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Trying to make a UIButton that when long pressed, exposes four subviews (UIButtons - north, east, south & west) that user can then slide finger to and lift for 4 separate actions.
extension UIButton {
func EnablePopOuts (North:Bool = true, nTitle:String, nColor:UIColor = .black, nAction: Selector) {
if North {
let northButton = UIButton(frame: self.frame)
northButton.translatesAutoresizingMaskIntoConstraints = false
let nA = NSLayoutConstraint(item: northButton, attribute: .height
, relatedBy: .equal, toItem: self, attribute: .height, multiplier: 1, constant: 0)
let nB = NSLayoutConstraint(item: northButton, attribute: .width
, relatedBy: .equal, toItem: self, attribute: .width, multiplier: 1, constant: 0)
let nC = NSLayoutConstraint(item: northButton, attribute: .bottom
, relatedBy: .equal, toItem: self, attribute: . top, multiplier: 1, constant: 0)
let nD = NSLayoutConstraint(item: northButton, attribute: .leading
, relatedBy: .equal, toItem: self, attribute: .leading, multiplier: 1, constant: 0)
self.addSubview(northButton)
self.didAddSubview(northButton)
self.addConstraints([nA,nB,nC,nD])
self.bringSubviewToFront(northButton)
northButton.setTitle(nTitle, for: .normal)
northButton.backgroundColor = nColor
northButton.addTarget(Main.self, action: nAction, for: .touchUpInside)
self.layoutIfNeeded()
self.layoutSubviews()
}
}
}
EnablePopOuts runs but the northButton doesn't appear.
I'm trying to set 2 labels, one under other with different font size in the header. The function is called like this:
viewController.navigationItem.titleView = self.setHeader()
And code responsible for generating label is :
private func setHeader(agentName: String = "", isTyping: Bool = false) -> UIView {
let headerLabel: UILabel = {
let label = UILabel()
label.text = self.title
label.font = UIFont.systemFont(ofSize: 21)
label.textColor = UIColor.white
return label
}()
let subheaderLabel: UILabel = {
let label = UILabel()
label.font = UIFont.systemFont(ofSize: 10)
return label
}()
let headerView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(headerLabel)
view.addConstraints([
NSLayoutConstraint(item: headerLabel, attribute: .centerY, relatedBy: .equal, toItem: view, attribute: .centerY, multiplier: 1.0, constant: 0),
NSLayoutConstraint(item: headerLabel, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1.0, constant: 0),
NSLayoutConstraint(item: headerLabel, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 16),
NSLayoutConstraint(item: headerLabel, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 16)
])
return view
}()
if (!agentName.isEmpty) {
if (isTyping) {
subheaderLabel.text = agentName + " is typing ..."
} else {
subheaderLabel.text = agentName
}
headerView.addSubview(subheaderLabel)
}
return headerView
}
When I running IOS app there is nothing shown in the header. What is a reason?
I think you need to set the frame for the headerView. So in the initialization code for the headerView, use initializer with frame:
let headerView: UIView = {
// initialize the view with frame
let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 35))
// you want to call this on the headerLabel, not on view
headerLabel.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(headerLabel)
view.addConstraints([
NSLayoutConstraint(item: headerLabel, attribute: .centerY, relatedBy: .equal, toItem: view, attribute: .centerY, multiplier: 1.0, constant: 0),
NSLayoutConstraint(item: headerLabel, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1.0, constant: 0),
NSLayoutConstraint(item: headerLabel, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 16),
NSLayoutConstraint(item: headerLabel, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 16)
])
return view
}()
Moreover, I believe headerLabel you want to set translatesAutoresizingMaskIntoConstraints on headerLabel rather than on headerView (headerView is positioned through frame and not Autolayout).
Also, notice that you add subheaderLabel to the view, but you never position it, don't forget about it either (although this should cause only subheaderLabel not to be rendered properly).
New to xcode/swift, spending a couple of days now trying to fix this one. Creating a universal app and having problems getting the constraint working programmatically. I would like to programmatically add a label and a UITextField inside a TableView. The label should always have a fixed width. The text field should have variable width depending on the device.
Here is what is looks like now:
Here is an idea of how it should look:
The label should be a set width. But the textfield should use the available screen.
