I am very new to swift and I am stuck with the task described in the title.
My Problem:
I am building a product page programmatically, consisting of a few simple details and an offer button. Tapping offer button brings up an overlay on the view with some other details. You click "Ok" and the overlay disappears.
All good except the overlay does not disappear!
What I have tried:
func hideOverlay(_ sender: UIButton) {
containerView.backgroundColor = UIColor.white
buttonView.backgroundColor = UIColor.white
for subview in overlayView.subviews {
subview.removeFromSuperview()
}
}
Function is called on tapping the button within the overlayView. I will include the showOverlay function(working).
func showOverlay(_ sender: UIButton) {
//Load overlay view
let overlayHeight : CGFloat = 500
let overlayWidth : CGFloat = 290
let overlayView = UIView(frame: CGRect(x: centreView(masterView: view.frame.width, subView: overlayWidth), y: 64 + centreView(masterView: (view.frame.height - 64), subView: overlayHeight), width: overlayWidth, height: overlayHeight))
overlayView.backgroundColor = UIColor.white
let overlayTitle = UILabel(frame: CGRect(x: 0, y: 0, width: overlayWidth, height: overlayHeight*1/5))
overlayTitle.text = "Offer Taken"
overlayTitle.font = UIFont.boldSystemFont(ofSize: 35)
overlayTitle.textAlignment = .center
overlayView.addSubview(overlayTitle)
let overlayButtonView = UIView(frame: CGRect(x: 0, y: 0 + (overlayHeight * 4/5), width: overlayWidth, height: overlayHeight * 1/5))
overlayButtonView.backgroundColor = UIColor.red
let buttonWidth : CGFloat = 100
let buttonHeight : CGFloat = 35
let overlayButton = UIButton(type: UIButtonType.system)
overlayButton.frame = CGRect(x: centreView(masterView: overlayWidth, subView: buttonWidth), y: overlayButtonView.frame.origin.y + centreView(masterView: overlayButtonView.frame.height, subView: buttonHeight), width: buttonWidth, height: buttonHeight)
overlayButton.backgroundColor = UIColor.blue
overlayButton.setTitle("OK",for: .normal)
overlayButton.setTitleColor(UIColor.white, for: .normal)
overlayButton.setTitle("Offer Taken", for: .highlighted)
overlayButton.setTitleColor(UIColor.white, for: .highlighted)
overlayButton.addTarget(self, action: #selector(self.hideOverlay(_:)), for: .touchUpInside)
overlayView.addSubview(overlayButtonView)
overlayView.addSubview(overlayButton)
containerView.backgroundColor = UIColor(colorLiteralRed: 0, green: 0, blue: 0, alpha: 0.5)
buttonView.backgroundColor = UIColor(colorLiteralRed: 0, green: 0, blue: 0, alpha: 0.5)
view.addSubview(overlayView)
}
I have tried
overlayView.removeFromSuperview()
after the for loop, but I fear that overlayView.subviews is not correctly filled with the views I expect.
I appreciate anyone taking the time to help me, even if a little closer to a solution.
In func showOverlay(_ sender: UIButton) {...} you are creating a local variable "overlayView":
let overlayView = UIView(frame: ...)
You then add that as a subview to view. All that is fine, except you do not keep a reference to "overlayView" .. the view remains but you have no reference to it.
Add a class-level variable, outside of any function blocks:
var overlayView: UIView!
Then, inside func showOverlay(_ sender: UIButton) {...}, instead of let overlayView = just assign it to the existing variable:
overlayView = UIView(frame: ...)
When you're ready to remove it:
func hideOverlay(_ sender: UIButton) {
overlayView.removeFromSuperview()
}
and you're done :)
Try the viewWithTag method described in a similar thread here:
Swift addsubview and remove it
Related
I am adding custom navigation item to my application. But every time I navigate the items of navigation item overlaps. My code is
func fixNavBar(){
self.navigationItem.setHidesBackButton(true, animated: true)
let nav = self.navigationController?.navigationBar
let navView = UIView(frame: CGRect(x: 0, y: 0, width: (nav?.frame.width)!, height: (nav?.frame.height)!))
