This code loads a webpage using WKWebview. This is swift for IOS. When one clicks the button what I would like it to do is scroll down specifically on a kindle book. When I load most web pages, I can scroll down using the button. But when I try to use the button to scroll down on my kindle books (using the online viewer), it does not work. I am not getting an error it simply does not scroll down. I have tried scrollview (shown).
Are there any solutions here?
class ViewController: UIViewController {
let webView = WKWebView()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(webView)
guard let url = URL(string: "https://read.amazon.com/kindle-library") else {
return
}
webView.load((URLRequest(url: url)))
let button = UIButton()
button.setTitle("ScanPage", for: .normal)
button.backgroundColor = .systemOrange
view.addSubview(button)
button.frame = CGRect(x: 50, y: 50, width: 100, height: 50)
button.layer.cornerRadius = 20
button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
}
#objc func buttonTapped(){
var scrollPoint = self.view.convert(CGPoint(x: 0, y: 0), to: webView.scrollView)
scrollPoint = CGPoint(x: scrollPoint.x, y: 600)
webView.scrollView.setContentOffset(scrollPoint, animated: true)
}
}
Related
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 have a tableView which launches a URL after the cell was pressed. I am creating webView for it:
var webView = UIWebView(frame: self.view.bounds)
webView.scalesPageToFit = true
view.addSubview(webView)
let request = URLRequest(url: catPictureURL!)
webView.loadRequest(request)
webViewDidStartLoad(webView)
And I have a function to create a close button in it:
func webViewDidStartLoad(_ webView: UIWebView){
print("JUHUUU")
var subView = UIView()
subView.frame.size.height = 10
subView.frame.size.width = 10
subView.frame = CGRect(x: 0, y: 50, width: 100 , height: 100)
let button = UIButton(type: .system)
button.frame = CGRect(x: 0, y: 50, width: 100, height: 100)
button.backgroundColor = UIColor.red
button.setTitle("CANCEL", for: [])
button.addTarget(self, action: #selector(webView.removeFromSuperview), for: UIControlEvents.touchUpInside)
self.view.addSubview(button)
webView.addSubview(subView)
//subView.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Done, target: self, action: "dismiss")
}
I have tried in button.addTarget to close the webView and show previous screen, but the
action: #selector(webView.removeFromSuperview)
is removing rootView - not the webView (which is causing crashes). I don't really know how to get webView closed.
PS. I have also tried doing #selector("dismiss") and preparing a function with self.dismiss but the result is the same.
Your actions target is self( which is your vc) . Set target to webView
Self should be changed to webView in order to close it.
button.addTarget(webView, action: #selector(webView.removeFromSuperview), for: UIControlEvents.touchUpInside)
I'm putting together an iOS app (using Swift) that contains a webview. A user will click on a video in the webview and the video will load, at which time I want to display a button on the video. I've been able to display the button but it is not responding to touches and I'm not sure why. I made the button huge just to make sure it was being hit. Here's my code. I extended AVPlayerViewController.
Thanks in advance for your time and patience.
extension AVPlayerViewController {
open override func viewDidLoad() {
let btn = UIButton(type: .roundedRect)
btn.backgroundColor = UIColor.red
btn.setTitle("Do stuff", for: .normal)
btn.frame = CGRect(x: 0, y: 330, width: 300, height: 300)
btn.addTarget(self, action: #selector(self.pressButton(button:)), for: .touchUpInside)
btn.isUserInteractionEnabled = true
btn.isEnabled = true
btn.clipsToBounds = true
self.contentOverlayView?.addSubview((btn as? UIButton)!)
self.showsPlaybackControls = false
}
func pressButton(button: UIButton) {
print("Worked")
}
}
In your extension of AVPlayerViewController, you have overridden viewDidLoad method, which is not correct in my view. Instead you can add the button adding logic in the extension and call that method eherever ypu have initialized the AVPlayerViewController.
extension AVPlayerViewController {
func addButton() {
let btn = UIButton(type: .roundedRect)
btn.backgroundColor = UIColor.red
btn.setTitle("Do stuff", for: .normal)
btn.frame = CGRect(x: 0, y: 330, width: 300, height: 300)
btn.addTarget(self, action: #selector(self.pressButton(button:)), for: .touchUpInside)
btn.isUserInteractionEnabled = true
btn.isEnabled = true
btn.clipsToBounds = true
self.contentOverlayView?.addSubview((btn as? UIButton)!)
self.showsPlaybackControls = false
}
func pressButton(button: UIButton) {
print("Worked")
}
}
I'm new to Swift and have a hard time understand the event flow. The code below can be run directly in an xcode playground. I have a white UIView in the background. This view has a brown button and a red view as sub-views. Click on them and the events are logged in the controller, just as expected.
But the controller of this white view also adds another view, that has it's own controller class (SubviewController). SubviewController is green and has a blue subview with a black button. Question is... why don't I get any logs from the green, blue and black views/buttons?
