I am very new to programming. But i am trying to improve myself and trying to what i am thinking. Here's my question.
I have 1 textfield 1 label and 1 button.
I want that when i write into the textfield for example "aaa" and press button i should see "bbb" in the label. This is first step. Actually i want to do this with some combinations. If i write "aaa bbb" and press button label must give me "ccc" as an answer. I know this is easy for you but stuck on it. I want all codes because as i said i am very new and try to myself by trying the codes for now.
Thank you in advance.
you add this code in your project.
step one:create textfield/label/button
step two:add button action
Code:
let textField = UITextField()
let label = UILabel()
let button = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
setupUI()
}
func setupUI() -> Void {
//1.textField
textField.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
textField.placeholder = "enter.."
textField.backgroundColor = UIColor.brown
view.addSubview(textField)
//2.label
label.frame = CGRect(x: 100, y: 200, width: 100, height: 50)
label.textColor = UIColor.black
label.backgroundColor = UIColor.blue
view.addSubview(label)
//3.button
button.frame = CGRect(x: 100, y: 300, width: 100, height: 50)
button.setTitle("button", for: .normal)
button.backgroundColor = UIColor.brown
button.addTarget(self, action: #selector(buttonDidTouch), for: .touchUpInside)
view.addSubview(button)
}
func buttonDidTouch() -> Void {
label.text = "ccc"
}
You may see the screenshot. I know I expect all the codes from you but i need to get the logic in this way. Thank you again.
Related
In my app, you can increment through an array using the "next" button. Each time you hit next, the next item in the array is displayed in a label. I want another button to hide and unhide depending on which item is in the array/displayed in the label. I tried the code below, but the button is always showing no matter which item is displayed. How do I get the button to hide when the respective item is not showing?
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
#IBOutlet weak var quotesLabel: UILabel!
var firstQuote = -1
var quotes = ["The best time to plant a tree was 20 years ago - The next best time is today - Unknown",
"Everytime you spend money, you're casting a vote for the type of world you want - Anna Lappe",
"Buy less, choose well, make it last - Vivienne Westwood",
"The future depends on what we do in the present - Mahatma Gandhi",
]
#IBAction func nextButton(_ sender: Any) {
if firstQuote < quotes.count{
firstQuote = (firstQuote + 1) % quotes.count
quotesLabel.text = quotes[firstQuote]
}
let quote1 = "The best time to plant a tree was 20 years ago - The next best time is today - Unknown"
let quote = quotesLabel.text
let button1 = UIButton(type: .custom)
button1.setImage(UIImage(named: "Heart"), for: .normal)
view.addSubview(button1)
button1.frame = CGRect(x: 100, y: 200, width: 200, height: 50)
button1.isHidden = true
if quote == quote1{
button1.isHidden = false
} else {
button1.isHidden = true
}
}
}
Well, I can't say that I fully understand why this solution to my question worked, but by first putting the button into a view it solved my issue.
let view1 = UIView()
view.addSubview(view1)
view1.frame = CGRect(x: 100, y: 300, width: 200, height: 100)
view1.backgroundColor = .blue
let button1 = UIButton(type: .custom)
button1.setImage(UIImage(named: "Heart"), for: .normal)
view1.addSubview(button1)
button1.frame = CGRect(x: 0, y: 0, width: 50, height: 50)
button1.isHidden = true
I need to print value of txtField after clicking the button, txtField is on the viewcotroller but xcode returns an error cannot find 'txtField' in scope but they are in the same view
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
button.backgroundColor = .green
button.setTitle("Test Button", for: .normal)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
self.view.addSubview(button)
var txtField: UITextField = UITextField()
txtField.frame = CGRect(x: 50, y: 70, width: 200, height: 30)
txtField.backgroundColor = UIColor.gray
self.view.addSubview(txtField)
}
#objc func buttonAction(sender: UIButton!) {
print(txtField.text)
}
Actually, no, it's not in scope. Your var txtField is inside the viewDidLoad function. No other function's code can see inside this function, so the variable is not in scope from within another function such as your buttonAction.
In general the rule that things inside a scope can see only things that at a higher level of scope. If var txtField appeared outside both viewDidLoad and buttonAction (i.e. an instance property), then code inside both would be able to see it.
It's an easy move to make:
var txtField: UITextField = UITextField()
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
button.backgroundColor = .green
button.setTitle("Test Button", for: .normal)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
self.view.addSubview(button)
txtField.frame = CGRect(x: 50, y: 70, width: 200, height: 30)
txtField.backgroundColor = UIColor.gray
self.view.addSubview(txtField)
}
#objc func buttonAction(sender: UIButton!) {
print(txtField.text)
}
The error is that are in 2 different function, override or #objc doesn't change this simple thing. So move the txtField initialization outside them so can be readed or written by both.
var txtField: UITextField = UITextField()
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
button.backgroundColor = .green
button.setTitle("Test Button", for: .normal)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
self.view.addSubview(button)
txtField.frame = CGRect(x: 50, y: 70, width: 200, height: 30)
txtField.backgroundColor = UIColor.gray
self.view.addSubview(txtField)
}
#objc func buttonAction(sender: UIButton!) {
print(txtField.text)
}
In your code txtField is declared in viewDidLoad on line
var txtField: UITextField = UITextField()
Therefore out of the scope of buttonAction.