let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: navView.frame.height, height: navView.frame.height))
backButton.imageView?.contentMode = .scaleToFill
backButton.setImage(UIImage(systemName: "chevron.left"), for: .normal)
backButton.setTitleColor(UIColor(rgb: 0x23C0FF), for: .normal)
backButton.tintColor = UIColor(rgb: 0x23C0FF)
nav?.addSubview(navView)
backButton.addTarget(self, action: #selector(goBack), for: .touchUpInside)
navView.backgroundColor = .clear
let imageView = UIImageView(frame: CGRect(x: backButton.frame.width+5, y: 0, width: navView.frame.height-2, height: navView.frame.height-2))
let profUrl = URL(string: "\(selectedUser.profilePictuer)")
imageView.kf.setImage(with: profUrl)
let userLbl = UILabel(frame: CGRect(x: backButton.frame.width + 15 + imageView.frame.width, y: 0, width: 150, height: navView.frame.height))
userLbl.font = UIFont(name: UIFont.fontNames(forFamilyName: "Ubuntu")[0], size: 17)
userLbl.text = selectedUser.fullName
userLbl.textAlignment = .left
userLbl.textColor = .black
navView.addSubview(imageView)
navView.addSubview(userLbl)
navView.addSubview(backButton)
imageView.layer.cornerRadius = imageView.frame.height/2
imageView.layer.masksToBounds = true
}
#objc func goBack(sender: UIButton!) {
self.navigationController!.popViewController(animated: true)
}
override func viewDidLoad() {
super.viewDidLoad()
fixNavBar()
}
This is root view controller when where I select any chat to open
When I select chat for first time I get something like that
And when select second chat it does not remove previous user's name but overlaps it
Your root and child view controller has the same navigationcontroller so when everytime you call fixNavBar , some views appending on the previous .
First option is adding nav?.subviews.forEach({$0.removeFromSuperview()}) on the top of your function like #Raja's comment.
Second is go storyboard and embed a new navigationController to your child viewcontroller(where yout function is)
I'm trying to create a welcome onboarding for the first time users but none of the views are loafing in the simulator, all I'm getting is a red background when the onboardingVC gets presented. Can anyone see the issue as to why the titles, buttons, and images won't appear?
This is the message I'm getting in the console:
Warning: Attempt to present <EMA.WalkthroughVC: 0x7faa2401e5b0> on <EMA.HomeVC: 0x7faa22407e00> whose view is not in the window hierarchy!
FOUND ALL!!
let holderView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = true
view.backgroundColor = .darkGray
return view
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
view.backgroundColor = UIColor.red
configure()
}
private func configure() {
let scrollView = UIScrollView(frame: holderView.bounds)
holderView.addSubview(scrollView)
let titles = ["Hi","Welcome","real nigga"]
for x in 0..<3 {
let pageView = UIView(frame: CGRect(x: CGFloat(x) * holderView.frame.size.width, y: 0, width: holderView.frame.size.width, height: holderView.frame.size.height))
scrollView.addSubview(pageView)
let label = UILabel(frame: CGRect(x: 10, y: 10, width: pageView.frame.size.width-20, height: 120))
let imageView = UIImageView(frame: CGRect(x: 10, y: 10+120+10, width: pageView.frame.size.width-20, height: pageView.frame.size.height - 60 - 130 - 15))
let button = UIButton(frame: CGRect(x: 10, y: pageView.frame.size.height - 60, width: pageView.frame.size.width-20, height: 50))
label.textAlignment = .center
label.font = UIFont.systemFont(ofSize: 16, weight: .semibold)
pageView.addSubview(label)
label.text = titles[x]
imageView.contentMode = .scaleAspectFill
imageView.image = UIImage(named: "BankCard\(x)")
pageView.addSubview(imageView)
button.setTitleColor(.red, for: .normal)
button.backgroundColor = .black
button.setTitle("Continue", for: .normal)
if x == 2 {
button.setTitle("Get Started", for: .normal)
}
button.addTarget(self, action: #selector(didTapButton), for: .touchUpInside)
pageView.addSubview(button)
}
}
#objc func didTapButton(_ button: UIButton) {
}
}
"whose view is not in the window hierarchy"
you didn't add the views that you created to the main view try to add the subviews to the main by using this one
self.view.addSubview(holderView)
also don't forget to add the frame for the holder view like that
UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
view.translatesAutoresizingMaskIntoConstraints = true
and inside the view did load
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
self.view.addSubview(holderView)
}
I'v added two UIViewControllers inside of a UIScrollView, and now I'm trying to add targets to the button inside of the UIViewControllers, I've checked the internet but none of those solutions worked for me, this is what I'm doing
inside of the main ViewController
scrollView.contentSize = CGSize(width: view.frame.width * 2, height:0)
let postsViewController = PostsViewController()
postsViewController.scrollView = scrollView
postsViewController.view.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
let chatsViewController = ChatsViewController()
chatsViewController.scrollView = scrollView
chatsViewController.view.frame = CGRect(x: view.frame.width, y: 0, width: view.frame.width, height: view.frame.height)
scrollView.addSubview(postsViewController.view)
scrollView.addSubview(chatsViewController.view)
postsViewController.didMove(toParent: self)
chatsViewController.didMove(toParent: self)
then inside the postsViewController I'm doing this
let a = UIButton()
a.setImage(currentTheme.chat, for: .normal)
a.imageEdgeInsets = UIEdgeInsets(top: 1.5, left: 0.0, bottom: 1.5, right: 0.0)
view.addSubview(a)
view.addConstraint("V:|-200-[v0(80)]-0-|",a)
view.addConstraint("H:|-200-[v0(80)]-0-|",a)
a.addTarget(self, action: #selector(abc), for: .touchUpInside)
the add "addConstraint" is an extension function just to add constraint to views
the abc function
#objc func abc() {
print("hello")
}
you can see the scrollView setting here
https://ibb.co/ZB1LJsy
Try to initialize your button like this
let a : UIButton = UIButton(type: .custom)
And add this after to the initialize of your UIScrollView
scrollView.delaysContentTouches = false
I tested in an xcode project. I can not execute the function (button) in the other UIViewController.
