scrollView.contentOffset does work properly inside button func but the same code is non responsive in the viewDidLoad func
#IBOutlet weak var scrollView: UIScrollView!
#IBAction func scrollBtn(_ sender: UIButton) {
scrollView.contentOffset.x = 200
}
override func viewDidLoad() {
super.viewDidLoad()
scrollView.contentOffset.x = 200
}
i am trying to change the initial position of the scroll view
Try using it in viewWillAppear or viewDidAppear. May be the reason behind it is not working in viewDidLoad is that the view has not get rendered at the time the viewDidLoad invoked.
Related
I have a view container in my view controller, which is stretched to whole screen. User interaction enabled is on. When I open another view via this view container in this view controller, button is clickable but doesn't respond. What should I do to make it work?
ViewController:
class ViewController: UIViewController {
#IBOutlet weak var viewContainer: UIView!
var views: [UIView]!
override func viewDidLoad() {
super.viewDidLoad()
views = [UIView]()
views.append(LoginVC().view)
views.append(RegisterVC().view)
for v in views{
viewContainer.addSubview(v)
}
viewContainer.bringSubview(toFront: views[1])
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func switchViewAction(_ sender: UISegmentedControl) {
print("clicked - segment")
self.viewContainer.bringSubview(toFront: views[sender.selectedSegmentIndex])
}
and this is the button in the another view
#IBAction func registerTapped(_ sender: UIButton) {
print("Clicked - register")
}
I used Managing View Controllers tutorial to make it working.
You have to replace the entire ViewController, not just the View.
#IBAction func switchViewAction(_ sender: UISegmentedControl) {
self.viewContainer.bringSubview(toFront: views[sender.selectedSegmentIndex])
}
Your current code is just replacing LoginVC's view with RegisterVC's view, instead of replacing LoginVC with RegisterVC. When you do that, you leave behind the ViewController in charge of actually responding to any interaction.
You'll have to rework your code to keep track of the ViewControllers instead of just their views. Then, instead of adding all of your views to viewContainer and moving them to the front when you need to change the current view, you should set the your child ViewController (the ViewController embedded in your container) to the ViewController you want to show (either LoginVC or RegisterVC).
I'm working on a Swift app and running into a crazy odd problem. I have a simple storyboard view controller setup, it has 3 UIButtons a UIImageView and a UIView (as a subview of the main view).
I want to programmatically add a WKWebView to the UIView.
Easy enough right? All of the above are in the Storyboard View, declared in the custom UIViewController class and connected in IB. However at run time, everything is nil. This is a snippet of my code:
#IBOutlet var button1 : UIButton!;
#IBOutlet var button2 : UIButton!;
#IBOutlet var button3 : UIButton!;
#IBOutlet weak var containerForWebView: UIView!
var webView: WKWebView!
override func loadView()
{
}
override func viewDidLoad()
{
super.viewDidLoad()
displayWebPage()
}
override func viewWillAppear(_ animated: Bool)
{
super.viewWillAppear(animated)
}
override func viewDidLayoutSubviews()
{
super.viewDidLayoutSubviews()
}
private func displayWebPage()
{
webView = WKWebView()
webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
webView.frame = CGRect(origin: CGPoint.zero, size: containerForWebView.frame.size)
webView.navigationDelegate = self
containerForWebView.addSubview(webView)
let url = URL(string: "https://www.google.com")!
webView.load(URLRequest(url: url))
}
When the code calls the displayWebPage() method I break on the first line. In the debugger you can see all of the UIViewController properties are nil. The IBOutlets are Nil and the _view variable of the UIViewController itself is nil.
I don't understand why this is happening. Everything is pretty simple and easily connected. I never ran into this sort of issue in Objective-C. Any advice is appreciated!
Remove loadView implementation. Do not override that method, always use viewDidLoad instead.
If you override loadView then you are responsible for creating controller's view and assigning it to self.view.
I'm trying to change the title in a TableViewController from another ViewController. (see image)
The second ViewController is the one with the 3 cells and the third one is the one with a textfield (inputText in code), a button (changeText) and a label (outputLabel). I would like this app to remember what I put in the text field when I go back to the table view and then back into the ViewController. What happens now is:
- I change the text, hit the button and the label changes.
- I go back to the TableViewController and then I go into the ViewController that I was just in with a changed label
- The label is what it was before...
