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linesConvergingAnimation = UIViewPropertyAnimator(duration: 0.2, curve: UIViewAnimationCurve.linear, animations: {
    // Set the new constraints
    self.firstLine.snp.remakeConstraints({ (make) in
        make.height.equalTo(self.lineHeight) // constant
        make.width.equalTo(self.containerView.snp.width)
        make.centerX.equalTo(self.containerView.snp.centerX)
        make.centerY.equalTo(self.containerView.snp.centerY)
    })
    self.thirdLine.snp.remakeConstraints({ (make) in
        make.height.equalTo(self.lineHeight) // constant

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linesConvergingAnimation.isReversed = true
// Finish animation in reverse
linesConvergingAnimation.startAnimation()

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// Add a completion block to the UIViewPropertyAnimator 
linesConvergingAnimation.addCompletion({ (position) in
    // since this is the reversed animation's completion block, the
    // "final position" is the initial animation's target-start-position.
    if position == .start {
        self.linesAreX = false
        // reset constraints back to normal  
        self.firstLine.snp.remakeConstraints({ (make) in
            make.height.equalTo(self.lineHeight)
            make.width.equalTo(self.containerView.snp.width)

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// show a nav bar
// 1. change some constraints
navBarHeightConstraint.update(offset: 80)
// 2. animate 
UIView.animate(withDuration: 0.10, delay: 0.0, options: .curveLinear, animations: {
  self.view.layoutIfNeeded() // Apple docs: "layout the subviews immediately"
}, completion: nil)

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// 1. change some constraints
navBarHeightConstraint.update(offset: 80)
// 2. animate 
UIView.animate(withDuration: 0.10, delay: 0.0, options: .curveLinear, animations: {
  self.navBar.layoutIfNeeded()
}, completion: nil)

saoudrizwan

class LinkResponsiveTextView: UITextView {
    
    override init(frame: CGRect, textContainer: NSTextContainer?) {
        super.init(frame: frame, textContainer: textContainer)
        
        self.delaysContentTouches = false
        // required for tap to pass through on to superview & for links to work
        self.isScrollEnabled = false
        self.isEditable = false
        self.isUserInteractionEnabled = true

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import SafariServices

var safariViewController: SFSafariViewController?

extension ViewController: SFSafariViewControllerDelegate {
    
    func safariViewController(_ controller: SFSafariViewController, didCompleteInitialLoad didLoadSuccessfully: Bool) {
        if !didLoadSuccessfully {
            // check if online
            print("couldn't open safari view")

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let longPress = UILongPressGestureRecognizer(target: self, action: #selector(upgradeAlertViewOtherUpgradesLongPressHandler))
longPress.minimumPressDuration = 0

var longPressGRStartPoint: CGPoint?
var didCancelLongPressGR = false
    
func viewTouched(sender: UILongPressGestureRecognizer) {
    let currentPoint = sender.location(in: self.view)
    switch sender.state {
    case .began:

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let numbers = [1, 2, 3, 4, 5]
var evenNumbers = [Int]()

for i in 0..<numbers.count {
    let number = numbers[i]
    if number % 2 == 0 {
        evenNumbers.append(number)
    }
}

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let evenNumbers = [1, 2, 3, 4, 5].filter { (number) -> Bool in
    if number % 2 == 0 {
        return true
    } else {
        return false
    }
}