session-ios/SignalUtilitiesKit/Utilities/UIFont+OWS.m
2021-01-12 11:25:31 +11:00

233 lines
5.9 KiB
Objective-C

//
// Copyright (c) 2019 Open Whisper Systems. All rights reserved.
//
#import "UIFont+OWS.h"
NS_ASSUME_NONNULL_BEGIN
@implementation UIFont (OWS)
+ (UIFont *)ows_thinFontWithSize:(CGFloat)size
{
return [UIFont systemFontOfSize:size weight:UIFontWeightThin];
}
+ (UIFont *)ows_lightFontWithSize:(CGFloat)size
{
return [UIFont systemFontOfSize:size weight:UIFontWeightLight];
}
+ (UIFont *)ows_regularFontWithSize:(CGFloat)size
{
return [UIFont systemFontOfSize:size weight:UIFontWeightRegular];
}
+ (UIFont *)ows_mediumFontWithSize:(CGFloat)size
{
return [UIFont systemFontOfSize:size weight:UIFontWeightMedium];
}
+ (UIFont *)ows_boldFontWithSize:(CGFloat)size
{
return [UIFont boldSystemFontOfSize:size];
}
+ (UIFont *)ows_monospacedDigitFontWithSize:(CGFloat)size;
{
return [self monospacedDigitSystemFontOfSize:size weight:UIFontWeightRegular];
}
#pragma mark - Icon Fonts
+ (UIFont *)ows_fontAwesomeFont:(CGFloat)size
{
return [UIFont fontWithName:@"FontAwesome" size:size];
}
+ (UIFont *)ows_dripIconsFont:(CGFloat)size
{
return [UIFont fontWithName:@"dripicons-v2" size:size];
}
+ (UIFont *)ows_elegantIconsFont:(CGFloat)size
{
return [UIFont fontWithName:@"ElegantIcons" size:size];
}
#pragma mark - Dynamic Type
+ (UIFont *)ows_dynamicTypeTitle1Font
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleTitle1];
}
+ (UIFont *)ows_dynamicTypeTitle2Font
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleTitle2];
}
+ (UIFont *)ows_dynamicTypeTitle3Font
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleTitle3];
}
+ (UIFont *)ows_dynamicTypeHeadlineFont
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];
}
+ (UIFont *)ows_dynamicTypeBodyFont
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
}
+ (UIFont *)ows_dynamicTypeSubheadlineFont
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
}
+ (UIFont *)ows_dynamicTypeFootnoteFont
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote];
}
+ (UIFont *)ows_dynamicTypeCaption1Font
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleCaption1];
}
+ (UIFont *)ows_dynamicTypeCaption2Font
{
return [UIFont preferredFontForTextStyle:UIFontTextStyleCaption2];
}
#pragma mark - Dynamic Type Clamped
+ (UIFont *)preferredFontForTextStyleClamped:(UIFontTextStyle)fontTextStyle
{
// We clamp the dynamic type sizes at the max size available
// without "larger accessibility sizes" enabled.
static NSDictionary<UIFontTextStyle, NSNumber *> *maxPointSizeMap = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
NSMutableDictionary<UIFontTextStyle, NSNumber *> *map = [@{
UIFontTextStyleTitle1 : @(34.0),
UIFontTextStyleTitle2 : @(28.0),
UIFontTextStyleTitle3 : @(26.0),
UIFontTextStyleHeadline : @(23.0),
UIFontTextStyleBody : @(23.0),
UIFontTextStyleSubheadline : @(21.0),
UIFontTextStyleFootnote : @(19.0),
UIFontTextStyleCaption1 : @(18.0),
UIFontTextStyleCaption2 : @(17.0),
} mutableCopy];
map[UIFontTextStyleLargeTitle] = @(40.0);
maxPointSizeMap = map;
});
UIFont *font = [UIFont preferredFontForTextStyle:fontTextStyle];
NSNumber *_Nullable maxPointSize = maxPointSizeMap[fontTextStyle];
if (maxPointSize) {
if (maxPointSize.floatValue < font.pointSize) {
return [font fontWithSize:maxPointSize.floatValue];
}
} else {
OWSFailDebug(@"Missing max point size for style: %@", fontTextStyle);
}
return font;
}
+ (UIFont *)ows_dynamicTypeLargeTitle1ClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleLargeTitle];
}
+ (UIFont *)ows_dynamicTypeTitle1ClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleTitle1];
}
+ (UIFont *)ows_dynamicTypeTitle2ClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleTitle2];
}
+ (UIFont *)ows_dynamicTypeTitle3ClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleTitle3];
}
+ (UIFont *)ows_dynamicTypeHeadlineClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleHeadline];
}
+ (UIFont *)ows_dynamicTypeBodyClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleBody];
}
+ (UIFont *)ows_dynamicTypeSubheadlineClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleSubheadline];
}
+ (UIFont *)ows_dynamicTypeFootnoteClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleFootnote];
}
+ (UIFont *)ows_dynamicTypeCaption1ClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleCaption1];
}
+ (UIFont *)ows_dynamicTypeCaption2ClampedFont
{
return [UIFont preferredFontForTextStyleClamped:UIFontTextStyleCaption2];
}
#pragma mark - Styles
- (UIFont *)ows_italic
{
return [self styleWithSymbolicTraits:UIFontDescriptorTraitItalic];
}
- (UIFont *)ows_bold
{
return [self styleWithSymbolicTraits:UIFontDescriptorTraitBold];
}
- (UIFont *)styleWithSymbolicTraits:(UIFontDescriptorSymbolicTraits)symbolicTraits
{
UIFontDescriptor *fontDescriptor = [self.fontDescriptor fontDescriptorWithSymbolicTraits:symbolicTraits];
UIFont *font = [UIFont fontWithDescriptor:fontDescriptor size:0];
OWSAssertDebug(font);
return font ?: self;
}
- (UIFont *)ows_mediumWeight
{
// The recommended approach of deriving "medium" weight fonts for dynamic
// type fonts is:
//
// [UIFontDescriptor fontDescriptorByAddingAttributes:...]
//
// But this doesn't seem to work in practice on iOS 11 using UIFontWeightMedium.
UIFont *derivedFont = [UIFont systemFontOfSize:self.pointSize weight:UIFontWeightMedium];
return derivedFont;
}
- (UIFont *)ows_monospaced
{
return [self.class ows_monospacedDigitFontWithSize:self.pointSize];
}
@end
NS_ASSUME_NONNULL_END