To mitigate this place
txtField
out of scope as a instance variable
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How I can create Custom view element with animation like a separate class for all view controllers, so that not write this element each time for each VC.
For example:
I am want create bottom view with button and if I am press on button animation will be appeared, and I am can do different action for different VC.
How I can create this view with animation one time for all VC and implement different action inside VC?
I can only create it each time for each VC, all work done but it's terrible code and sometimes may be hard for maintenance.
This it example how I am create my bottom menu and this way looking good but how work.
import Foundation
import UIKit
class BottomMenu: UIViewController {
static let shared = BottomMenu()
var yPosBottomUIView: CGFloat = 90.0
var yPosCenterButton: CGFloat = 35
var yPosBackButton: CGFloat = 35
var yPosForwardButton: CGFloat = 35
var yPosContextMenu: CGFloat = 35
var yPosUpdateButton: CGFloat = 35
var backButtonEnable: Bool = false
var forwardButtonEnable: Bool = false
lazy var image: UIImageView = {
let image = UIImageView(frame: CGRect(x: 0, y: UIScreen.main.bounds.maxY - yPosBottomUIView, width: UIScreen.main.bounds.width, height: 90))
if (osTheme == .dark) {
DispatchQueue.main.async {
image.image = UIImage(named: "SurfaceBlack")
}
return image
} else {
DispatchQueue.main.async {
image.image = UIImage(named: "SurfaceLight")
}
return image
}
}()
lazy var centerButton: UIButton = {
let button = UIButton(frame: CGRect(x: (UIScreen.main.bounds.maxX / 2) - 25, y: (UIScreen.main.bounds.maxY - 50) - yPosCenterButton, width: 50, height: 50))
if (osTheme == .dark) {
button.backgroundColor = UIColor(red: 0.118, green: 0.118, blue: 0.15, alpha: 1)
} else {
button.backgroundColor = UIColor(red: 0.118, green: 0.118, blue: 0.15, alpha: 1)
}
button.layer.cornerRadius = 25
button.setImage(UIImage(named: "Menu"), for: .normal)
button.addTarget(self, action: #selector(centralButtonAction), for: .touchUpInside)
button.isEnabled = false
return button
}()
lazy var backButton: UIButton = {
let button = UIButton(frame: CGRect(x: (UIScreen.main.bounds.minX) + 25, y: (UIScreen.main.bounds.maxY - 15.5) - yPosBackButton, width: 36, height: 36))
button.backgroundColor = .clear
button.setImage(UIImage(named: "whiteBackArrow"), for: .normal)
button.addTarget(self, action: #selector(centralButtonAction), for: .touchUpInside)
button.isEnabled = backButtonEnable
return button
}()
lazy var forwardButton: UIButton = {
let button = UIButton(frame: CGRect(x: (UIScreen.main.bounds.minX) + 90, y: (UIScreen.main.bounds.maxY - 15.5) - yPosForwardButton, width: 36, height: 36))
button.backgroundColor = .clear
button.setImage(UIImage(named: "whiteBackArrow"), for: .normal)
button.imageView?.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
button.addTarget(self, action: #selector(centralButtonAction), for: .touchUpInside)
button.isEnabled = forwardButtonEnable
return button
}()
lazy var contextMenu: UIButton = {
let button = UIButton(frame: CGRect(x: (UIScreen.main.bounds.maxX) - 60, y: (UIScreen.main.bounds.maxY - 15.5) - yPosContextMenu, width: 36, height: 36))
button.backgroundColor = .clear
button.setImage(UIImage(named: "ContextMenu"), for: .normal)
button.addTarget(self, action: #selector(contextMenuButtonAction), for: .touchUpInside)
return button
}()
lazy var updateButton: UIButton = {
let button = UIButton(frame: CGRect(x: (UIScreen.main.bounds.maxX) - 125, y: (UIScreen.main.bounds.maxY - 15.5) - yPosUpdateButton, width: 36, height: 36))
button.backgroundColor = .clear
button.setImage(UIImage(named: "updateN"), for: .normal)
button.addTarget(self, action: #selector(centralButtonAction), for: .touchUpInside)
button.isEnabled = false
return button
}()
lazy var blur: UIVisualEffectView = {
let blurEffectView = UIVisualEffectView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
let blurEffect = UIBlurEffect(style: .dark)
blurEffectView.effect = blurEffect
blurEffectView.alpha = 0
return blurEffectView
}()
#objc func centralButtonAction(_ sender: UIButton?) {
print("Center Tapped")
}
#objc func contextMenuButtonAction(_ sender: UIButton?) {
print("Context Menu Tapped")
// IF I am past blur effect here and some action for diffent VC nothing happens but each time I'll saw printed text above)
}
}
This is image of menu which I am create but I am write code each time for each VC
Menu have ... when I press on it I am show the same animation for all VC and add some others view BUT When I am closed others sub view I am want implement different action depend of VC where menu did be opened.