How can I make the app 'remember' what I put in in the text field and what the label was like? My code (ViewController.swift, I linked the 3rd controller to this file, haven't linked the 2nd controller to anything (yet?)):
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var outputLabel: UILabel!
#IBOutlet weak var inputText: UITextField!
#IBAction func changeText(_ sender: UIButton) {
outputLabel.text = inputText.text
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
Thanks in advance!
You can reference your ViewController in first controller (TableViewController),
make public inputText
#IBOutlet public weak var inputText: UITextField!
and in viewDidAppear get your text
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let text = ViewControllerVar.inputText.text //your text
}
I'm trying to check if a user is scrolling up and down on my app but it's not calling my scrollViewDidScroll method
Any ideas why it's not printing received scroll when I scroll up and down on the app?
import UIKit
class CreateAccount: UIViewController, UITextFieldDelegate, UIScrollViewDelegate {
#IBOutlet weak var scrollViewer: UIScrollView!
#IBOutlet weak var usernameTextField: UITextField!
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
#IBOutlet weak var reenterPasswordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func scrollViewDidScroll(scrollView: UIScrollView) {
print("received scroll")
}
}
Add the scrollview delegate. Whenever you implement a delegate method you need tell it what controller to use, usually it will be self. It's caught me out a few times.
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
scrollViewer.delegate = self
}
You need to set delegate of scrollview also don't use tag to differentiate 2 scrollview instead of that create 2 outlets of scrollview and use that in UIScrollViewDelegate methods like this.
func scrollViewDidScroll(scrollView: UIScrollView) {
if scrollView == scrollView1 {
print("received scrollview 1")
}
else if scrollView == scrollView2 {
print("received scrollview 2")
}
}
Delegate are given properly even if your scrollview delegate method not calling then please check you delegate method which you have added for scrollview, this may give warning due to using old swift version scrollview delegate with swift 4.0
Please correct it with below if this is the case:
Old Method:
func scrollViewDidScroll(scrollView: UIScrollView) {
}
New Method:
func scrollViewDidScroll(_ scrollView: UIScrollView) {
}
You can set the .delegate = self as Sarcoma suggests, or:
CTRL drag from scrollView in storyboard onto the File Owner (it is located in the view hierarchy list, actually it is right by the yellow circle icon by the name of your controller: [O] Create Account and choose
delegate
My LoginViewController has a UIView that has 2 UItextfield and 1 UIbutton. The moment the user start writting the UIView should go up and leave space for the keyboard. However my problem is when the keyboard disappear the UIView did not go at its initial position. Can anyone help me please Thank you ... (my code is below)
func keyboardON(sender: NSNotification) {
let info = sender.userInfo!
var keyboardSize = info[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue().size
println("keyboard height \(keyboardSize.height)")
var frame = otherContainerView.frame
println("MainScreen :\(UIScreen.mainScreen().bounds.height)")
frame.origin.y = UIScreen.mainScreen().bounds.height - keyboardSize.height - frame.size.height
otherContainerView.frame = frame
}
func keyboardNotOn(sender: NSNotification) {
let info = sender.userInfo!
var keyboardSize = info[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue().size
println("keyboard height \(keyboardSize.height)")
var frame = otherContainerView.frame
frame.origin.y = UIScreen.mainScreen().bounds.height - frame.size.height
otherContainerView.frame = frame
}
I would suggest that you change this view controller to a UITableViewController with static cells. When using a UITableViewController, the scrolling is automatically handled, thus making your problem not problem at all.
If I understand your initial question correctly, you are trying to create a login screen in a UIViewController, which is fine, but much harder than it would be to simply create a UITableViewController. The image above was made with a UITableViewController. When the text fields are selected, it slides up, and when they are deselected, it moves back to it's initial view. If you switch to a UITableViewController, (even if you place both UITextFields and the button in one cell), you won't need to do any of this programmatically. The storyboard will handle the desired changes.
import UIKit
class LoginTableViewController: UITableViewController {
#IBOutlet weak var usernameTextField : UITextField!
#IBOutlet weak var passwordTextField : UITextField!
#IBAction func login (sender: UIButton) {
//login button
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//If you choose to use 3 cells in your storyboard (like I've done with my login screen) you will return 3 here. If you choose to put all of the items in one cell, return 1 below.
return 3
}
}