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So I am currently creating dynamic labels, and I need to get their value when tapped. I am creating labels number 1 through 10 with a for loop. I then add them to the view along with UITapGestureRecognizer to detect when tapped. What I need to do is get the text of the tapped label. So if I clicked the label with the text of 1, I'd expect to have the 1 returned. Here's what I'm doing to create the label and adding the gesture recognizer.
for number in numbers.characters {
let touch = UITapGestureRecognizer(target:self, action: "numberClicked")
touch.numberOfTapsRequired = 1
let label = UILabel(frame: CGRectMake(CGFloat(x), CGFloat(y1), CGFloat(width), CGFloat(height)))
label.font = label.font.fontWithSize(38)
label.text = String(number)
label.userInteractionEnabled = true
label.addGestureRecognizer(touch)
self.view.addSubview(label)
}
Here's an example of getting the text of the label in your action function. The key change is to add a colon to the name of the tap action, indicating it takes a sender argument. Then you can access the view property of the sender to get at the UILabel itself.
for number in numbers.characters {
// add a colon after "numberClicked" to indicate it takes an argument
let touch = UITapGestureRecognizer(target:self, action: "numberClicked:")
touch.numberOfTapsRequired = 1
let label = UILabel(frame: CGRectMake(CGFloat(x), CGFloat(y1), CGFloat(width), CGFloat(height)))
label.font = label.font.fontWithSize(38)
label.text = String(number)
label.userInteractionEnabled = true
label.addGestureRecognizer(touch)
self.view.addSubview(label)
}
func numberClicked(gesture: UIGestureRecognizer) {
if gesture.state == .Ended {
if let theLabel = (gesture.view as? UILabel)?.text {
print(theLabel) // print the "1"
}
}
}
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I have used DLRadioButton library. I need to add multiple buttons in vertical stack view using an array of string and load into stack view.
override func viewDidLoad() {
super.viewDidLoad()
for item in 0...3{
AccountStackView(at: item).setTitle("\(account[item])", for: .normal)
}
}
func AccountStackView(at index:Int) -> DLRadioButton {
return StackView.arrangedSubviews[index] as! DLRadioButton
}
Add in your UIViewController
override func viewDidLoad() {
super.viewDidLoad()
let array = [dLRadioButton0, dLRadioButton1, dLRadioButton2, dLRadioButton3] // change it if you already have an array of DLRadioButton buttons
for item in array {
item.setTitle("Your Text", for: .normal)
}
let yourStackView = addToStackViewButtons(array: array, andAddTo: self.view)
for item in yourStackView.arrangedSubviews as! [DLRadioButton] {
// do something with your DLRadioButton's
item.backgroundColor = .green
}
}
func addToStackViewButtons(array : [DLRadioButton], andAddTo yourView : UIView) -> UIStackView {
let sv = UIStackView(arrangedSubviews: array) // or just get link from storyboard via outlet link
sv.distribution = .fillEqually
sv.axis = .vertical
sv.frame = yourView.frame
yourView.addSubview(sv) // if you create stackview sv programmically
// set frame of add your constraints if you need
// for example:
sv.leftAnchor.constraint(equalTo: yourView.leftAnchor)
sv.topAnchor.constraint(equalTo: yourView.topAnchor)
sv.bottomAnchor.constraint(equalTo: yourView.bottomAnchor)
sv.rightAnchor.constraint(equalTo: yourView.rightAnchor)
return sv
}
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In Obj C I created a property
#property(nonatomic) UILabel *subscriptionText;
Then I created a setter method for that property UILabel. like below
-(UILabel *)subscriptionText{
if (!_subscriptionText) {
_subscriptionText = [UILabel new];
_subscriptionText.translatesAutoresizingMaskIntoConstraints = NO;
_subscriptionText.textAlignment = NSTextAlignmentJustified;
}
return _subscriptionText;
}
then In viewdidload I add this view by
[self.view addSubview:self.subscriptionText];
How can I do this same scenario in Swift 4.2.
A lazy initialization is what you need.
lazy var subscriptionText: UILabel = {
let label = UILabel()
label.textAlignment = .justified
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
func viewDidLoad() {
super.viewDidLoad()
view.addSubview(subscriptionLabel)
// Label constraints
}
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I have an anatomic picture and on it, I want to print a image like a dot or something when the user taps on the first image (the body) to point out where does it hurts.
I've already read something on UITapGestureRecognizer, but I don't really understood how it works.
Try this:
override func viewDidLoad() {
super.viewDidLoad()
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ViewController.handleTap))
self.imageView.addGestureRecognizer(gestureRecognizer)
}
#objc func handleTap(tap: UITapGestureRecognizer) {
let circle = UIView()
circle.center = tap.locationInView(imageView)
circle.frame.size = CGSize(width: 30, height: 30)
circle.layer.backgroundColor = UIColor.redColor().CGColor
circle.layer.cornerRadius = 15
imageView.addSubview(circle)
}
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How to change the color by pressing typing in TextView?
For example, I type in black, and then press the button of color orange and more print text in orange color, then I press on the black button and print black text?
The studied methods can have the color of all typed text or placeholders etc.
Try this way:
#IBAction func blackButtonClicked(sender: UIButton) {
let attributedText = textView.attributedText
textView.textColor = UIColor.blackColor()
textView.attributedText = attributedText
}
#IBAction func redButtonClicked(sender: UIButton) {
let attributedText = textView.attributedText
textView.textColor = UIColor.redColor()
textView.attributedText = attributedText
}
You can also achieve this by setting the typingAttributes property of the textView, which seems to be a nicer solution:
#IBAction func redButtonClicked() {
textView.typingAttributes[NSForegroundColorAttributeName] = UIColor.redColor()
}
#IBAction func blackButtonClicked() {
textView.typingAttributes[NSForegroundColorAttributeName] = UIColor.blackColor()
}
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I need to perform an effect like this in my app:
How can I do this? I need to animate single letters in the text and not the entire label. I'm using Swift.
EDIT (more details):
I need to animate the letters from right to left using a sort of spring damping (like UIView animation), but I don't know how to achieve this. The most important part of this animation is the first one, where the letters enter from left to right with a variable space between the first ones and the others
A while back I asked a similar question and got this reply from
https://stackoverflow.com/users/4754400/chris-gulley
A very clever piece of code indeed.
class Timer {
typealias TimerFunction = (Int)->Bool
private var handler: TimerFunction
private var i = 0
init(interval: NSTimeInterval, handler: TimerFunction) {
self.handler = handler
NSTimer.scheduledTimerWithTimeInterval(interval, target: self, selector: "timerFired:", userInfo: nil, repeats: true)
}
#objc
private func timerFired(timer:NSTimer) {
if !handler(i++) {
timer.invalidate()
}
}
}
class ViewController: UIViewController {
let text: NSAttributedString = {
let font = UIFont(name: "Georgia", size: 18.0) ?? UIFont.systemFontOfSize(18.0)
return NSAttributedString(string: "A long time ago, in a galaxy far, far away ...", attributes: [NSFontAttributeName: font])
}()
override func viewDidLoad() {
super.viewDidLoad()
let textView = UITextView(frame: CGRect(x: 100, y: 120, width: CGRectGetWidth(self.view.frame), height: CGRectGetWidth(self.view.frame)-20))
self.view.addSubview(textView)
let _ = Timer(interval: 0.1) {i -> Bool in
textView.attributedText = self.text.attributedSubstringFromRange(NSRange(location: 0, length: i+1))
return i + 1 < self.text.string.characters.count
}
}
}
Displaying text one character at a time in swift 2.0