I am trying to add a label to the UIView. I am seeing the view, but I am not seeing the label. What am I missing?
var StLabel: UILabel = {
let label = UILabel()
label.font = UIFont(name: "Arial-Regular", size: 20)
label.textColor = UIColor.black
label.sizeToFit()
return label
}()
init(frame: CGRect, text: String) {
super.init(frame: frame)
self.frame = CGRect(x: 0, y: 0, width: 300, height: 50)
self.layer.cornerRadius = 10
self.layer.masksToBounds = true
self.backgroundColor = UIColor.white
StLabel.text = text
self.addSubview(StLabel)
}
You are calling sizeToFit() on the label before its text is set so the label's frame ends up with a 0 size.
Add a call to StLabel.sizeToFit() after the line StLabel.text = text.
Related
I am creating a custom search bar by subclassing the UITextField. For some reason, the search bar has a very subtle, weird white line/border around the edges. The issue only exists on my iPhone 13 Pro Max - on the simulator everything works perfectly fine.
notice the slight white border around the pill shaped search text field. Almost like it has a white background color.
I tried to battle this by setting layer.masksToBounds and clipsToBounds to true, but unfortunately that doesn't work either.
This is my code:
public class MyCustomSearchBar: UITextField {
public override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = Theme.GRAY800
self.borderStyle = .roundedRect
self.layer.masksToBounds = true
self.clipsToBounds = true
self.autocorrectionType = .no
self.textColor = .white
self.attributedPlaceholder = NSAttributedString(string: "Search", attributes: [.foregroundColor : Theme.GRAY400, .font: FontFamily.ProximaNova.regular.font(size: 16)])
}
}
UPDATE:
If I add a border width and color, everything looks normal again:
Question:
Why is this a problem on my iPhone but not in the simulator? Why do I manually have to set the border width and color to avoid those white "fragments"?
create border and corner manually, this is an example:
let myTextField = MyCustomSearchBar()
in viewDidLoad set constraints
view.addSubview(myTextField)
myTextField.heightAnchor.constraint(equalToConstant: 50).isActive = true
myTextField.widthAnchor.constraint(equalToConstant: view.frame.width - 40).isActive = true
myTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
myTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
now assign border width, border color e round corner in MyCustomSearchBar class
public class MyCustomSearchBar: UITextField {
public override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = .yourColor
self.borderStyle = .none
self.layer.masksToBounds = true
self.layer.cornerRadius = 16
self.clipsToBounds = true
self.layer.borderWidth = 2
self.layer.borderColor = UIColor.white.cgColor
self.autocorrectionType = .no
self.textColor = .white
self.attributedPlaceholder = NSAttributedString(string: "Search", attributes: [.foregroundColor : UIColor.lightGray, .font: UIFont.systemFont(ofSize: 16, weight: .regular)])
self.addPadding(padding: .left(20)) // this is a extra
self.translatesAutoresizingMaskIntoConstraints = false
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
to add padding spacing to your textField use my extension:
extension UITextField {
enum PaddingSpace {
case left(CGFloat)
case right(CGFloat)
case equalSpacing(CGFloat)
}
func addPadding(padding: PaddingSpace) {
self.leftViewMode = .always
self.layer.masksToBounds = true
switch padding {
case .left(let spacing):
let leftPaddingView = UIView(frame: CGRect(x: 0, y: 0, width: spacing, height: self.frame.height))
self.leftView = leftPaddingView
self.leftViewMode = .always
case .right(let spacing):
let rightPaddingView = UIView(frame: CGRect(x: 0, y: 0, width: spacing, height: self.frame.height))
self.rightView = rightPaddingView
self.rightViewMode = .always
case .equalSpacing(let spacing):
let equalPaddingView = UIView(frame: CGRect(x: 0, y: 0, width: spacing, height: self.frame.height))
// left
self.leftView = equalPaddingView
self.leftViewMode = .always
// right
self.rightView = equalPaddingView
self.rightViewMode = .always
}
}
}
This is the result:
My UITextView does not display its text and I have no idea why.
let linkLabel: UITextView = {
let v = UITextView()
v.backgroundColor = .clear
v.text = "Link"
v.textColor = .lightGray
v.font = UIFont(name: "AvenirNext", size: 18)
v.font = v.font?.withSize(18)
v.textAlignment = .right
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
It was a UILabel before and working perfectly fine. But I need it to be a UITextView. However if I change it to UITextView like in the code the text is not getting displayed.
Any idea why that happens?
Your UITextView frame is equal to CGRect.zero and unlike a UILabel, a UITextView does not have an intrinsic frame. That's why you don't see it.
