:)),
name: NSNotification.Name.UIKeyboardDidShow,
object: nil)
NotificationCenter.default.addObserver(self,
selector: #selector(SpeakerViewController.keyboardHide(_:)),
name: NSNotification.Name.UIKeyboardDidHide,
object: nil)
NotificationCenter.default.addObserver(self,
selector: #selector(SpeakerViewController.applicationBecameActive(_:)),
name: NSNotification.Name.UIApplicationDidBecomeActive,
object: nil)
NotificationCenter.default.addObserver(self,
selector: #selector(SpeakerViewController.applicationBecameInactive(_:)),
name: NSNotification.Name.UIApplicationWillResignActive,
object: nil)
}
/* Start listening for iCloud user change notifications */
func applicationBecameActive(_ notification: Notification){
print("did become active notification")
if LocalStore.getPostIdMenu() != "0" {
self.navigationController?.dismiss(animated: true, completion: nil)
LocalStore.setPostIdMenu("0")
}
}
func applicationBecameInactive(_ notification: Notification){
print("did become inactive notification")
LocalStore.setPostIdMenu("0")
}
func keyboardShow(_ notification: Notification) {
print("Keyboard Show")
self.view.addGestureRecognizer(tap)
}
func keyboardHide(_ notification: Notification){
print("Keyboard Hide")
self.view.removeGestureRecognizer(tap)
}
override func viewWillAppear(_ animated: Bool) {
//fetch the photo from the collection
self.navigationController?.hidesBarsOnTap = false
self.photoAsset = PHAsset.fetchAssets(in: self.assetCollection, options: nil)
self.collectionView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
let alertView = UIAlertController(title: "出现错误", message: "无法检索您的位置", preferredStyle: .alert)
alertView.addAction(UIAlertAction(title: "好的", style: .default){ _ in})
self.present(alertView, animated: true, completion: nil)
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
latitude.removeAll()
longitude.removeAll()
let currentLocation = locations.last!
print("didUpdateToLocation: \(currentLocation)")
latitude.append(String(format: "%.8f", currentLocation.coordinate.latitude))
longitude.append(String(format: "%.8f", currentLocation.coordinate.longitude))
print("Latitude \(latitude.count), Longtitude \(longitude.count)")
geoCoder.reverseGeocodeLocation(currentLocation, completionHandler: {(placemarks, error) -> Void in
if(error == nil && placemarks!.count > 0 ) {
let placeMark = placemarks![0] as CLPlacemark
if (placeMark.addressDictionary?["Thoroughfare"] as? String) != nil {
self.lblLocation.text = "\(placeMark.thoroughfare!), \(placeMark.postalCode!), \(placeMark.administrativeArea!)"
print("Location \(placeMark.locality!)\(placeMark.country!)")
self.locationManager.stopUpdatingLocation()
self.sendLocation = self.lblLocation.text!
} else {
print("thoroughfare not found, reupdate coordinate")
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.startUpdatingLocation()
}
} else {
NSLog("%@", error.debugDescription)
}
})
}
func DismissKeyboard() {
view.endEditing(true)
}
@IBOutlet var collectionView: UICollectionView!
@IBAction func btnAlbum(_ sender: AnyObject) {
isCamera = false
if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.savedPhotosAlbum)) {
let imagePicker : UIImagePickerController = UIImagePickerController()
imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
imagePicker.mediaTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary)!
imagePicker.delegate = self
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
}
}
@IBAction func btnCamera(_ sender: AnyObject) {
isCamera = true
if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera)) {
let imagePicker : UIImagePickerController = UIImagePickerController()
imagePicker.sourceType = UIImagePickerControllerSourceType.camera
imagePicker.delegate = self
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
} else {
let alert = UIAlertController(title: "出现错误", message: "您的手机没有相机", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "好的", style: .default, handler: {(alertAction) in
alert.dismiss(animated: true, completion: nil)
}))
self.present(alert, animated: true, completion: nil)
}
}
@IBAction func btnSend(_ sender: AnyObject) {
var count : Int = 0
if(self.photoAsset != nil) {
count = self.photoAsset.count
}
if (tvNews.text != "" && count > 0) {
sendContent = tvNews.text
if (MFMailComposeViewController.canSendMail()) {
let emailTitle = "App"
let messageBody = "位置: \(sendLocation) \n\n \(sendContent) \n\n "
let toReceipients = ["test@com"]
let mc : MFMailComposeViewController = MFMailComposeViewController()
mc.mailComposeDelegate = self
mc.setSubject(emailTitle)
mc.setMessageBody(messageBody, isHTML: false)
mc.setToRecipients(toReceipients)
}
for image in self.imageArray {
let photoData : Data = UIImagePNGRepresentation(image)!
