hey guys just wondering if you could help me debug this, this error comes up but only when i add a ui text view to a view controller here is everything i have for the view controller code as you can see i tried dispatchQueue but doesn't do anything.
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
DispatchQueue.main.async {
weak var textview: UITextView!
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Declare variable out side the viewDidLoad
import UIKit
class ViewController: UIViewController {
var textview: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
It looks like you're working with this controller from not-main thread. I think that you're trying to show the controller from some closure or async call. You have to ensure that your UI calls only from main thread.
Also you can debug it. Before you create/instantiate this controller set breakpoint and pay attention on debug navigator in XCode, you will be able to see where the program stopped, is this main thread or not.
Related
I haven't done much iOS development in a while and while updating an old project I came across a question I couldn't find an answer for.
What is the replacement for
actionSheet:willDismissWithButtonIndex:
(emphasis on WILL)
I have some animation code that needs to execute at this point and currently I can only see how to execute my code after the sheet has been dismissed.
I'm sure the answer is right in front of my face, I just can't see it.
You can create a custom UIAlertController with a delgate and use that
import UIKit
#objc protocol CustomAlertControllerDelegate {
#objc optional func CustomAlertControllerWillDismiss(controller: CustomAlertController)
}
class CustomAlertController: UIAlertController {
weak var delegate:CustomAlertControllerDelegate?
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.
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.delegate?.CustomAlertControllerWillDismiss!(controller: self)
}
}
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 want to make something like below snapshots.
When I click on profile tab bar instead of opening a new view controller it shows a side menu. Is it something that has been handled on click of tabbar ?
if you want to achieve something like your screenShot then you are using a wrong library, because when you show your right viewController the front viewController go to left by amount of width of your right viewController, but anyways here is the code for what you need to do
first you need to put your viewController as delegate of your TabBarViewController and in func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool you need to return false and call the method of SWRevealViewController to show right viewController rightRevealToggleAnimated(true)
class FirstViewController: UIViewController,SWRevealViewControllerDelegate,UITabBarControllerDelegate {
#IBOutlet weak var sliderControl: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.revealViewController().delegate = self
self.tabBarController?.delegate = self
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
//self.view.removeGestureRecognizer(self.revealViewController().panGestureRecognizer())
//self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool {
//checking for specific viewController
if(viewController is DesiredViewControllerClass) {
self.revealViewController().rightRevealToggleAnimated(true)
}
return false
}
}
I hope this helps you, regards
You can use the tab bar delegate:
extension ViewController: UITabBarDelegate {
func tabBar(tabBar: UITabBar, didSelectItem item: UITabBarItem) {
// Present hamburger menu
}
}
Open ViewController.swift for editing, and before viewDidLoad() put the code below the question into the default code of ViewController.Swift?
How do I put these 4 lines of code below using the directions above into the default code for ViewController.Swift?
override func loadView() {
webView = WKWebView()
webView.navigationDelegate = self
view = webView
}
Default code ViewController.Swift:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
I'm guessing you have a storyboard in which ViewController is defined. If so, you must not override loadView():
If you use Interface Builder to create your views and initialize the view controller, you must not override this method.
(from UIViewController class reference)
Instead edit the class of the view in the storyboard and set it to WKWebView. To get the webView reference, create it as an outlet:
#IBOutlet weak var webView: WKWebView!
And link it as a referencing outlet to the view in the storyboard.
(Or you could just put the WKWebView inside the default UIView; would be simpler. You could do this either programmatically in viewDidLoad() or via the storyboard.)
Or if you don't have a storyboard, then just copypaste the code into the editor inside the class but outside the existing functions?
import UIKit
class ViewController: UIViewController {
override func loadView() {
webView = WKWebView()
webView.navigationDelegate = self
view = webView
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
However, it matters not where the func goes in the class:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func loadView() {
webView = WKWebView()
webView.navigationDelegate = self
view = webView
}
}
I'm a beginner at all of this...Having said that I've come across a point in my app where I've stalled and don't know what to do or fix next. So any answers would be appreciated!
So in my Home View Controller, I have four buttons with four different categories.
Each of these categories has its own question list, but they have a common "General Question" list. The general question list has its own view controller.
When you click on any of the four buttons, it brings you to the General Question view. At the bottom of this view, I have a "Next" button.
Goal: Configure the Next button to continue to one of the category's question list based on what is initially pressed in the Home View Controller.
I've connected the buttons via outlet and action in the View Controller.
However, the Next button will not connect when I control + drag into the View Controller. I'm not sure where I need to put the code for this...
I was thinking that the code for the Next button might need to have some kind of conditional statement, but since it won't connect I can't even get that far.
Help!
(This is what I have) Sample Code:
import UIKit
import AddressBookUI
import AddressBook
import Foundation
import CoreData
import CoreGraphics
import EventKit
import EventKitUI
import CoreFoundation
class ViewController: UIViewController {
#IBOutlet var ColorButton: UIButton!
#IBOutlet var StyleButton: UIButton!
#IBOutlet var CutButton: UIButton!
#IBOutlet var MakeupButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
var eventstore: EKEventStore!
var event: EKEvent!
weak var editViewDelegate: EKEventEditViewDelegate!
#IBAction func ColorButtonPressed(sender: UIButton) {
}
#IBAction func StyleButtonPressed(sender: UIButton) {
}
#IBAction func HaircutButtonPressed(sender: UIButton) {
}
#IBAction func MakeupButtonPressed(sender: UIButton) {
}
}
Here is a suggested approach as shown in the code below for 2 controllers (instead of 4) for brevity. Use appropriate named segues to each of the "next processing" controllers from the common processing controller and set up a chain. Here is a link to the project file: Project file
import UIKit
class ViewController: UIViewController {
var nextVcId = 0 // defines the button that is pressed
#IBAction func unwindFromOtherControllers(segue: UIStoryboardSegue) {
// In case you want to get back to the main VC
}
#IBAction func btn2Action(sender: UIButton) {
nextVcId = 0
self.performSegueWithIdentifier("commonSegue", sender: sender)
}
#IBAction func btn1Action(sender: UIButton) {
nextVcId = 1
self.performSegueWithIdentifier("commonSegue", sender: sender)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let vc = segue.destinationViewController as! CommonViewController
vc.nextControllerId = nextVcId
}
}
import UIKit
class CommonViewController: UIViewController {
var nextControllerId = 0
#IBOutlet weak var StatusLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.StatusLabel.text = "Common"
commonProcessing()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func commonProcessing() {
// do your common processing
if nextControllerId == 0 {
performSegueWithIdentifier("next1Segue", sender: self)
} else {
performSegueWithIdentifier("next2Segue", sender: self)
}
}
}
import UIKit
class Next1ViewController: UIViewController {
#IBOutlet weak var statusLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.statusLabel.text = "Next1"
next1Processing()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func next1Processing() {
println("Next 1 Processing")
}
}
import UIKit
class Next2ViewController: UIViewController {
#IBOutlet weak var statusLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
statusLabel.text = "Next 2"
next2Processing()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func next2Processing() {
println("Next 2 Processing")
}
}
processing