Did you tried making one controller as base controller that can be inherited by all child controller and the common actions/activites to be part of that controller. Or maybe using a container view for child controller so that you can inherit properties of your base controller to your child controller.It depends on whatever suits your actual requirements
I know how to create overlap shopping cart and quantity label with xib using uiimage like this
Now i'm trying to create overlap bar button items programatically but cannot figure out how to position the elements. My attempt:
My current code for bar button items:
let button: UIButton = UIButton(frame: CGRect(x: 0.0,
y: 0.0,
width: 24.0,
height: 24.0))
button.setImage(UIImage(named: "my cart", in: nil, compatibleWith: nil), for: .normal)
button.addTarget(self, action: #selector(cartButtonDidTapped), for: .touchUpInside)
let shoppingCartButton: UIBarButtonItem = UIBarButtonItem(customView: button)
shoppingCartQuantityLabel.layer.cornerRadius = 10
shoppingCartQuantityLabel.layer.masksToBounds = true
shoppingCartQuantityLabel.textColor = .white
shoppingCartQuantityLabel.backgroundColor = .red
shoppingCartQuantityLabel.textAlignment = .center
let shoppingCartQuantityLabelItem: UIBarButtonItem = UIBarButtonItem(customView: shoppingCartQuantityLabel)
navigationItem.rightBarButtonItems = [shoppingCartQuantityLabelItem, shoppingCartButton]
Idea here is to add the label as subview inside the button. You can adjust the label as per your needs from the below example,
let button: UIButton = UIButton(frame: CGRect(x: 0.0, y: 0.0, width: 24.0, height: 24.0))
button.setImage(#imageLiteral(resourceName: "my cart"), for: .normal)
let label = UILabel(frame: .init(origin: .init(x: 20, y: -8), size: .init(width: 20, height: 20)))
label.text = "12"
label.textAlignment = .center
label.textColor = .white
label.font = .systemFont(ofSize: 10)
label.backgroundColor = .red
label.layer.cornerRadius = 10
label.clipsToBounds = true
button.addSubview(label)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: button)
You can use this code snippet also from Github: https://gist.github.com/freedom27/c709923b163e26405f62b799437243f4#gistcomment-2236010
then set badge to your last right bar button item as below
navigationItem.rightBarButtonItems = [shoppingCartButton]
let lastBarButton = navigationItem.rightBarButtonItems?.last
lastBarButton?.setBadge(text: "10", withOffsetFromTopRight: CGPoint(x: 38, y: -3), andColor: UIColor.red, andFilled: true, andFontSize: 12)
I programmatically created an UIButton and added it to a subview. AddTarget doesnt work there though. AddTarget only works if I add the button to the mainview.
self.view.addSubview(button)
instead of
ViewSystem.addSubview(button)
Doesnt anyone know why?
Here is the fullcode:
class ViewController: UIViewController {
var ViewSystem = UIView()
#objc func TestPressed(sender: UIButton?) {Test.text=String((sender?.tag)!)
func ButtonCreate () {
let button = UIButton()
button.frame = CGRect(x: 50, y: 100, width: 70, height: 70)
button.addTarget(self, action: #selector(TestPressed), for: .touchUpInside)
button.backgroundColor = UIColor.red
button.tag=5
ViewSystem.addSubview(button)
self.view.addSubview(ViewSystem)
}
}
This happening because you are set your button frame graterthen your view that's why your button not tapped.
you are not set your view frame and then how you can you set your button inside your view.
Here I update your ButtonCreate () function code it's working nicely.
func ButtonCreate () {
ViewSystem.frame = CGRect(x: 50, y: 100, width: 200, height: 70)
ViewSystem.backgroundColor = .blue
let button = UIButton()
button.frame = CGRect(x: 0, y: 0, width: 70, height: 70)
button.addTarget(self, action: #selector(TestPressed), for: .touchUpInside)
button.backgroundColor = UIColor.red
button.tag = 5
ViewSystem.clipsToBounds = false
ViewSystem.addSubview(button)
self.view.addSubview(ViewSystem)
}
I hope it's helpfull for you and save your time
You have to give frame to your ViewSystem. and ViewSystem's height width should be greater than button's X and Y.
var ViewSystem = UIView()
ViewSystem.frame = CGRect(x: 50, y: 100, width: 70, height: 70)
#objc func TestPressed(sender: UIButton?) {Test.text=String((sender?.tag)!)
func ButtonCreate () {
let button = UIButton()
button.frame = CGRect(x: 0, y: 0, width: 70, height: 70)
button.addTarget(self, action: #selector(TestPressed), for: .touchUpInside)
button.backgroundColor = UIColor.red
button.tag=5
ViewSystem.addSubview(button)
self.view.addSubview(ViewSystem)
}
}