iOS 7's UIFontDescriptor is pretty neat. Also pretty neat is dynamic text that responds to the preferred text size that the user specified in Settings.app.
What's not so neat, though, is that +[UIFont preferredFontForTextStyle:] only works with the system font, Helvetica Neue (iOS 8) or San Francisco (iOS 9). What if you have custom fonts and want to respect the user's text size preference?
SSDynamicText is a collection of simple UILabel, UIButton, UITextField, and UITextView subclasses inspired by this SO answer.
iOS 10 added to UILabel, UITextField and UITextView built-in dynamic font size support via adjustsFontForContentSizeCategory, so there's no need to manually update font after content size category change. Sadly accessibility content size categories work only for .body style.
But finally in iOS 11 Apple introduced UIFontMetrics which allows to use custom fonts with all content size categories support.
It's supported by UILabel (so UIButton as well), UITextField and UITextView. Works for plain text and NSAttributedString.
// Plain text
UIFont *font = [UIFont fontWithName:@"Courier" size:28.0f];
label.font = [UIFontMetrics.defaultMetrics scaledFontForFont:font];
label.adjustsFontForContentSizeCategory = YES;
label.text = @"Plan text";
// Attributed text
UIFont *biggerFont = [UIFont fontWithName:@"Courier" size:28.0f];
UIFont *scaledBiggerFont = [[UIFontMetrics metricsForTextStyle:UIFontTextStyleTitle1] scaledFontForFont:biggerFont];
UIFont *smallerFont = [UIFont fontWithName:@"Courier" size:13.0f];
UIFont *scaledSmallerFont = [[UIFontMetrics metricsForTextStyle: UIFontTextStyleFootnote] scaledFontForFont:smallerFont];
NSAttributedString *biggerAttributedText = [[NSAttributedString alloc] initWithString:@"Bigger text"
attributes:@{ NSAccessibilityFontTextAttribute : scaledBiggerFont }];
NSAttributedString *smallerAttributedText = [[NSAttributedString alloc initWithString:@"smaller text"
attributes:@{ NSAccessibilityFontTextAttribute : scaledSmallerFont }];
NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] init];
[attributedText appendAttributedString:biggerAttributedText];
[attributedText appendAttributedString:smallerAttributedText];
label.adjustsFontForContentSizeCategory = YES;
label.attributedText = attributedText;// Plain text
let font = UIFont(name: "Courier", size: 17.0)!
label.font = UIFontMetrics.default.scaledFont(for: font)
label.adjustsFontForContentSizeCategory = true
label.text = "Plan text"
// Attributed text
let biggerFont = UIFont(name: "Courier", size: 28.0)!
let scaledBiggerFont = UIFontMetrics(forTextStyle: .title1).scaledFont(for: biggerFont)
let smallerFont = UIFont(name: "Courier", size: 13.0)!
let scaledSmallerFont = UIFontMetrics(forTextStyle: .footnote).scaledFont(for: smallerFont)
let biggerAttributedText = NSAttributedString(string: "Bigger text",
attributes: [.font: scaledBiggerFont])
let smallerAttributedText = NSAttributedString(string: "smaller text",
attributes: [.font: scaledSmallerFont])
let attributedText = NSMutableAttributedString()
attributedText.append(biggerAttributedText)
attributedText.append(smallerAttributedText)
label.adjustsFontForContentSizeCategory = true
label.attributedText = attributedTextXcode 7.0+ with iOS 7.0+ SDK.
Add to your Podfile:
pod 'SSDynamicText', '~> 1.0.0'Add to your Cartfile:
github "splinesoft/SSDynamicText", ~> 1.1.0SSDynamicText provides dynamic auto-sizing labels, buttons, text fields, and text views that respond when the user changes her preferred text size. Check out a full example.
UIKit views that responds when the user changes her preferred text size:
SSDynamicLabel *myLabel = [SSDynamicLabel labelWithFont:@"Courier"
baseSize:16.0f];
myLabel.text = @"Auto-sizing text!";
// Already have a font descriptor?
UIFontDescriptor *aDescriptor = [UIFontDescriptor fontDescriptorWithName:@"Courier"
size:16.0f];
SSDynamicLabel *otherLabel = [SSDynamicLabel labelWithFontDescriptor:aDescriptor];SSDynamicButton *myButton = [SSDynamicButton buttonWithFont:@"Courier"
baseSize:16.0f];
[myButton setText:@"Auto-sizing text!" forControlState:UIControlStateNormal];SSDynamicTextField *myTextField = [SSDynamicTextField textFieldWithFont:@"Courier"
baseSize:16.0f];
myTextField.text = @"Auto-sizing text!";SSDynamicTextView *myTextView = [SSDynamicTextView textViewWithFont:@"Courier"
baseSize:16.0f];
myTextView.text = @"Auto-sizing text!";Create a UIFont object using the specified font name and base size.
The actual size of the returned font is adjusted by the user's current preferred font size (specified in Settings.app).
UIFont *myFont = [UIFont dynamicFontWithName:@"Courier" baseSize:16.0f];This property returns a numeric delta between the default size setting (Large) and the user's current preferred text size.
You probably don't need to use this directly.
NSInteger textDelta = [[UIApplication sharedApplication] preferredFontSizeDelta];SSDynamicText supports attributed text! Assign your NSAttributedString to the new dynamicAttributedText property.
UITextView and UITextField sometimes internally call -setAttributedText: even with normal text. To best accommodate that internal implementation detail, we've added a new dynamicAttribtuedText property instead of overriding -setAttributedText:.
@property (nonatomic, copy) NSAttributedString *dynamicAttributedText;SSDynamicText is a @jhersh production -- (electronic mail | @jhersh)