I've seen a bunch of examples for changing the size of a UILabel.
Here's what I'd like to do: Change the font size so that the text will be as large as possible within the new height.
Any clues?
See Question&Answers more detail:osI've seen a bunch of examples for changing the size of a UILabel.
Here's what I'd like to do: Change the font size so that the text will be as large as possible within the new height.
Any clues?
See Question&Answers more detail:osI had the very same problem and, thanks to this thread and Joel's algorithm, I could fix it. :-)
Below is my code in Swift. I'm in iOS 8 + Autolayout.
Problem:
After the fix:
Which is exactly what the designer had in mind... :)
I subclassed UILabel and overrode layoutSubviews
. Then each time the UILabel gets its size changed, the font size is recalculated:
//
// LabelWithAdaptiveTextHeight.swift
// 123
//
// Created by https://github.com/backslash-f on 12/19/14.
//
/*
Designed with single-line UILabels in mind, this subclass 'resizes' the label's text (it changes the label's font size)
everytime its size (frame) is changed. This 'fits' the text to the new height, avoiding undesired text cropping.
Kudos to this Stack Overflow thread: bit.ly/setFontSizeToFillUILabelHeight
*/
import Foundation
import UIKit
class LabelWithAdaptiveTextHeight: UILabel {
override func layoutSubviews() {
super.layoutSubviews()
font = fontToFitHeight()
}
// Returns an UIFont that fits the new label's height.
private func fontToFitHeight() -> UIFont {
var minFontSize: CGFloat = DISPLAY_FONT_MINIMUM // CGFloat 18
var maxFontSize: CGFloat = DISPLAY_FONT_BIG // CGFloat 67
var fontSizeAverage: CGFloat = 0
var textAndLabelHeightDiff: CGFloat = 0
while (minFontSize <= maxFontSize) {
fontSizeAverage = minFontSize + (maxFontSize - minFontSize) / 2
// Abort if text happens to be nil
guard text?.characters.count > 0 else {
break
}
if let labelText: NSString = text {
let labelHeight = frame.size.height
let testStringHeight = labelText.sizeWithAttributes(
[NSFontAttributeName: font.fontWithSize(fontSizeAverage)]
).height
textAndLabelHeightDiff = labelHeight - testStringHeight
if (fontSizeAverage == minFontSize || fontSizeAverage == maxFontSize) {
if (textAndLabelHeightDiff < 0) {
return font.fontWithSize(fontSizeAverage - 1)
}
return font.fontWithSize(fontSizeAverage)
}
if (textAndLabelHeightDiff < 0) {
maxFontSize = fontSizeAverage - 1
} else if (textAndLabelHeightDiff > 0) {
minFontSize = fontSizeAverage + 1
} else {
return font.fontWithSize(fontSizeAverage)
}
}
}
return font.fontWithSize(fontSizeAverage)
}
}