我正在研究swift 3.0.1和xcode 8.2.1， 我想从图库中选择多个图像，并在集合视图中显示不同的拼贴画，当我从图库中选择图像并按下完成按钮集合视图时没有显示任何内容，但是当我按下手机屏幕时，屏幕上显示的图像。告诉我我的代码中有什么错误以及如何完成我的任务。我导入这些框架Photos，BSImagePicker，BSGridCollectionViewLayout。这是我的代码
@IBOutlet weak var collection: UICollectionView!
var imagePicker = UIImagePickerController()
var imageArray = [UIImage]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
imagePicker.delegate = self
collection.delegate = self
collection.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func Camera(_ sender: Any) {
if UIImagePickerController.isSourceTypeAvailable(.camera){
imagePicker.sourceType = .camera
imagePicker.allowsEditing = false
imagePicker.cameraCaptureMode = .photo
imagePicker.cameraFlashMode = .auto
imagePicker.modalPresentationStyle = .fullScreen
self.present(imagePicker, animated: true, completion: nil)
}
else{
let alert = UIAlertController(title: "No Camera", message: "Your Device has No Camera", preferredStyle: .alert)
let action = UIAlertAction(title: "OK", style: .destructive, handler: nil)
alert.addAction(action)
self.present(alert, animated: true, completion: nil)
}
}
@IBAction func Library(_ sender: Any) {
let vc = BSImagePickerViewController()
vc.maxNumberOfSelections = 4
//vc.takePhotoIcon = UIImage(named: "Tick")
vc.albumButton.tintColor = UIColor.blue
vc.cancelButton.tintColor = UIColor.blue
vc.doneButton.tintColor = UIColor.blue
vc.selectionCharacter = "✓"
vc.selectionFillColor = UIColor.green
vc.selectionStrokeColor = UIColor.clear
vc.selectionShadowColor = UIColor.black
vc.selectionTextAttributes[NSForegroundColorAttributeName] = UIColor.lightGray
vc.cellsPerRow = {( verticalSize: UIUserInterfaceSizeClass, horizontalSize: UIUserInterfaceSizeClass) -> Int in
switch (verticalSize, horizontalSize){
case(.compact , .regular):
return 3
case (.compact, .compact): // iPhone5-6 landscape
return 3
case (.regular, .regular): // iPad portrait/landscape
return 3
default:
return 3
}
}
bs_presentImagePickerController(vc, animated: true, select: { (asset: PHAsset) -> Void in
print("Selected: \(asset)")
let imageManager = PHImageManager.default()
let requestOptions = PHImageRequestOptions()
requestOptions.isSynchronous = true
requestOptions.deliveryMode = .highQualityFormat
imageManager.requestImage(for: asset, targetSize: CGSize(width: 132, height: 114) ,contentMode: .aspectFill, options: requestOptions, resultHandler:
{
image, error in
self.imageArray.append(image!)
})
self.collection.reloadData()
},
deselect: { (asset: PHAsset) -> Void in
print("Deselected: \(asset)")
},
cancel: { (asset: [PHAsset]) -> Void in
print("Cancel: \(asset)")
},
finish: { (asset: [PHAsset]) -> Void in
print("Finish: \(asset)")
}, completion: nil)
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imageArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let Cell : CellClass = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CellClass
Cell.imageView.image = self.imageArray[indexPath.row]
return Cell
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
imageArray.append(pickedImage)
}
else {
print("Image not Picked")
}
dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
self.imagePicker = UIImagePickerController()
dismiss(animated: true, completion: nil)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = collectionView.frame.width / 3 - 1
return CGSize(width: width, height: width)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 1.0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 1.0
}
func collectionView(_ collectionView: UICollectionView, didHighlightItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = UIColor.red
}
func collectionView(_ collectionView: UICollectionView, didUnhighlightItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = UIColor.green
}