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extension XCUIElement {
    func clearText(andReplaceWith newText:String? = nil) {
        tap()
        press(forDuration: 1.0)
        var select = XCUIApplication().menuItems["Select All"]

        if !select.exists {
            select = XCUIApplication().menuItems["Select"]
        }
        //For empty fields there will be no "Select All", so we need to check

hsleedevelop

//My solution is to cancel the navigation and load the request with loadRequest: again. This will be come the similar //behavior like UIWebView which always open new window in the current frame.
//
//Implement the WKUIDelegate delegate and set it to _webview.uiDelegate. Then implement:
//https://stackoverflow.com/a/25853806/3374327

- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures
{
  if (!navigationAction.targetFrame.isMainFrame) {
    [webView loadRequest:navigationAction.request];
  }

hsleedevelop

class UserInfoValidator {
    enum Validation {
        case nickname
        
        var pattern: String {
            switch self {
            case .nickname:
                return "^[a-zA-Z0-9ㄱ-ㅣ가-힣\\-\\.\\_]{1,16}$"
            default:
                return ""

hsleedevelop

extension UILabel {
    
    @objc
    func set(underLineFor keyword: String) {
        guard let text = self.text ?? self.attributedText?.string else { return }

        let attributedString = self.attributedText.map(NSMutableAttributedString.init(attributedString:)) ?? NSMutableAttributedString(string: text)
        let indices = attributedString.string.indicesOf(string: keyword)
        let length = keyword.count

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extension UIViewController {

    func isVisible() -> Bool {
        if #available(iOS 9.0, *) {
            if let view = self.viewIfLoaded {
                return view.window != nil
            }
            
            return false
        } else {

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extension UIViewController {
    func embed(_ vc: UIViewController, in _containerView: UIView? = nil) {
        let containerView: UIView = _containerView ?? view // Use the whole view if no container view is provided.
        containerView.addSubview(vc.view)
        NSLayoutConstraint.activate([
            vc.view.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 0),
            vc.view.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: 0),
            vc.view.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 0),
            vc.view.bottomAnchor.constraint(equalTo: containerView.bottomAnchor, constant: 0)
        ])

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extension UIView {
    func superview<T>(of type: T.Type) -> T? {
        return superview as? T ?? superview.flatMap { $0.superview(of: type) }
    }
}

// Example usage:
func textFieldDidBeginEditing(_ textField: UITextField) {
    // Get the cell containing the textfield.
    if let cell = textField.superview(of: TextFieldTableViewCell.self) {

hsleedevelop

If you work on a Swift project that follows the Model-View-ViewModel (MVVM) architecture or similar, you may want to jump to counterpart in Xcode from your view to your model, and then to your view model. (ie. by using Ctrl+Cmd+Up and Ctrl+Cmd+Down).

You can do this in recent versions of Xcode by setting a configuration default.

From a terminal, just type this command and press Enter:

defaults write com.apple.dt.Xcode IDEAdditionalCounterpartSuffixes -array-add "ViewModel" "View"

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typealias CustomLabelTouchHandler = (CustomLabel) -> Void
typealias CustomLabelTouchIndexHandler = (CustomLabel, Int) -> Void

private var touchHandler: CustomLabelTouchHandler?
private var touchHandlerWithIndex: CustomLabelTouchIndexHandler?

///Never ever use ide attribute text, then will trigger correctly
    @objc func didLabelTouchedWidthIndexHandler(_ gestureRecognizer: UIGestureRecognizer) {
        guard let attributedString = self.attributedText, let font = self.font else { return }
        

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// The trick is to link the DeviceSupport folder from the beta to the stable version.
// sudo needed if you run the Mac App Store version. Always download the dmg instead... you'll thank me later :)

// Support iOS 13.2 devices (Xcode 11.2) with Xcode 11.1:
sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/13.2 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

// Xcode 10.3 to Xcode 11
sudo ln -s /Applications/Xcode-11.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/13.0 /Applications/Xcode-10.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

// Then restart Xcode and reconnect your devices. You will need to do that for every beta of future iOS versions