SwiftUI中浏览图片选中（多选）

在SwiftUI可以实现浏览相册图片，但是只能选一张，无法多选，功能相对较少，这里可以使用一个库实现，当然是UIKit库，方法和自定义uikit控件差不多，库名字YPImagePicker，github就有
上代码

import SwiftUI
import YPImagePicker

struct YPImagePickerView: UIViewControllerRepresentable {
    typealias UIViewControllerType = YPImagePicker
    @Binding var pickeredImgs: [UIImage]
    //@Binding var pickeredVideos: [YPMediaVideo]
    var type: YPPickerScreen
    var startType: YPPickerScreen
    var limit: Int
    
    var warnMax: String {
        if YPPickerScreen.photo == self.type {
            return "最多只能选择 \(self.limit) 张照片"
        } else {
            return "最多只能选择 \(self.limit) 个视频"
        }
    }
    
    func makeUIViewController(context: Context) -> YPImagePicker {
        var config = YPImagePickerConfiguration()
        
        config.isScrollToChangeModesEnabled = true
        config.onlySquareImagesFromCamera = true
        config.usesFrontCamera = false
        config.showsPhotoFilters = true
        config.showsVideoTrimmer = true
        config.colors.filterBackgroundColor = .white
        config.colors.photoVideoScreenBackgroundColor = .white
        config.colors.bottomMenuItemBackgroundColor = .white
        config.colors.libraryScreenBackgroundColor = .white
        config.colors.multipleItemsSelectedCircleColor = UIColor(named: "#0bBB03")
        
        config.shouldSaveNewPicturesToAlbum = true
        config.albumName = "DefaultYPImagePickerAlbumName"
        config.startOnScreen = self.startType
        config.screens = [.library, self.type]
        config.showsCrop = .none
        config.targetImageSize = YPImageSize.original
        config.overlayView = UIView()
        
        config.hidesStatusBar = true
        config.hidesBottomBar = false
        config.preferredStatusBarStyle = UIStatusBarStyle.darkContent

        
        config.maxCameraZoomFactor = 1.0
        
      
        
        config.library.options = nil
        config.library.onlySquare = false
        config.library.isSquareByDefault = true
        config.library.minWidthForItem = nil
        config.library.mediaType = self.type == YPPickerScreen.photo ? YPlibraryMediaType.photo : YPlibraryMediaType.video
        config.library.defaultMultipleSelection = false
        config.library.maxNumberOfItems = self.limit
        config.library.minNumberOfItems = 1
        config.library.numberOfItemsInRow = 4
        config.library.spacingBetweenItems = 1.0
        config.library.skipSelectionsGallery = true
        config.library.preselectedItems = nil
        
        config.wordings.libraryTitle = "相册"
        config.wordings.cameraTitle = "拍照"
        config.wordings.next = "选好了"
        config.wordings.warningMaxItemsLimit = self.warnMax
        
//        config.video.compression = AVAssetExportPresetHighestQuality
        config.video.fileType = .mov
        config.video.recordingTimeLimit = 60.0
        config.video.libraryTimeLimit = 60.0
        config.video.minimumTimeLimit = 3.0
        config.video.trimmerMaxDuration = 60.0
        config.video.trimmerMinDuration = 3.0
        
        let picker = YPImagePicker(configuration: config)
        picker.didFinishPicking { [unowned picker] items, _ in
              for item in items {
                  switch item {
                  case .photo(let photo):
                      print(photo)
                      self.pickeredImgs.append(photo.modifiedImage ??  photo.originalImage)
                  case .video(let video):
                    print(video)
                    //self.pickeredVideos.append(video)
                  }
              }
            picker.dismiss(animated: true, completion: nil)
        }
//        present(picker, animated: true, completion: nil)
        return picker
    }
    
    func updateUIViewController(_ uiViewController: YPImagePicker, context: Context) {
        UIApplication.shared.endEditing()
    }
}

上面的设置具体什么意思可以去官网查看代码，这里我自定义了4个自定义参数，方便在多处使用，
分别是选中后的图片，是数组实现多张图片获取，然后就是打开后的类型，最后一个是最多可选，建议不超过9张。
下面实现调用

 .sheet(isPresented: $showImagePicker, content: {
                        
                        YPImagePickerView(pickeredImgs: self.$image, type: YPPickerScreen.photo, startType: YPPickerScreen.photo, limit: 6)
                        
                    })

这里建议使用sheet打开，不会sheet的就去看看之前的文章
这里传入的image是UIImage

 @State var image = [UIImage]()

如果获取后要显示出来还得把里面的值遍历出来，推荐使用一个库，当然你也能自己实现显示，使用foreach即可便利出来,库的名称是WaterfallGrid，如何使用可以自行去github上看看

WaterfallGrid(self.image, id: \.self) {
                        Image(uiImage: $0)
                            .resizable()
                            .scaledToFit()
                            .frame(width: 120, height: 120)
                        
                    }
                    .frame(width: self.width-20, height: 240, alignment: .leading)
                    .gridStyle(columns:3,spacing: 5,padding:  EdgeInsets(top: 0, leading: 3, bottom: 0, trailing: 3))
                    .background(Color.white)

其实这个库个人觉得不太喜欢，我怎么调都不符合我的预期，可能是我不会用吧，所以我自己实现了如何放置图片，这里就不展示了，记得哔哩哔哩上有人写了，我改良后还挺好用的。

查看图片前提是获取权限这点别忘了，然后就是这个库默认是有相机界面，可直接拍照，也可加滤镜什么的。