如何通过UIKit实现类似Photos app的图片选择器

要实现类似Photos app的图片选择器，可以通过使用UIImagePickerController类以及UICollectionView来实现。下面是一个简单的示例代码：

1. 创建一个按钮，点击按钮后打开图片选择器：

import UIKit class ViewController: UIViewController, UIImagePickerControllerDelegate & UINavigationControllerDelegate { let imagePicker = UIImagePickerController() override func viewDidLoad() { super.viewDidLoad() let button = UIButton(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
        button.setTitle("Select Image", for: .normal)
        button.addTarget(self, action: #selector(selectImage), for: .touchUpInside)
        view.addSubview(button)
        
        imagePicker.delegate = self imagePicker.allowsEditing = false imagePicker.sourceType = .photoLibrary
    } @objc func selectImage() {
        present(imagePicker, animated: true, completion: nil)
    } func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) { if let image = info[.originalImage] as? UIImage { //处理选中的图片 }
        
        dismiss(animated: true, completion: nil)
    } func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        dismiss(animated: true, completion: nil)
    }
}

1. 创建一个UICollectionView来展示选择的图片：

class ImageCollectionViewController: UICollectionViewController { var selectedImages: [UIImage] = [] override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return selectedImages.count
    } override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ImageCell", for: indexPath) as! ImageCell cell.imageView.image = selectedImages[indexPath.row] return cell
    }
} class ImageCell: UICollectionViewCell { let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 100, height: 100)) override init(frame: CGRect) { super.init(frame: frame)
        
        imageView.contentMode = .scaleAspectFill
        imageView.clipsToBounds = true contentView.addSubview(imageView)
    }
}

通过以上代码，你可以实现一个简单的图片选择器，并用UICollectionView展示选中的图片。你可以根据需求进一步自定义UI和功能。

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