Solution
Use init(frame: CGRect)
UITextView(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
Set a frame property later
let v = UITextView()
v.frame = CGRect(x: 0, y: 0, width: 100, height: 30)
Important:
The linkLabel have to be added to the view via InterfaceBuilder or in code with a method view.addSubview of the UIView object
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(linkLabel)
}
Debug techniques:
Debug View Hierarchy
Click the Debug View Hierarchy button in the bar at the top of the debug area to inspect a 3D rendering of the view hierarchy of your paused app
You can use sizeToFit() and isScrollEnabled to false like below:
let linkLabel: UITextView = {
let v = UITextView()
v.backgroundColor = .red
v.text = "Link"
v.textColor = .lightGray
v.font = UIFont(name: "AvenirNext", size: 18)
v.font = v.font?.withSize(18)
v.textAlignment = .right
v.sizeToFit()
v.isScrollEnabled = false
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
// And set the frame whereever you want
linkLabel.frame.origin = CGPoint(x: 100, y: 100)
self.view.addSubview(linkLabel)
I am running into a basic problem with views on iPad. I have a viewController. The view is using a UIImageView with a full screen image as a background image. I am trying to overlay labels on the top. If I set labels individually, both views show up. If I call a function with the same information only one view shows up. I need to extend it many labels. Here is the code:
class ViewController: UIViewController {
#IBOutlet weak var backGroundImageView: UIImageView!
var cFrame:[CGRect?] = [CGRect?](repeating: nil, count: 13)
var offsets:[CGRect?] = [CGRect?](repeating: nil, count: 13)
var labels: [UILabel?] = [UILabel?](repeating:UILabel(), count:13)
override func viewDidLoad() {
super.viewDidLoad()
cFrame[0] = CGRect(x:450,y:530,width:251,height:68)
cFrame[1] = CGRect(x:147,y:676,width:222,height:24)
loadFrameValues()
var frame = CGRect(x: 450, y: 520, width: 251, height: 68)
let label0 = UILabel(frame: frame)
label0.backgroundColor = .white
label0.numberOfLines = 0
label0.lineBreakMode = .byWordWrapping
label0.textAlignment = .center
label0.text = "Text 1"
frame = CGRect(x: 152, y: 686, width: 210, height: 16)
let label1 = UILabel(frame: frame)
label1.backgroundColor = .cyan
label1.lineBreakMode = .byWordWrapping
label1.textAlignment = .left
label1.text = "Text 2"
label1.font = label1.font.withSize(12)
backGroundImageView.addSubview(label0)
backGroundImageView.addSubview(label1)
// showView(label: labels[0]!, frame: cFrame[0]!)
// showView(label: labels[1]!, frame: cFrame[1]!)
// }
}
func showView(label: UILabel, frame:CGRect) {
label.frame = frame
label.backgroundColor = .white
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.textAlignment = .center
label.text = "Syed Tariq"
backGroundImageView.addSubview(label)
}
You can't add subview (label in your case) to UIImageView. So add label as subview to the superview of your image view.
override func viewDidLoad() {
cFrame[0] = CGRect(x:50,y:130,width:151,height:68)
cFrame[1] = CGRect(x:114,y:276,width:122,height:24)
showView(frame: cFrame[0]!)
showView(frame: cFrame[1]!)
}
func showView(frame:CGRect) {
let label = UILabel(frame: frame)
label.backgroundColor = .green
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.textAlignment = .center
label.text = "Syed Tariq"
self.view.addSubview(label)
}
I have the following view which contains a UILabel:
class MyView : UIView {
func viewDidLoad() {
self.autoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth
bottomView = UIView(frame: CGRectMake(self.bounds.origin.x, self.bounds.origin.y + self.imageView!.bounds.size.width, self.bounds.size.width, self.bounds.size.height - self.imageView!.bounds.size.height))
// bottomView frame calculation is: (0.0, 355.0, 355.0, 130.0)
bottomView?.backgroundColor = UIColor.greenColor()
bottomView?.autoresizingMask = UIViewAutoresizing.FlexibleWidth
bottomView?.clipsToBounds = true
self.addSubview(self.bottomView!)
var descriptionRect: CGRect = CGRectInset(self.bottomView!.bounds, leftRightInset, 20/2)
let descriptionLabel = UILabel()
descriptionLabel.numberOfLines = 3
descriptionLabel.autoresizingMask = UIViewAutoresizing.FlexibleWidth
descriptionLabel.font = UIFont(name: MGFont.helvetica, size: 22)
descriptionLabel.textColor = UIColor.whiteColor()
descriptionLabel.textAlignment = NSTextAlignment.Left
descriptionLabel.backgroundColor = UIColor.blueColor()
var paragraphStyle:NSMutableParagraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineBreakMode = NSLineBreakMode.ByTruncatingTail
let attributes = [NSParagraphStyleAttributeName : paragraphStyle]
descriptionLabel.attributedText = NSAttributedString(string: previewCard.title, attributes:attributes)
bottomView?.addSubview(descriptionLabel)
descriptionLabel.bounds = descriptionRect
descriptionLabel.sizeToFit()
descriptionLabel.center = CGPointMake(bottomView!.bounds.width/2, bottomView!.bounds.height/2 - hotelNameLableHeight/2)
}
}
The height of the bottomView should always be fixed.
