I have a custom nav item
lazy var closeBtn: UIBarButtonItem = {
let closeBtn = UIButton(frame: CGRect(x: 0, y: 0, width: 24, height: 24))
closeBtn.setBackgroundImage(UIImage.init(named: "icClose")!.withRenderingMode(.alwaysOriginal), for: .normal)
closeBtn.addTarget(self, action: #selector(handleClose), for: .touchUpInside)
let leftBtn = UIBarButtonItem(customView: closeBtn)
leftBtn.imageInsets = UIEdgeInsets(top: -1, left: 10, bottom: 0, right: 0)
return leftBtn
}()
So on scroll, i want to change a scale of this item
func scrollViewDidScroll(_ scrollView: UIScrollView) {
self.navigationItem.leftBarButtonItem?.customView?.transform = CGAffineTransform(scaleX: value, y: value)
}
It just doesn't do anything. Fun thing is that the same code works inside UIView.Animate
func scrollViewDidScroll(_ scrollView: UIScrollView) {
UIView.animate(withDuration: 0.2) {
self.navigationItem.leftBarButtonItem?.customView?.transform = CGAffineTransform(scaleX: value, y: value)
}
}
But i want to transform it immediately based on offset value.
Related
I am following a tutorial to create a swift app that adds a number of views to a scroll view and then allows me to scroll between them. I have the app working and understand it for the most part. When I change the orientation of the device the views width don't get updated so I have parts of more than one view controller on the screen? Does anybody know how to fix this? From my understanding I need to call something in the viewsDidTransition method to redraw the views. Any help would be greatly appreciated. Thanks!
Here is what I have so far:
import UIKit
class ViewController: UIViewController {
private let scrollView = UIScrollView()
private let pageControl: UIPageControl = {
let pageControl = UIPageControl()
pageControl.numberOfPages = 5
pageControl.backgroundColor = .systemBlue
return pageControl
}()
override func viewDidLoad() {
super.viewDidLoad()
scrollView.delegate = self
pageControl.addTarget(self,
action: #selector(pageControlDidChange(_:)),
for: .valueChanged)
scrollView.backgroundColor = .red
view.addSubview(scrollView)
view.addSubview(pageControl)
}
#objc private func pageControlDidChange(_ sender: UIPageControl){
let current = sender.currentPage
scrollView.setContentOffset(CGPoint(x: CGFloat(current) * view.frame.size.width,
y: 0), animated: true)
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
pageControl.frame = CGRect(x: 10, y: view.frame.size.height - 100, width: view.frame.size.width - 20, height: 70)
scrollView.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height - 100)
if scrollView.subviews.count == 2 {
configureScrollView()
}
}
private func configureScrollView(){
scrollView.contentSize = CGSize(width: view.frame.size.width*5, height: scrollView.frame.size.height)
scrollView.isPagingEnabled = true
let colors: [UIColor] = [.systemRed, .systemGray, .systemGreen, .systemOrange, .systemPurple]
for x in 0..<5{
let page = UIView(frame: CGRect(x: CGFloat(x) * view.frame.size.width, y: 0, width: view.frame.size.width, height: scrollView.frame.size.height))
page.backgroundColor = colors[x]
scrollView.addSubview(page)
}
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
print("hello world")
}
}
extension ViewController: UIScrollViewDelegate {
func scrollViewDidScroll(_ scrollView: UIScrollView) {
pageControl.currentPage = Int(floorf(Float(scrollView.contentOffset.x) / Float(scrollView.frame.size.width)))
}
}
Does anyone know how I can move a back button image to the edge of the screen?