Here is the code so far:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Setup Cell
let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
// Make cell unselectable
cell.selectionStyle = .none
// Process Each Row
let row = indexPath.row
switch row
{
case 0:
let label = UILabel()
label.text = "First Name:"
label.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(40), height: CGFloat(30))
cell.contentView.addSubview(label)
var textField: UITextField = UITextField()
textField.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(170), height: CGFloat(30))
textField.borderStyle = .roundedRect
textField.backgroundColor = UIColor.magenta
textField.text = "TEST"
textField.textColor = UIColor.black
textField.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.addSubview(textField)
let leadingConstraint = NSLayoutConstraint(item: cell.contentView, attribute: .leftMargin, relatedBy: .equal, toItem: label, attribute: .leftMargin, multiplier: 1.0, constant: 0)
let trailingConstraint = NSLayoutConstraint(item: cell.contentView, attribute: .rightMargin, relatedBy: .equal, toItem: textField, attribute: .rightMargin, multiplier: 1.0, constant: 0)
cell.contentView.addConstraint(leadingConstraint)
cell.contentView.addConstraint(trailingConstraint)
....
Please let me know if you need additional information before a downvote. Any help would be appreciated. Thanks.
Answer by UpholderOfTruth:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Setup Cell
let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
// Make cell unselectable
cell.selectionStyle = .none
// Process Each Row
let row = indexPath.row
switch row
{
case 0:
let label = UILabel()
label.text = "First Name:"
label.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(40), height: CGFloat(30))
label.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.addSubview(label)
var textField: UITextField = UITextField()
textField.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(170), height: CGFloat(30))
textField.borderStyle = .roundedRect
textField.backgroundColor = UIColor.magenta
textField.text = "TEST"
textField.textColor = UIColor.black
textField.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.addSubview(textField)
// Horizontal Constraints
cell.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[label(==100)][textField]|", options: .init(rawValue: 0), metrics: nil, views: ["label": label, "textField": textField]))
// Vertical Constraints
cell.contentView.addConstraint(NSLayoutConstraint(item: label, attribute: .centerY, relatedBy: .equal, toItem: cell.contentView, attribute: .centerY, multiplier: 1, constant: 0))
cell.contentView.addConstraint(NSLayoutConstraint(item: textField, attribute: .centerY, relatedBy: .equal, toItem: cell.contentView, attribute: .centerY, multiplier: 1, constant: 0))
....
I would suggest go full auto layout and don't mix methods. So first set both view to use auto layout via setting the translatesAutoresizingMaskIntoConstraints to false.
Then either set the constraints visually like this:
cell.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[label(==100)][textField]|", options: .init(rawValue: 0), metrics: nil, views: ["label": label, "textField": textField]))
or with individual constraints like this:
cell.contentView.addConstraint(NSLayoutConstraint(item: label, attribute: .left, relatedBy: .equal, toItem: cell, attribute: .left, multiplier: 1, constant: 0))
cell.contentView.addConstraint(NSLayoutConstraint(item: label, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1, constant: 100))
cell.contentView.addConstraint(NSLayoutConstraint(item: label, attribute: .right, relatedBy: .equal, toItem: textField, attribute: .left, multiplier: 1, constant: 0))
cell.contentView.addConstraint(NSLayoutConstraint(item: textField, attribute: .right, relatedBy: .equal, toItem: cell, attribute: .right, multiplier: 1, constant: 0))
Of course this just handles horiztonal positioning and sizing you need to do something about vertical positioning and sizing as well but you may be setting that up further down in your code.
Edit:
To centre vertically you can do this:
cell.contentView.addConstraint(NSLayoutConstraint(item: label, attribute: .centerY, relatedBy: .equal, toItem: cell.contentView, attribute: .centerY, multiplier: 1, constant: 0))
cell.contentView.addConstraint(NSLayoutConstraint(item: textField, attribute: .centerY, relatedBy: .equal, toItem: cell.contentView, attribute: .centerY, multiplier: 1, constant: 0))
Edit2:
Combining into a single line:
cell.contentView.addConstraints([NSLayoutConstraint(item: label, attribute: .centerY, relatedBy: .equal, toItem: cell.contentView, attribute: .centerY, multiplier: 1, constant: 0), NSLayoutConstraint(item: textField, attribute: .centerY, relatedBy: .equal, toItem: cell.contentView, attribute: .centerY, multiplier: 1, constant: 0)])
Edit3:
cell.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-8-[label(==100)][textField]-8-|", options: .init(rawValue: 0), metrics: nil, views: ["label": label, "textField": textField]))
Change these properties:
switch row
{
case 0:
let leadingConstraint = NSLayoutConstraint(item: cell.contentView, attribute: .leftMargin, relatedBy: .equal, toItem: label, attribute: .leftMargin, multiplier: 1.0, constant: 0)
let trailingConstraint = NSLayoutConstraint(item: cell.contentView, attribute: .rightMargin, relatedBy: .equal, toItem: textField, attribute: .rightMargin, multiplier: 1.0, constant: 0)
cell.contentView.addConstraint(leadingConstraint)
cell.contentView.addConstraint(trailingConstraint)
let label = UILabel()
label.text = "First Name:"
//here is the trick: play with x and width. It might also be cell.contentView.size().width
label.frame = CGRect(x: CGFloat(35), y: CGFloat(0), width: CGFloat(cell.frame.width * 1/3), height: CGFloat(30))
cell.contentView.addSubview(label)
var textField = UITextField()
textField.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(cell.frame.width * 2/3), height: CGFloat(30))
textField.borderStyle = .roundedRect
textField.backgroundColor = UIColor.magenta
textField.text = "TEST TEST TEST"
textField.textColor = UIColor.black
textField.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.addSubview(textField)
Let me know if this works.
