ios - 我如何向使用点击手势识别器的图像添加事件指示器

Question

我想知道如何将事件指示器添加到使用点击手势识别器的图像，如果用户点击图像需要很长时间才能加载，就像应用程序没有响应一样我无法在代码中知道如何添加它acton，当用户点击图片时

这是点击手势代码

     override func viewDidLoad() {
            super.viewDidLoad()

    profileImage.layer.cornerRadius = profileImage.frame.size.width/2
            profileImage.clipsToBounds = true
            profileImage.contentMode = .scaleAspectFill
            let tapGestur = UITapGestureRecognizer(target: self, action: #selector(SignupVC.selectProfileImage))
            profileImage.addGestureRecognizer(tapGestur)
            profileImage.isUserInteractionEnabled = true
    }

 @objc func selectProfileImage() {
        let pickerController = UIImagePickerController()
        pickerController.delegate = self
        PiActivityIndicator.startAnimating()
        present(pickerController, animated: true, completion: nil)
        pickerController.allowsEditing = true

    }

    extension SignupVC: UINavigationControllerDelegate,UIImagePickerControllerDelegate {


        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

            if let image = info["UIImagePickerControllerOriginalImage"] as? UIImage {
                selectedImage = image
                profileImage.image = image
                self.profileActivityIndicator.startAnimating()

            }


            dismiss(animated: true, completion: nil)
        }
    }

Answer 1

这里我使用了一个 imagePicker 和一个来自 storyBoard 的 Indicator而不是手势使用按钮 Action 问题是在图像选择器加载时间之前显示事件指示器

使用下面的代码作为引用

import UIKit

class ProfileViewController: UIViewController,UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    @IBOutlet weak var profileImageView: UIImageView!

    @IBOutlet weak var Spinner: UIActivityIndicatorView!

    override func viewDidLoad() {
        super.viewDidLoad()

        Spinner.isHidden = true
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func imageSelectAction(_ sender: Any) {
        //your tap gesture action like 
        //show and start animating spinner 
        //animate till output is not achieved 
        Spinner.isHidden = false
        self.Spinner.startAnimating()

        //Initiate a picker here 
        let picker = UIImagePickerController()
        //Delegates
        picker.delegate = self
        picker.allowsEditing = true
        //present to call imagePickerController delegate function
        present(picker, animated: true, completion: nil)
    }

    //delegate method
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        //selected image from picker
        var selectedImageFromPicker: UIImage?
        //additional checks if required 
        if let editedImage = info["UIImagePickerControllerEditedImage"] as? UIImage
        {
            selectedImageFromPicker = editedImage
        }
        else if let originalImage = info["UIImagePickerControllerOriginalImage"] as? UIImage
        {

            selectedImageFromPicker = originalImage
        }

        //here set value in your outlet profile image 
        if let selectedImage = selectedImageFromPicker
        {
            profileImageView.image = selectedImage
        }

        //Hide spinner and stop animating
        Spinner.isHidden = true
        self.Spinner.stopAnimating()
        dismiss(animated: true, completion: nil)

    }

    //if picker is cancelled in any case without selection
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        print("canceled picker")
        //if picker is cancelled so need to hide animating spinner
        Spinner.isHidden = true
        self.Spinner.stopAnimating()
        dismiss(animated: true, completion: nil)
    }
}

也可以轻松使用 TapGesture 我使用了一个按钮，只需在您的点击手势中添加我的按钮操作代码并在点击手势中启动微调器并在选择器委托(delegate)中隐藏动画微调器