This is what it looks like right now:
and this is how I want it to look:
If you add custom view as a button and add as leftBarButtonItem it always takes default x (frame's start position) position for that view as defined for navigation bar item. You can add something like this to get your desired output:
class AnotherViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
addBackButton()
}
func addBackButton() {
let containerView = UIView(frame: CGRect(origin: .zero, size: CGSize(width: 200, height: 50)))
let btnBack = UIButton(frame: CGRect(x: -25, y: 0, width: 45, height: 45))
btnBack.setImage(UIImage(named: "dark_ic_back.png")?.withRenderingMode(.alwaysTemplate), for: .normal)
btnBack.tintColor = .black
btnBack.addTarget(self, action: #selector(self.backAction(_:)), for: .touchUpInside)
containerView.addSubview(btnBack)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: containerView)
}
#objc func backAction(_ sender: UIButton) {
self.navigationController?.popViewController(animated: true)
}
}
Output:
Try to change its insets:
self.navigationController?.navigationBar.backItem?.backBarButtonItem?.imageInsets = UIEdgeInsets(top: 0, left: -12, bottom: 0, right: 12)
and find values to move it right to the edge.
hi fellow developer I want to swipe between uiview with scrollView while changing the the index and small indicator move left and right. but is not responding while I try to swipe. this is my picture and my setup to scroll between uiview. can you tell me where I am missing?
let segmentedControl = UISegmentedControl()
let containerView = UIView()
let indicatorView = UIView()
let leftView = UIView()
let rightView = UIView()
let scrollView = UIScrollView()
var slides = [UIView]()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemBackground
slides.append(leftView)
slides.append(rightView)
segmentedControl.insertSegment(withTitle: "Harian", at: 0, animated: true)
segmentedControl.insertSegment(withTitle: "Mata Pelajaran", at: 1, animated: true)
segmentedControl.selectedSegmentIndex = 0
segmentedControl.addTarget(self, action: #selector(handleTap), for: .valueChanged)
setupSlideScrollView()
}
func setupSlideScrollView() {
view.addSubview(scrollView)
scrollView.isPagingEnabled = true
scrollView.translatesAutoresizingMaskIntoConstraints = false
for i in 0..<slides.count {
slides[i].frame = CGRect(x: view.frame.width * CGFloat(i), y: 0, width: view.frame.width, height: view.frame.height)
scrollView.addSubview(slides[i])
}
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let pageIndex = round(scrollView.contentOffset.x / view.frame.width)
segmentedControl.selectedSegmentIndex = Int(pageIndex)
}
#objc func handleTap(_ sender: UISegmentedControl) {
indicatorView.frame.origin.x = (segmentedControl.frame.width / CGFloat(segmentedControl.numberOfSegments)) * CGFloat(segmentedControl.selectedSegmentIndex)
UIView.animate(withDuration: 0.5, animations: {
self.view.layoutIfNeeded()
self.indicatorView.transform = CGAffineTransform(scaleX: 0.7, y: 1)
}) { (finish) in
UIView.animate(withDuration: 0.4, animations: {
self.indicatorView.transform = CGAffineTransform.identity
})
}
}
I am trying to make a game where if I press a button it can spawn another button in another area so you can click and keep doing that, every time you press the button you should get a point. I don't know how to spawn another button when I pressed one button.