I have an app that uses a collectionview that scrolls horizontally, and has collectionviewcells inside of it. Everything was going fine until I tried to implement a login/register cell with 2 textfields in it using textfielddelegate. When I press on one of the textfields, the keyboard shows for a split second and then hides. After it does this, the view is pushed down a little bit and if I press the textfield again, it is pushed up and wont come down. Here are some screenshots of what it looks like:
before touching a textfield vs. after I touch a textfield
I get various UICollectionViewFlowLayout errors that call for me to make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes.
The behavior of the UICollectionViewFlowLayout is not defined because:
2017-04-26 13:55:03.199199-0400 Eyetube[1500:243622] the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.
2017-04-26 13:55:03.200490-0400 Eyetube[1500:243622] The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x10453ee90>, and it is attached to <UICollectionView: 0x104806800; frame = (0 0; 768 960); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x17405a610>; layer = <CALayer: 0x17002f0a0>; contentOffset: {2304, 0}; contentSize: {3072, 910}> collection view layout: <UICollectionViewFlowLayout: 0x10453ee90>.
2017-04-26 13:55:03.200575-0400 Eyetube[1500:243622] Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.
I tried debugging this multiple times, but it isn't too helpful in finding where exactly the error is coming from. I've been stuck on this issue for hours and can't seem to figure it out.
Where I initialize my layout in my collectionviewcontroller:
func setupCollectionView() {
if let flowLayout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout {
flowLayout.scrollDirection = .horizontal
flowLayout.minimumLineSpacing = 0
}
collectionView?.backgroundColor = UIColor.white
collectionView?.register(VideoFeedCell.self, forCellWithReuseIdentifier: cellId)
collectionView?.register(ChannelFeedCell.self, forCellWithReuseIdentifier: channelCellId)
collectionView?.register(ARFeedCell.self, forCellWithReuseIdentifier: augmentedRealityCellId)
collectionView?.register(LoginRegisterCell.self, forCellWithReuseIdentifier: loginRegisterCellId)
collectionView?.contentInset = UIEdgeInsetsMake(0, 0, 50, 0)
collectionView?.scrollIndicatorInsets = UIEdgeInsetsMake(0, 0, 50, 0)
collectionView?.isPagingEnabled = true
}
My sizeForItemAt func, also in my collectionviewcontroller (P.S., I am subtracting 50 from the height because of the bottom menubar I have added as a subview of the view. I also changed the collectionview's contentInset and scrollIndicatorInsets because of this):
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let cellSize = CGSize(width: view.frame.width, height: view.frame.height - 50)
return cellSize
}
Here is the complete code of the collectionviewcell, where I am having the issues:
import UIKit
class LoginRegisterCell: BaseCell, UITextFieldDelegate {
let logoImageView: UIImageView = {
let imageView = UIImageView()
imageView.image = UIImage(named: "eyetube_logo_font")
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.contentMode = .scaleAspectFit
return imageView
}()
let emailTextField: LeftPaddedTextField = {
let tf = LeftPaddedTextField()
tf.keyboardType = .emailAddress
tf.placeholder = "Enter email"
tf.substituteFontName = "SourceSansPro-Regular"
tf.layer.borderColor = UIColor.rgb(220, green: 220, blue: 220).cgColor
tf.layer.borderWidth = 1
tf.translatesAutoresizingMaskIntoConstraints = false
return tf
}()
let passwordTextField: LeftPaddedTextField = {
let tf = LeftPaddedTextField()
tf.placeholder = "Enter password"
tf.substituteFontName = "SourceSansPro-Regular"
tf.layer.borderColor = UIColor.rgb(220, green: 220, blue: 220).cgColor
tf.layer.borderWidth = 1
tf.isSecureTextEntry = true
tf.translatesAutoresizingMaskIntoConstraints = false
return tf
}()
lazy var loginButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor.rgb(225, green: 31, blue: 40)
button.titleLabel?.font = UIFont(name: "SourceSansPro-SemiBold", size: 20)
button.setTitle("Log In", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
button.addTarget(self, action: #selector(handleLogin), for: .touchUpInside)
return button
}()
lazy var registerLink: UIButton = {
let button = UIButton(type: .system)
button.setTitle("Don't have an account? Register here", for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
button.titleLabel?.font = UIFont(name: "SourceSansPro-Regular", size: 18)
button.setTitleColor(UIColor.darkGray, for: .normal)
let underlineAttribute = [NSUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue]
let underlineAttributedString = NSAttributedString(string: (button.titleLabel?.text)!, attributes: underlineAttribute)
button.titleLabel?.attributedText = underlineAttributedString
button.addTarget(self, action: #selector(handleRegister), for: .touchUpInside)
return button
}()
var containerView: UIView!