MyView is resized during runtime. This means that the green bottom view also increases in size.
Here is the result when the label has two and three lines:
It appears that the UILabel resizes its super view.
Note that I do not use AutoLayout.
override func layoutSubviews() {
super.layoutSubviews()
}
How can I prevent the UILabel from resizing its SuperView?
Edit: I also tried to comment bottomView?.clipsToBounds = true
Override setFrame: and setBounds: of the super view (subclass if they're plain UIViews), add breakpoints, and see the stack trace to find out what's causing them to resize.
There is no need to set the autoResizingMask on the label, just set the frame and it will get automatically centered. And of course you can set the insets for the UILabel accordingly. I've add below testing code FYI:
override func viewDidLayoutSubviews() {
addTestView(CGRectMake(0, 200, view.bounds.width, 50), labelStr: "I am a short testing label")
addTestView(CGRectMake(0, 260, view.bounds.width, 50), labelStr: "I am a very longlonglonglonglonglonglong testing label")
addTestView(CGRectMake(0, 320, view.bounds.width, 50), labelStr: "I am a very longlonglonglonglonglonglonglonglonglonglonglong testing label. Will be truncated")
}
func addTestView(frame:CGRect, labelStr: String){
let bottomView = UIView(frame:frame)
bottomView.backgroundColor = UIColor.greenColor()
bottomView.autoresizingMask = UIViewAutoresizing.FlexibleWidth
bottomView.clipsToBounds = true
view.addSubview(bottomView)
var label = UILabel(frame: bottomView.bounds)
label.textAlignment = NSTextAlignment.Left
label.numberOfLines = 0
label.text = labelStr
bottomView.addSubview(label)
}
How do I create a UILabel programmatically using Swift in Xcode 6?
I have started with a new "Single View Application" in Xcode 6 and selected Swift for this project. I have my files AppDelegate.swift and ViewController.swift and I'm not sure what to do from here.
Creating a UILabel programmatically in Swift 3+:
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
label.text = "I'm a test label"
self.view.addSubview(label)
}
Here is the correct code for Swift 3, with comments for instructional purposes:
override func viewDidLoad()
{
super.viewDidLoad()
// CGRectMake has been deprecated - and should be let, not var
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
// you will probably want to set the font (remember to use Dynamic Type!)
label.font = UIFont.preferredFont(forTextStyle: .footnote)
// and set the text color too - remember good contrast
label.textColor = .black
// may not be necessary (e.g., if the width & height match the superview)
// if you do need to center, CGPointMake has been deprecated, so use this
label.center = CGPoint(x: 160, y: 284)
// this changed in Swift 3 (much better, no?)
label.textAlignment = .center
label.text = "I am a test label"
self.view.addSubview(label)
}
Just to add onto the already great answers, you might want to add multiple labels in your project so doing all of this (setting size, style etc) will be a pain. To solve this, you can create a separate UILabel class.
import UIKit
class MyLabel: UILabel {
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initializeLabel()
}
override init(frame: CGRect) {
super.init(frame: frame)
initializeLabel()
}
func initializeLabel() {
self.textAlignment = .left
self.font = UIFont(name: "Halvetica", size: 17)
self.textColor = UIColor.white
}
}
To use it, do the following
import UIKit
class ViewController: UIViewController {
var myLabel: MyLabel()
override func viewDidLoad() {
super.viewDidLoad()
myLabel = MyLabel(frame: CGRect(x: self.view.frame.size.width / 2, y: self.view.frame.size.height / 2, width: 100, height: 20))
self.view.addSubView(myLabel)
}
}
Swift 4.X and Xcode 10
let lbl = UILabel(frame: CGRect(x: 10, y: 50, width: 230, height: 21))
lbl.textAlignment = .center //For center alignment
lbl.text = "This is my label fdsjhfg sjdg dfgdfgdfjgdjfhg jdfjgdfgdf end..."
lbl.textColor = .white
lbl.backgroundColor = .lightGray//If required
lbl.font = UIFont.systemFont(ofSize: 17)
//To display multiple lines in label
lbl.numberOfLines = 0 //If you want to display only 2 lines replace 0(Zero) with 2.
lbl.lineBreakMode = .byWordWrapping //Word Wrap
// OR
lbl.lineBreakMode = .byCharWrapping //Charactor Wrap
lbl.sizeToFit()//If required
yourView.addSubview(lbl)
If you have multiple labels in your class use extension to add properties.
