lengocgiang

# addSubview
UIView.transition(with: self.view, duration: 0.25, options: [.transitionCrossDissolve], animations: {
  self.view.addSubview(view)
}, completion: nil)

# removeFromSuperview
UIView.transition(with: self.view, duration: 0.25, options: [.transitionCrossDissolve], animations: {
  subview.removeFromSuperview()
}, completion: nil)

saoudrizwan

import UIKit

extension UIView {
    
    // In order to create computed properties for extensions, we need a key to 
    // store and access the stored property
    fileprivate struct AssociatedObjectKeys {
        static var tapGestureRecognizer = "MediaViewerAssociatedObjectKey_mediaViewer"
    }
    

Blackjacx

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
  
    let strippedString = <change replacements string so it fits your requirement - strip, trim, etc>

    // replace current content with stripped content
    if let replaceStart = textField.position(from: textField.beginningOfDocument, offset: range.location),
        let replaceEnd = textField.position(from: replaceStart, offset: range.length),
        let textRange = textField.textRange(from: replaceStart, to: replaceEnd) {

        textField.replace(textRange, withText: strippedString)

ferbass

import UIKit

extension UIButton {


    private func actionHandleBlock(action:(() -> Void)? = nil) {
        struct __ {
            static var action :(() -> Void)?
        }
        if action != nil {