override func setupViews() {
super.setupViews()
self.emailTextField.delegate = self
emailTextField.returnKeyType = .next
self.passwordTextField.delegate = self
passwordTextField.returnKeyType = .done
containerView = UIView(frame: CGRect(x: 0, y: 0, width: self.frame.width, height: self.frame.height))
containerView.backgroundColor = .green
addSubview(containerView)
containerView.addSubview(logoImageView)
containerView.addSubview(emailTextField)
containerView.addSubview(passwordTextField)
containerView.addSubview(loginButton)
containerView.addSubview(registerLink)
setupLogoImageView()
setupInputs()
setupLoginButton()
setupRegisterLink()
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func handleLogin() {
//first check if the email/password textfields are empty or not
guard let email = emailTextField.text , !email.isEmpty else {
let alert = UIAlertView (title: "Invalid Email", message: "Please enter an email to log in", delegate: self, cancelButtonTitle: "OK")
alert.show()
return
}
guard let password = passwordTextField.text , !password.isEmpty else {
let alert = UIAlertView (title: "Invalid Password", message: "Please enter a password to log in", delegate: self, cancelButtonTitle: "OK")
alert.show()
return
}
//create session here
ApiLoginAuthentication.sharedInstance.login_now(username: email, password: password, onCompletion: {(loginSuccessful: Bool) -> Void in
guard (loginSuccessful) else {
DispatchQueue.main.async {
let alert = UIAlertView (title: "Invalid Account info", message: "The account information entered is invalid. Please log in with a valid account.", delegate: self, cancelButtonTitle: "OK")
alert.show()
}
return
}
DispatchQueue.main.async {
self.emailTextField.text = ""
self.passwordTextField.text = ""
}
print("the login was successful")
})
/**
let profileUrl: String = "https://eyetube.net/user/profile.asp"
ApiLoginAuthentication.sharedInstance.getContent(contentUrl: profileUrl, onCompletion: {(responseString: String, isLoggedIn: Bool) -> Void in
print(responseString)
print("user status: \(isLoggedIn)")
let json: Any?
do {
let data: NSData = responseString.data(using: String.Encoding.utf8)! as NSData
json = try JSONSerialization.jsonObject(with: data as Data, options: .allowFragments)
print(json)
} catch let error {
print("error: \(error)")
}
})**/
}
func handleRegister() {
let eyetubeRegisterLink = "https://eyetube.net/user/register.asp?rUrl="
UIApplication.shared.openURL(URL(string: eyetubeRegisterLink)!)