mc.addAttachmentData(photoData, mimeType: "image/png", fileName: "CP.png")
}
self.present(mc, animated: true, completion: nil)
} else {
print("No email account found")
}
} else {
let alertView = UIAlertController(title: "出现错误", message: "没有内容或照片", preferredStyle: .alert)
alertView.addAction(UIAlertAction(title: "好的", style: .default, handler: {(alertAction) in
alertView.dismiss(animated: true, completion: nil)
}))
self.present(alertView, animated: true, completion: nil)
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
var count : Int = 0
if(self.photoAsset != nil) {
count = self.photoAsset.count
}
return count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell: PhotoCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "PhotoCell", for: indexPath) as! PhotoCollectionViewCell
let asset : PHAsset = self.photoAsset[(indexPath as NSIndexPath).item] as PHAsset
PHImageManager.default().requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFill, options: nil, resultHandler: {(result, info) in
if let image = result {
cell.setThumbnailImage(image)
self.imageArray.append(image)
}
})
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "viewLargePhoto") {
if let controller:ViewPhotoViewController = segue.destination as? ViewPhotoViewController {
if let cell = sender as? UICollectionViewCell {
if let indexPath: IndexPath = self.collectionView.indexPath(for: cell) {
controller.index = (indexPath as NSIndexPath).item
controller.photoAsset = self.photoAsset
controller.assetCollection = self.assetCollection
}
}
}
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 4
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 1
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if(isCamera) {
let image = info["UIImagePickerControllerOriginalImage"] as! UIImage
PHPhotoLibrary.shared().performChanges({
let createAssetRequest = PHAssetChangeRequest.creationRequestForAsset(from: image)
let assetPlaceholder = createAssetRequest.placeholderForCreatedAsset
if let albumChangeRequest = PHAssetCollectionChangeRequest(for: self.assetCollection,
assets: self.photoAsset as PHFetchResult<PHAsset>) {
let enumeration: NSArray = [assetPlaceholder!]
albumChangeRequest.addAssets(enumeration)
}
//CORRECTION Error : App crashes
}, completionHandler: {(success, error) in
NSLog("Adding Image to Library => %@",(success ? "Success" : "Error!"))
//Relocated1
})
//CORRECTION Relocated1
picker.dismiss(animated: true, completion: nil)
} else {
let image = info["UIImagePickerControllerOriginalImage"] as! UIImage
PHPhotoLibrary.shared().performChanges({
let createAssetRequest = PHAssetChangeRequest.creationRequestForAsset(from: image)
let assetPlaceholder = createAssetRequest.placeholderForCreatedAsset
if let albumChangeRequest = PHAssetCollectionChangeRequest(for: self.assetCollection,
assets: self.photoAsset as PHFetchResult<PHAsset>) {
let enumeration: NSArray = [assetPlaceholder!]
albumChangeRequest.addAssets(enumeration)
}
}, completionHandler: {(success, error) in
NSLog("Adding Image to Library => %@",(success ? "Success" : "Error!"))
picker.dismiss(animated: true, completion: nil)
//self.navigationController?.dismiss(animated: true, completion: nil)
})
}
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true, completion: nil)
}
func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
switch result {
case .cancelled:
let alertView = UIAlertController(title: "取消电邮", message: "您已经取消电邮", preferredStyle: .alert)
alertView.addAction(UIAlertAction(title: "好的", style: .default, handler: {(alertAction) in
alertView.dismiss(animated: true, completion: nil)
}))
self.present(alertView, animated: true, completion: nil)
case .saved:
let alertView = UIAlertController(title: "保存电邮", message: "您已经保存电邮", preferredStyle: .alert)
alertView.addAction(UIAlertAction(title: "好的", style: .default, handler: {(alertAction) in
alertView.dismiss(animated: true, completion: nil)
}))
self.present(alertView, animated: true, completion: nil)
case .sent:
let alertView = UIAlertController(title: "发送电邮", message: "您已经发送您的电邮", preferredStyle: .alert)
alertView.addAction(UIAlertAction(title: "好的", style: .default, handler: {(alertAction) in
alertView.dismiss(animated: true, completion: nil)
}))
self.present(alertView, animated: true, completion: nil)
case .failed:
let alertView = UIAlertController(title: "发送失败", message: "请检查您的电邮设定", preferredStyle: .alert)
alertView.addAction(UIAlertAction(title: "好的", style: .default, handler: {(alertAction) in
alertView.dismiss(animated: true, completion: nil)
}))
self.present(alertView, animated: true, completion: nil)
//CORRECTION default:
// break
default :
break
}
self.dismiss(animated: false, completion: nil)
}
}
提前致谢！