问题
I have tried everything to auto-resize my UILabel in Swift. I can autoresize the text when it is one line but when it is two lines it no longer works. The text in the UILabel changes often happening about every 10 seconds. The code I have tried is:
let direction = UILabel(frame: CGRect(x: 95, y: 10, width: screenWidth - 95, height:100))
direction.numberOfLines = 0
direction.adjustsFontSizeToFitWidth = true
direction.lineBreakMode = .byWordWrapping
direction.textAlignment = .center
direction.minimumScaleFactor = 0.2
direction.font = UIFont.boldSystemFont(ofSize: 40)
view.addSubview(direction)
direction.text = "Ffafdafafdfa fafda dfafaf afa"
func updateDirection(update: String){
direction.text = update
}
The original text "Ffafdafafdfa fafda dfafaf afa" will automatically resize but when updateDirection is called the font size with not be changed from 40. I have also tried setting the number of lines to 2 and removing the .byWordWrapping. How can I get my UILabel to resize automatically?
回答1:
Below code will keep the frame size
and adjust the font size
according with direction label content
.
let backgroundView = UIView(frame: CGRect(x: 5, y: UINavigationController().navigationBar.frame.height + UIApplication.shared.statusBarFrame.height, width: UIScreen.main.bounds.width - 10, height: UIScreen.main.bounds.width - 100))
let direction = UILabel()
override func viewDidLoad() {
super.viewDidLoad()
direction.backgroundColor = UIColor.green
direction.numberOfLines = 0
direction.textAlignment = .center
direction.font = UIFont.boldSystemFont(ofSize: 40)
direction.adjustsFontForContentSizeCategory = true
direction.adjustsFontSizeToFitWidth = true
direction.text = "This is some multiline label with a background colour" // Set or Initiate random function for your array here.
backgroundView.backgroundColor = UIColor.red
view.addSubview(backgroundView)
backgroundView.addSubview(direction)
Timer.scheduledTimer(timeInterval: 10.0, target: self, selector: #selector(random), userInfo: nil, repeats: true)
direction.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint(item: direction,
attribute: .leading,
relatedBy: .equal,
toItem: backgroundView,
attribute: .leadingMargin,
multiplier: 1.0,
constant: 0.0).isActive = true
NSLayoutConstraint(item: direction,
attribute: .trailing,
relatedBy: .equal,
toItem: backgroundView,
attribute: .trailingMargin,
multiplier: 1.0,
constant: 0.0).isActive = true
NSLayoutConstraint(item: direction,
attribute: .top,
relatedBy: .equal,
toItem: backgroundView,
attribute: .topMargin,
multiplier: 1.0,
constant: 0.0).isActive = true
NSLayoutConstraint(item: direction,
attribute: .bottom,
relatedBy: .equal,
toItem: backgroundView,
attribute: .bottomMargin,
multiplier: 1.0,
constant: 0.0).isActive = true
}
func random(sender: Timer) {
//Place your random func code here.
}
Output:
回答2:
Try this without Constraints:
let direction = UILabel(frame: CGRect(x: 95, y: 10, width: 375 - 95, height:100))
direction.numberOfLines = 0
direction.adjustsFontSizeToFitWidth = true
direction.textAlignment = .center
direction.minimumScaleFactor = 0.2
direction.font = UIFont.boldSystemFont(ofSize: 40)
view.addSubview(direction)
direction.text = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard"
回答3:
I will try this code It is use full
first create one function
func calchight(strin:String) -> CGFloat
{
let label = UILabel(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: CGFloat.greatestFiniteMagnitude))
label.numberOfLines = 0
label.text = strin
label.sizeToFit()
return label.frame.height + 2
}
then call this function in your right place, when you want to resize label
/--------------
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{
let heit = self.calchight(strin: StringObject)
return (heit)
}
/--------------------------
this code is useful and not require Auto layout containers
回答4:
Try using function sizetofit() after assigning text to your label. like:
direction.sizeToFit()
来源:https://stackoverflow.com/questions/44038022/autoresize-multiline-uilabel-in-swift