}
func setupLogoImageView() {
var sizeConstant: CGFloat!
var centerYConstant: CGFloat!
if UI_USER_INTERFACE_IDIOM() == .pad {
sizeConstant = 400
centerYConstant = -260
} else {
sizeConstant = 200
centerYConstant = -160
}
NSLayoutConstraint(item: logoImageView, attribute: .centerY, relatedBy: .equal, toItem: containerView, attribute: .centerY, multiplier: 1, constant: centerYConstant!).isActive = true
NSLayoutConstraint(item: logoImageView, attribute: .centerX, relatedBy: .equal, toItem: containerView, attribute: .centerX, multiplier: 1, constant: 0).isActive = true
NSLayoutConstraint(item: logoImageView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1, constant: sizeConstant).isActive = true
NSLayoutConstraint(item: logoImageView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1, constant: sizeConstant).isActive = true
}
func setupInputs() {
var widthConstant: CGFloat!
var leftConstant: CGFloat!
if UI_USER_INTERFACE_IDIOM() == .pad {
widthConstant = -64
leftConstant = 32
} else {
widthConstant = -32
leftConstant = 16
}
NSLayoutConstraint(item: emailTextField, attribute: .top, relatedBy: .equal, toItem: logoImageView, attribute: .bottom, multiplier: 1, constant: 0).isActive = true
NSLayoutConstraint(item: emailTextField, attribute: .left, relatedBy: .equal, toItem: containerView, attribute: .left, multiplier: 1, constant: leftConstant).isActive = true
NSLayoutConstraint(item: emailTextField, attribute: .width, relatedBy: .equal, toItem: containerView, attribute: .width, multiplier: 1, constant: widthConstant).isActive = true
NSLayoutConstraint(item: emailTextField, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1, constant: 50).isActive = true
NSLayoutConstraint(item: passwordTextField, attribute: .top, relatedBy: .equal, toItem: emailTextField, attribute: .bottom, multiplier: 1, constant: 8).isActive = true
NSLayoutConstraint(item: passwordTextField, attribute: .left, relatedBy: .equal, toItem: containerView, attribute: .left, multiplier: 1, constant: leftConstant).isActive = true
NSLayoutConstraint(item: passwordTextField, attribute: .width, relatedBy: .equal, toItem: containerView, attribute: .width, multiplier: 1, constant: widthConstant).isActive = true
NSLayoutConstraint(item: passwordTextField, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1, constant: 50).isActive = true
}
func setupLoginButton() {
NSLayoutConstraint(item: loginButton, attribute: .centerX, relatedBy: .equal, toItem: containerView, attribute: .centerX, multiplier: 1, constant: 0).isActive = true
NSLayoutConstraint(item: loginButton, attribute: .top, relatedBy: .equal, toItem: passwordTextField, attribute: .bottom, multiplier: 1, constant: 16).isActive = true
NSLayoutConstraint(item: loginButton, attribute: .width, relatedBy: .equal, toItem: passwordTextField, attribute: .width, multiplier: 1, constant: 0).isActive = true
NSLayoutConstraint(item: loginButton, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1, constant: 50).isActive = true
}
func setupRegisterLink() {
NSLayoutConstraint(item: registerLink, attribute: .centerX, relatedBy: .equal, toItem: containerView, attribute: .centerX, multiplier: 1, constant: 0).isActive = true
NSLayoutConstraint(item: registerLink, attribute: .top, relatedBy: .equal, toItem: loginButton, attribute: .bottom, multiplier: 1, constant: 12).isActive = true
NSLayoutConstraint(item: registerLink, attribute: .width, relatedBy: .equal, toItem: loginButton, attribute: .width, multiplier: 1, constant: 0).isActive = true
NSLayoutConstraint(item: registerLink, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1, constant: 40).isActive = true
}
}
I am trying to add the root view and subviews to a viewcontroller programmatically, but the view is not filling to screen as expected:
override func loadView() {
self.view = UIView(frame: CGRect(x: 0.0, y: 0.0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
self.view.backgroundColor = UIColor.blue
}
override func viewDidLoad() {
let alertView = Bundle.main.loadNibNamed("CHRApptTakenAlertView", owner: self, options: nil)![0] as! CHRApptTakenAlertView
self.view.translatesAutoresizingMaskIntoConstraints = false
alertView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(alertView)
self.view.addConstraint(NSLayoutConstraint(item: alertView, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.centerX, multiplier: 1, constant: 0))
self.view.addConstraint(NSLayoutConstraint(item: alertView, attribute: NSLayoutAttribute.centerY, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.centerY, multiplier: 1, constant: 0))
alertView.addConstraint(NSLayoutConstraint(item: alertView, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.width, multiplier: 1, constant: 350))
alertView.addConstraint(NSLayoutConstraint(item: alertView, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.height, multiplier: 1, constant: 250))
alertView.closeBtn.addTarget(self, action: #selector(self.closeBtnTouch), for: UIControlEvents.touchUpInside)
}
Remove the line self.view.translatesAutoresizingMaskIntoConstraints = false, and call self.view.layoutIfNeeded() after the adding the constraints.