ios – Swift 3：在不使用UIImagePickerController的情况下从照

这是Swift 3代码的版本.

导入照片框架

import Photos

//Array of PHAsset type for storing photos
var images = [PHAsset]()

使用此功能可以在viewDidLoad中的某个位置或在您想要获取照片的任何位置获取照片.

func getImages() {
    let assets = PHAsset.fetchAssets(with: PHAssetMediaType.image,options: nil)
    assets.enumerateObjects({ (object,count,stop) in
       // self.cameraAssets.add(object)
        self.images.append(object)
    })

    //In order to get latest image first,we just reverse the array
    self.images.reverse() 

    // To show photos,I have taken a UICollectionView       
    self.photosCollectionView.reloadData()
}

其余是UICollectionView数据源和代理.请参阅如何显示图像的cellForItem数据源方法.

func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
       return images.count
    }

func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PhotoCollectionViewCell",for: indexPath) as! PhotoCollectionViewCell
    let asset = images[indexPath.row]
    let manager = PHImageManager.default()
    if cell.tag != 0 {
            manager.cancelImageRequest(PHImageRequestID(cell.tag))
        }
    cell.tag = Int(manager.requestImage(for: asset,targetSize: CGSize(width: 120.0,height: 120.0),contentMode: .aspectFill,options: nil) { (result,_) in
                                                cell.photoImageView?.image = result
        })
    return cell
}

根据您的需要调整以下代表.

func collectionView(_ collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeForItemAt indexPath: IndexPath) -> CGSize {
    let width = self.view.frame.width * 0.32
    let height = self.view.frame.height * 0.179910045
    return CGSize(width: width,height: height)
}

func collectionView(_ collectionView: UICollectionView,minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 2.5
}

func collectionView(_ collectionView: UICollectionView,insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsets(top: 5,left: 5,bottom: 5,right: 5)
}

func collectionView(_ collectionView: UICollectionView,minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return 0
}

务必保持照片权限.如果单击“不允许”,则必须使用PHPhotoLibrary.authorizationStatus()管理授权.

您可以阅读有关Photos框架的更多信息.