By cons if you sent the #selector it works.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let scrollView : UIScrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.width))
scrollView.delaysContentTouches = false
view.addSubview(scrollView)
let TestViewController = TestViewController1()
TestViewController.select = #selector(demande(sender:))
TestViewController.view.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
scrollView.addSubview(TestViewController.view)
print("dd")
}
#objc func demande(sender: UIButton!) {
print("button click", sender.tag)
}
}
class TestViewController1: UIViewController {
var select : Selector!
override func viewDidLoad() {
super.viewDidLoad()
let button : UIButton = UIButton(type: .custom)
button.setImage(#imageLiteral(resourceName: "turn_off_on_power-512"), for: .normal)
button.tag = 2
button.addTarget(self, action: select, for: .touchUpInside)
button.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
view.addSubview(button)
}
}
Hoping that it helps you
okay, I solved my problem, the reason why the button wasn't getting trigger is because I forgot to attach the viewController of the view to the scrollview, so all I had to do is to attach the viewController as well and it worked.
self.addChild(postsViewController)
self.addChild(chatsViewController)
now it is working.
I am building an app and I am required to have 3 tabs if you click on the first tab, its a tableview, second tab a different tableview, third tab, TextView, here is an image of what I am trying to do:
Every time I google looking for examples of something like this, I get referred to UITabBarController, I don't think a tab bar is what I am looking for.
What you are looking for is called Segmented Control (UISegmentedControl).
You can see it in Action natively e.g. in both the Apple iTunes and Health App.
Instead of performing segues to different views with the UITabBarController, you can, using Interface Builder, connect it to your UIViewController like so
#IBOutlet weak var segmentedControl: UISegmentedControl!
and in
viewDidLoad() {
switch segmentedControl.selectedIndex {
case 0: // Do something on your first picture
someFunction()
case 1: // Do something on your second picture
performSegue(withIdentifier: "your identifier here", sender: nil)
case 2: // Do something on your third picture
image.isHidden = true
button.isEnabled = false
default: break
}
... etc. You could also initiate different View Controllers instead of manipulating just one View, which you can then access via segues.
Please see official Swift doc # https://developer.apple.com/documentation/uikit/uisegmentedcontrol?changes=_3
I would create this layout programmatically. You want a custom look to it so I do not think the standard controls are your best option.
Here is a playground to get you started on one way this could be achieved:
import UIKit
import PlaygroundSupport
class ViewController: UIViewController {
let view1 = UIView(frame: CGRect(x: 0, y: 100, width: 768, height: 924))
let view2 = UIView(frame: CGRect(x: 0, y: 100, width: 768, height: 924))
let view3 = UIView(frame: CGRect(x: 0, y: 100, width: 768, height: 924))
override func viewDidLoad() {
super.viewDidLoad()
self.view.frame = CGRect(x: 0, y: 0, width: 768, height: 1024)
self.view.backgroundColor = .black
// View to have a border around the buttons
let box = UIView(frame: CGRect(x: 40, y: 20, width: 300, height: 50))
box.layer.borderColor = UIColor.white.cgColor
box.layer.borderWidth = 2
self.view.addSubview(box)
// Tab buttons
let button1 = UIButton(frame: CGRect(x: 40, y: 20, width: 100, height: 50))
button1.setTitle("Orange", for: .normal)
button1.tag = 1
button1.addTarget(self, action: #selector(tabTouched(sender:)), for: .touchUpInside)
self.view.addSubview(button1)
let button2 = UIButton(frame: CGRect(x: 140, y: 20, width: 100, height: 50))
button2.setTitle("Blue", for: .normal)
button2.tag = 2
button2.addTarget(self, action: #selector(tabTouched(sender:)), for: .touchUpInside)
self.view.addSubview(button2)
let button3 = UIButton(frame: CGRect(x: 240, y: 20, width: 100, height: 50))
button3.setTitle("Green", for: .normal)
button3.tag = 3
button3.addTarget(self, action: #selector(tabTouched(sender:)), for: .touchUpInside)
self.view.addSubview(button3)
// Tab Views
view1.backgroundColor = .orange
self.view.addSubview(view1)
view2.backgroundColor = .blue
view2.alpha = 0
self.view.addSubview(view2)
view3.backgroundColor = .green
view3.alpha = 0
self.view.addSubview(view3)
}
// When each of the buttons are tapped we will hide or show the correct tab's view
#objc func tabTouched(sender: UIButton) {
if sender.tag == 1 {
UIView.animate(withDuration: 0.3) {
self.view1.alpha = 1
self.view2.alpha = 0
self.view3.alpha = 0
}
} else if sender.tag == 2 {
UIView.animate(withDuration: 0.3) {
self.view1.alpha = 0
self.view2.alpha = 1
self.view3.alpha = 0
}
} else if sender.tag == 3 {
UIView.animate(withDuration: 0.3) {
self.view1.alpha = 0
self.view2.alpha = 0
self.view3.alpha = 1
}
}
}
}
PlaygroundPage.current.needsIndefiniteExecution = true
PlaygroundPage.current.liveView = ViewController()
You can copy and paste this into an empty playground to see it in action. Essentially this is showing or hiding the appropriate views based on which button is selected. You can swap out the views for view controllers if you so desire.