//Label 1
let lbl1 = UILabel(frame: CGRect(x: 10, y: 50, width: 230, height: 21))
lbl1.text = "This is my label fdsjhfg sjdg dfgdfgdfjgdjfhg jdfjgdfgdf end..."
lbl1.myLabel()//Call this function from extension to all your labels
view.addSubview(lbl1)
//Label 2
let lbl2 = UILabel(frame: CGRect(x: 10, y: 150, width: 230, height: 21))
lbl2.text = "This is my label fdsjhfg sjdg dfgdfgdfjgdjfhg jdfjgdfgdf end..."
lbl2.myLabel()//Call this function from extension to all your labels
view.addSubview(lbl2)
extension UILabel {
func myLabel() {
textAlignment = .center
textColor = .white
backgroundColor = .lightGray
font = UIFont.systemFont(ofSize: 17)
numberOfLines = 0
lineBreakMode = .byCharWrapping
sizeToFit()
}
}
Create UILabel view outside viewDidLoad class and then add that view to your main view in viewDidLoad method.
lazy var myLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "This is label view."
label.font = UIFont.systemFont(ofSize: 12)
return label
}()
And then add that view in viewDidLoad()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(myLabel)
// Set its constraint to display it on screen
myLabel.widthAnchor.constraint(equalToConstant: 200).isActive = true
myLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
myLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
You can create a label using the code below. Updated.
let yourLabel: UILabel = UILabel()
yourLabel.frame = CGRect(x: 50, y: 150, width: 200, height: 21)
yourLabel.backgroundColor = UIColor.orange
yourLabel.textColor = UIColor.black
yourLabel.textAlignment = NSTextAlignment.center
yourLabel.text = "test label"
self.view.addSubview(yourLabel)
Another answer in Swift 3:
let myLabel = UILabel()
myLabel.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
myLabel.center = CGPoint(x: 0, y: 0)
myLabel.textAlignment = .center
myLabel.text = "myLabel!!!!!"
self.view.addSubview(myLabel)
Create label in swift 4
let label = UILabel(frame: CGRect(x: self.view.frame.origin.x, y: self.view.frame.origin.y, width: self.view.frame.size.width, height: 50))
label.textAlignment = .center
label.text = "Hello this my label"
//To set the color
label.backgroundColor = UIColor.white
label.textColor = UIColor.black
//To set the font Dynamic
label.font = UIFont(name: "Helvetica-Regular", size: 20.0)
//To set the system font
label.font = UIFont.systemFont(ofSize: 20.0)
//To display multiple lines
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping //Wrap the word of label
label.lineBreakMode = .byCharWrapping //Wrap the charactor of label
label.sizeToFit()
self.view.addSubview(label)
An alternative using a closure to separate out the code into something a bit neater using Swift 4:
class theViewController: UIViewController {
/** Create the UILabel */
var theLabel: UILabel = {
let label = UILabel()
label.lineBreakMode = .byWordWrapping
label.textColor = UIColor.white
label.textAlignment = .left
label.numberOfLines = 3
label.font = UIFont(name: "Helvetica-Bold", size: 22)
return label
}()
override func viewDidLoad() {
/** Add theLabel to the ViewControllers view */
view.addSubview(theLabel)
}
override func viewDidLayoutSubviews() {
/* Set the frame when the layout is changed */
theLabel.frame = CGRect(x: 0,
y: 0,
width: view.frame.width - 30,
height: 24)
}
}
As a note, attributes for theLabel can still be changed whenever using functions in the VC. You're just setting various defaults inside the closure and minimizing clutter in functions like viewDidLoad()
Swift 4.2 and Xcode 10. Somewhere in ViewController:
private lazy var debugInfoLabel: UILabel = {
let label = UILabel()
label.textColor = .white
label.translatesAutoresizingMaskIntoConstraints = false
yourView.addSubview(label)
NSLayoutConstraint.activate([
label.centerXAnchor.constraint(equalTo: suggestionView.centerXAnchor),
label.centerYAnchor.constraint(equalTo: suggestionView.centerYAnchor, constant: -100),
label.widthAnchor.constraint(equalToConstant: 120),
label.heightAnchor.constraint(equalToConstant: 50)])
return label
}()
...
Using:
debugInfoLabel.text = debugInfo
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
label.text = "My label"
self.view.addSubview(label)
Try above code in ViewDidLoad
Swift 4.2 and Xcode 10
Initialize label before viewDidLoad.
lazy var topLeftLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "TopLeft"
return label
}()
In viewDidLoad add label to the view and apply constraints.
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(topLeftLabel)
topLeftLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 10).isActive = true
topLeftLabel.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 10).isActive = true
}