// this is the code
var monkeyPosition : Int = 1
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor(white: 0.25, alpha: 1.0)
view.backgroundColor = UIColor(white: 0.25, alpha: 1.0)
view.addSubview(makeButtonSpawn())
view.addSubview(makeButtonSpawn2())
}
#IBAction func monkeyPlayer(_ sender: UIButton) {
if sender.tag == 1 && (monkeyPosition == 1) {
makeButtonSpawn2().isHidden = false
}
}
func makeButtonSpawn() -> UIButton {
let monkey = UIButton(type: UIButton.ButtonType.system)
//Set a frame for the button. Ignored in AutoLayout/ Stack Views
monkey.frame = CGRect(x: 30, y: 30, width: 90, height: 90)
monkey.backgroundColor = UIColor.blue
makeButtonSpawn().isHidden = true
return monkey
}
func makeButtonSpawn2() -> UIButton {
let monkey = UIButton(type: UIButton.ButtonType.system)
//Set a frame for the button. Ignored in AutoLayout/ Stack Views
monkey.frame = CGRect(x: 80, y: 80, width: 90, height: 90)
monkey.backgroundColor = UIColor.blue
makeButtonSpawn2().isHidden = true
return monkey
}
Create instance variables for your buttons, then you will be able to access them from places in your class. Also you can set its properties inside variable closure instead of declaring method
class ViewController: UIViewController {
var button1: UIButton = {
let button = UIButton()
button.frame = CGRect(x: 30, y: 30, width: 90, height: 90)
button.backgroundColor = .blue
return button
}()
var button2: UIButton = {
let button = UIButton()
button.frame = CGRect(x: 80, y: 80, width: 90, height: 90)
button.backgroundColor = .blue
button.isHidden = true
return button
}()
}
Next, you need to add your buttons as subviews to main view and you need to add target for them
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor(white: 0.25, alpha: 1.0)
view.backgroundColor = UIColor(white: 0.25, alpha: 1.0)
view.addSubview(button1)
view.addSubview(button2)
button1.addTarget(self, action: #selector(button1Pressed(_:)), for: .touchUpInside)
button2.addTarget(self, action: #selector(button2Pressed(_:)), for: .touchUpInside)
}
#objc func button1Pressed(_ sender: UIButton) {
}
#objc func button2Pressed(_ sender: UIButton) {
}
Finally, you can unhide second button when first button is pressed
#objc func button1Pressed(_ sender: UIButton) {
if monkeyPosition == 1 {
button2.isHidden = false
}
}
I am trying to achieve a UITableView drop down when I click on a button. Initially the tableView should be hidden, and when user presses button, it should drop down. I have been trying to achieve this with a UIStackView but to no success. Maybe I am doing it wrong or maybe there is another approach do do this.
let stackView = UIStackView()
var btn: UIButton!
var myTableView = UITableView()
override func viewDidLoad() {
super.viewDidLoad()
myTableView.delegate = self
myTableView.dataSource = self
myTableView.tableFooterView = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: 1))
myTableView.frame = CGRect(x: 0, y: 0, width: 300, height: 200)
myTableView.center = CGPoint(x: self.view.frame.width/2, y: self.view.frame.height/2)
myTableView.showsVerticalScrollIndicator = false
btn = UIButton(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: 50))
btn.backgroundColor = UIColor.blue.withAlphaComponent(0.3)
btn.setTitle("DropDownMenu", for: UIControlState.normal)
btn.titleLabel?.textColor = .white
btn.titleLabel?.textAlignment = .center
btn.center = CGPoint(x: self.view.frame.width/2, y: myTableView.center.y - myTableView.frame.height/2 - btn.frame.height/2)
btn.addTarget(self, action: #selector(btnPressed), for: UIControlEvents.touchUpInside)
stackView.axis = UILayoutConstraintAxis.vertical
stackView.distribution = UIStackViewDistribution.equalSpacing
stackView.alignment = UIStackViewAlignment.center
stackView.spacing = 16.0
stackView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(btn)
stackView.addSubview(myTableView)
self.view.addSubview(stackView)
}
#objc func btnPressed() {
UIView.animate(withDuration: 1) {
self.myTableView.isHidden = !self.myTableView.isHidden
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 4
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell()
cell.textLabel?.text = "This is cell " + indexPath.row.description
cell.textLabel?.textColor = .black
return cell
}
I can get the tableView to disappear but with no animations. Any thoughts?
The approach I ended up taking was not going via a UIStackView but insead simply having a button that animates the tableView's frame. The frame is initially set to the width of the screen and a height of 0. When user presses button, I set the height.
UIView.animate(withDuration: 0.25, animations: {
self.menuTable.frame = CGRect(x: 0, y: (sender.center.y + sender.frame.height/2), width: self.view.frame.width, height: yourHeight)
})