[移动开发]Swift实现点击图片弹出相册

在Image View上添加点击手势Tap Gesture Recognizer

?给点击手势添加触发函数，拖拽点击手势至View Controller

函数名称Name：tapImageView ? ? ? ?Type:UITapGestureRecognizer

默认情况下UIImage View不会响应手势，修改Image View属性，勾选User Interaction Enabled，启用用户交互

?UIImagePickerController是ios系统提供的相册选图控制器

    @IBAction func tapImageView(_ sender: UITapGestureRecognizer) {
        //print(#function)
        let picker = UIImagePickerController()
        picker.delegate = self
        present(picker, animated: true, completion: nil)
    }

extension ViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate{
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        picker.dismiss(animated: true, completion: nil)
        imageView.image = info[.originalImage] as? UIImage
    }
}

当前控制器需要遵循的协议（可选的）：UIImagePickerControllerDelegate, UINavigationControllerDelegate

imagePickerController(){...}函数：选好图片会调用函数

picker.dismiss(animated: true, completion: nil)：选图页面消失