import Foundation
import UIKit
import PlaygroundSupport
class TestViewController : UIViewController {
let playButton: UIButton = {
let playButton = UIButton(frame: CGRect(x: 155, y: 135, width: 160, height: 40))
playButton.setTitle("BROWN BUTTON", for: .normal)
playButton.backgroundColor = UIColor.brown
return playButton
}()
override func loadView() {
let viewWhite = UIView()
viewWhite.backgroundColor = UIColor.white
let viewRed = UIView()
viewRed.backgroundColor = UIColor.red
viewRed.frame = CGRect(x: 20, y: 20, width: 40, height: 10)
viewRed.clipsToBounds = true
let recognizer2 = UITapGestureRecognizer(target: self, action: #selector (self.handleTapRed(_:)))
viewRed.addGestureRecognizer(recognizer2)
let recognizer = UITapGestureRecognizer(target: self, action: #selector (self.handleTap(_:)))
viewWhite.addGestureRecognizer(recognizer)
playButton.addTarget(self, action: #selector (self.action) , for: .touchUpInside)
let catList = SubviewController()
viewWhite.addSubview(catList.view)
viewWhite.addSubview(playButton)
viewWhite.addSubview(viewRed)
self.view = viewWhite
}
func action() {
print("Brown button tapped")
}
func handleTap(_ sender:UITapGestureRecognizer){
print("WHITE VIEW (background view) TAPPED")
}
func handleTapRed(_ sender:UITapGestureRecognizer){
print("RED VIEW TAPPED")
}
}
class SubviewController: UIViewController {
let buttonBlack: UIButton = {
let button = UIButton(frame: CGRect(x: 40, y: 10, width: 170, height: 20))
button.backgroundColor = UIColor.black
button.setTitle("BLACK BUTTON", for: .normal)
return button
}()
let viewBlue: UIView = {
let v = UIView()
v.backgroundColor = UIColor.blue
v.frame = CGRect(x: 20, y: 40, width: 240, height: 60)
v.clipsToBounds = true
return v
}()
override func loadView() {
super.loadView()
self.view.backgroundColor = UIColor.green
buttonBlack.addTarget(self, action: #selector (self.blackKlick) , for: .touchUpInside)
self.view.addSubview(viewBlue)
self.view.frame = CGRect(x: 0, y: 40, width: 240, height: 60)
self.view.clipsToBounds = true
self.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector (self.handleTapGreen(_:))))
viewBlue.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector (self.handleTapBlue(_:))))
viewBlue.addSubview(buttonBlack)
}
func blackKlick() {
print("Black button tapped")
}
func handleTapBlue(_ sender:UITapGestureRecognizer){
print("BLUE VIEW TAPPED")
}
func handleTapGreen(_ sender:UITapGestureRecognizer){
print("GREEN VIEW TAPPED")
}
}
PlaygroundPage.current.liveView = TestViewController()
Thanks for any help!
This line in your current code:
let catList = SubviewController()
creates a local instance of SubvieController. As soon as you exit the loadView() func, that instance is gone.
So, you need a class-level variable to keep that instance around. Add this line:
class TestViewController : UIViewController {
var catList: SubviewController!
and then remove the let from the instantiation line in loadView():
catList = SubviewController()
I am writing my first Swift app for quiz. Each question has random way to render on screen as below screenshot.
I am programming app without story board ie. programmatically. I want to create simple pagination flow for each question within single viewcontroller without using Collocationview, Tableview or navigation.
What I did so far? I have simple viewcontroller with UIView() added as subview. I am adding question components dynamically. Now once user click on continue I wanted remove subview and add new subview with new question. I am able to remove subview but contents on subview seems to be still there as I can see its overwriting.
To get more clarification please view my code.
import UIKit
class QuizController: UIViewController {
let subView = UIView()
var currentQuestion:Int = 1;
let questions = ["This is question 1", "Hello to question 2", "Question 3"]
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .white
setup_layout()
}
func setup_layout(){
let closeBtn = UIButton(frame: CGRect(x: 5, y: 10, width: 200, height: 50))
closeBtn.backgroundColor = UIColor.red
closeBtn.setTitle("Close", for: .normal)
closeBtn.addTarget(self, action: #selector(close), for: .touchUpInside)
view.addSubview(closeBtn)
//dynamic view
create_subview()
}
func nextQuestion(){
print("Show next")
if let viewWithTag = self.view.viewWithTag(currentQuestion) {
viewWithTag.removeFromSuperview()
currentQuestion += 1;
create_subview()
} else {
print("No!")
}
}
func create_subview(){
let heightOfView = view.frame.size.height
let widthOfView = view.frame.size.width
subView.tag = currentQuestion
subView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.2)
subView.frame = CGRect(x: 0, y: 60, width: self.view.frame.width, height: heightOfView - 60)
self.view.addSubview(subView)
let txtLabel1 = UILabel(frame: CGRect(x: 35, y: 120, width: widthOfView , height: 20))
txtLabel1.text = questions[currentQuestion-1]
txtLabel1.font = txtLabel1.font.withSize(12)
subView.addSubview(txtLabel1)
let nextBtn = UIButton(frame: CGRect(x: 5, y: 300, width: 200, height: 50))
nextBtn.backgroundColor = UIColor.red
nextBtn.setTitle("Continue", for: .normal)
nextBtn.addTarget(self, action: #selector(nextQuestion), for: .touchUpInside)
subView.addSubview(nextBtn)
}
func close(){
self.dismiss(animated: true, completion: nil)
}
}
And this is what I see which I click continue.
NOTE: Initially thought using Collocation or Table view will be more appropriate as I can set to scroll horizontally for each question and fetch questions using REST API and place to each cell. But I want to present next screen to user only once then click on continue. I guess with collectionview user can move to next screen on swipe.
Just found the answer. I assumed removing subview will also remove all components on subview by itself ie. UILable and UIButton in my case.
I have to remove them separately.
for subview in self.subView.subviews {
subview.removeFromSuperview()
}
Now i can add tag to components and remove like this:
for subview in self.subView.subviews {
if (subview.tag == 1) {
subview.removeFromSuperview()
}
}
Why are you removing superviews and adding again and again??
Simply change UILabel.text :)