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SwiftUI AttributedString on Watch
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Gerriet M. Denkmann
I have a Watch-App using SwiftUI.
let fontSize = 40.0 struct WatchContentView: View { @State var timeAttributedStr = AttributedString("--") let timer = Timer.publish(every: 1, tolerance: 0.1, on: .main, in: .common).autoconnect() var body: some View { VStack { Text(timeAttributedStr) } .onReceive(timer) { currentTime in timeAttributedStr = … make from currentTime using fontSize … // compare size of timeAttributedStr to window and decrease fontSize if needed // no idea how to do this } } } The Problem: I want to make fontSize as big as possible. And then do: if timeAttributedStr.size.width > window.size.width then decrease fontSize But sadly, AttributedString has no size. A fixed fontSize is less than ideal, because the optimal timeAttributedStr will depend both on Locale and Watch model. Gerriet. |
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Laurent Daudelin
Doesn’t AttributedString uses a dictionary to set its attributes, including font and font size?
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Alex Zavatone
Would you use a sizeToFit or sizeThatFits method call to do that for you even after you’ve set the attributed text? Here’s a chunk of it. You can see how I apply the font size to the dictionary. Cheers! // Set base font & size. CGFloat fontSize = 20.0; UIFont *fnt = [UIFont fontWithName:@"Helvetica" size:fontSize]; // never initialize a font with a size of 0.0, or it will always be Helvetica // Define base string. NSString *myString; //myString = @"beauty club®"; // with R myString = @"beauty club™"; // with TM // Define base color and font definitions. fontSize = 24; UIColor *myBlue = [UIColor colorWithRed:.02 green:.48 blue:.66 alpha:1.0]; // Unused. Kept as an example. UIColor *myPink = [UIColor colorWithRed:.93 green:.36 blue:.62 alpha:1.0]; UIFont *thickFont = [UIFont fontWithName:@"HelveticaNeue-Bold" size:fontSize]; UIFont *thinFont = [UIFont fontWithName:@"HelveticaNeue-Light" size:fontSize]; thinFont = [UIFont fontWithName:@"HelveticaNeue-Medium" size:fontSize]; // Define attributes dictionary for bold text. NSDictionary *boldAttributes = [NSDictionary dictionaryWithObjectsAndKeys: thickFont, NSFontAttributeName, myPink, NSForegroundColorAttributeName, nil]; // Find range of text to make bold. NSString *textToBeBoldAndPink = @"beauty"; NSRange boldAndPinkRange = [myString rangeOfString:textToBeBoldAndPink]; // Define attributes dictionary for thin text. NSDictionary *thinAttributes = [NSDictionary dictionaryWithObjectsAndKeys: thinFont, NSFontAttributeName, myPink, NSForegroundColorAttributeName, nil]; // Find range of text to make thin. NSString *textToBeThin; // textToBeThin= @"club®"; // with R textToBeThin= @"club™"; // with TM NSRange thinTextRange = [myString rangeOfString:textToBeThin]; // Make the basic attributed string NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:myString attributes:@{NSFontAttributeName: [fnt fontWithSize:fontSize]}]; // Apply bold and thin formatting to strings using appropriate ranges. [attributedString setAttributes:boldAttributes range:boldAndPinkRange]; [attributedString setAttributes:thinAttributes range:thinTextRange]; // AZ - find position of desired character to superscript in string NSString *charToFind; //charToFind = @"®"; // In case we are using R instead. Just an example. charToFind = @"™"; // In case we are using TM instead. Just an example. NSRange positionOfSuperscriptCharacter = [myString rangeOfString:charToFind]; // Setting the point sizes using exact numbers // NSInteger superscriptCharSize = 12; // CGFloat pointsToRaiseBaseLineOfSupercriptChar = 8.0; // UIColor *colorOfSuperText = myPink; // NSNumber *characterBaselineOffsetUp = [NSNumber numberWithFloat:pointsToRaiseBaseLineOfSupercriptChar]; // Set point size of superscript text relative to display font size as a percentage of original. CGFloat superscriptCharacterPercentOfFullsizeText = 0.60f; // 12 pt if original is 20 point NSInteger superscriptCharSize = fontSize * superscriptCharacterPercentOfFullsizeText ; // Set points to raise superscript text relative to font size as a percentage of original. CGFloat superscriptCharacterPercentOfFullsizeTextToRaiseChar = 0.40f; // 8 points if original is 20 point CGFloat pointsToRaiseBaseLineOfSupercriptChar = fontSize * superscriptCharacterPercentOfFullsizeTextToRaiseChar ; NSNumber *characterBaselineOffsetUp = [NSNumber numberWithFloat:pointsToRaiseBaseLineOfSupercriptChar]; // Set color for text. UIColor *colorOfSuperText = myPink; // Set attributes to be applied to string. NSDictionary *superTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys: [fnt fontWithSize:superscriptCharSize], NSFontAttributeName, colorOfSuperText, NSForegroundColorAttributeName, characterBaselineOffsetUp, NSBaselineOffsetAttributeName, nil]; // Apply the formatting for the superscript to the range of text for the string. [attributedString setAttributes:superTextAttributes range:positionOfSuperscriptCharacter]; return attributedString;
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