I was wondering the best approach to put an image into the navigation bar.
My initial thought was to create a cocoa touch class for UINavigationController and set it up that way, but I can seem to get it to working using the below code:
class NavBarImage: UINavigationController {
override func awakeFromNib() {
}
override func prepareForInterfaceBuilder() {
super.prepareForInterfaceBuilder()
self.setupView()
}
func setupView()
{
let navController = navigationController!
let image = #imageLiteral(resourceName: "BarTabsNavLogoWhite")
let imageView = UIImageView(image: image)
let bannerWidth = navController.navigationBar.frame.size.width
let bannerHeight = navController.navigationBar.frame.size.height
let bannerX = bannerWidth / 2 - image.size.width / 2
let bannerY = bannerHeight / 2 - image.size.height / 2
imageView.frame = CGRect(x: bannerX, y: bannerY, width: bannerWidth,
height: bannerHeight)
imageView.contentMode = .scaleAspectFit
navigationItem.titleView = imageView
}
}
I keep getting an "unexpectedly found nil while unwrapping an optional value" on let navController = navigationController!.
However, this method has also been working for me too. I created a cocoa touch class for UINavigationBar and used this code below:
import UIKit
class NavBarImg: UINavigationBar {
override init(frame: CGRect) {
super.init(frame: frame)
initialise()
}
required init(coder aDecoder: NSCoder){
super.init(coder: aDecoder)!
initialise()
}
func initialise(){
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 225, height: 40))
imageView.contentMode = .scaleAspectFit
let image = UIImage(named:"BarTabsNavLogoWhite")
imageView.image = image
imageView.frame.origin = CGPoint(x: self.superview?.center.x, y: self.superview?.center.y)
addSubview(imageView)
}
}
The only problem with this is that on different iPhones I cant figure out how to get the image to always be centered on any device using CGPoint.
Then for the last method I found and implemented is done by the code below:
#IBDesignable class test: UINavigationBar { #IBInspectable var imageTitle: UIImage? = nil {
didSet {
guard let imageTitle = imageTitle else {
topItem?.titleView = nil
return
}
let imageView = UIImageView(image: imageTitle)
imageView.frame = CGRect(x: 0, y: 0, width: 40, height: 30)
imageView.contentMode = .scaleAspectFit
topItem?.titleView = imageView
}
}
}
I really like this method because with the IBDesignable function you can see it in the storyboard. However the way I have my viewcontrollers set up with tableviews, after i go past the first view controller, the navigation bar image disappears in all other view controllers when I run the simulator.
Looking for advice to see which method is the best approach and how to possibly solve the problems I am having. Or if anyone has a different method that they have found that works, id love to see how it works!
you can simply add a image or customize the barbutton as follows:
let button = UIButton(type: .custom)
button.setImage(UIImage(named: "icon_right"), for: .normal)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
button.frame = CGRect(x: 0, y: 0, width: 53, height: 31)
button.imageEdgeInsets = UIEdgeInsetsMake(-1, 32, 1, -32)//move image to the right
let label = UILabel(frame: CGRect(x: 3, y: 5, width: 20, height: 20))
label.font = UIFont(name: "Arial-BoldMT", size: 16)
label.text = "title"
label.textAlignment = .center
label.textColor = .black
label.backgroundColor = .clear
button.addSubview(label)
let barButton = UIBarButtonItem(customView: button)
self.navigationItem.rightBarButtonItem = barButton