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andrey-str/UIFont+ContentSize.h

Created December 25, 2014 09:42
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UIFont + Custon font with Dynamic Sizes
Raw
UIFont+ContentSize.h
#import <UIKit/UIKit.h>
extern NSString* const UIFontTextStyleBoldBody;
@interface UIFont (ContentSize)
+ (UIFont*)preferredSystemFontForTextStyle:(NSString*)textStyle;
@end
Raw
UIFont+ContentSize.m
#import "UIFont+ContentSize.h"
NSString* const UIFontTextStyleBoldBody = @"UIFontTextStyleBoldBody";
@implementation UIFont (ContentSize)
+ (UIFont *)preferredSystemFontForTextStyle:(NSString *)textStyle
{
// choose the font size
CGFloat fontSize = 11.f;
NSString *contentSize = [UIApplication sharedApplication].preferredContentSizeCategory;
static dispatch_once_t onceToken;
static NSDictionary *fontSizeOffsetDictionary;
dispatch_once(&onceToken, ^{
fontSizeOffsetDictionary = @{ UIContentSizeCategoryExtraSmall : @{ UIFontTextStyleBody : @(-2),
UIFontTextStyleBoldBody: @(-2),
UIFontTextStyleHeadline : @(-2),
UIFontTextStyleSubheadline : @(-4),
UIFontTextStyleCaption1 : @(-5),
UIFontTextStyleCaption2 : @(-5),
UIFontTextStyleFootnote : @(-4) },
UIContentSizeCategorySmall : @{ UIFontTextStyleBody : @(-1),
UIFontTextStyleBoldBody: @(-1),
UIFontTextStyleHeadline : @(-1),
UIFontTextStyleSubheadline : @(-3),
UIFontTextStyleCaption1 : @(-5),
UIFontTextStyleCaption2 : @(-5),
UIFontTextStyleFootnote : @(-4) },
UIContentSizeCategoryMedium : @{ UIFontTextStyleBody : @(-2),
UIFontTextStyleBoldBody: @(-2),
UIFontTextStyleHeadline : @(-2),
UIFontTextStyleSubheadline : @(-4),
UIFontTextStyleCaption1 : @(-7),
UIFontTextStyleCaption2 : @(-7),
UIFontTextStyleFootnote : @(-6) },
UIContentSizeCategoryLarge : @{ UIFontTextStyleBody : @(0),
UIFontTextStyleBoldBody: @(0),
UIFontTextStyleHeadline : @(0),
UIFontTextStyleSubheadline : @(-2),
UIFontTextStyleCaption1 : @(-5),
UIFontTextStyleCaption2 : @(-6),
UIFontTextStyleFootnote : @(-4) },
UIContentSizeCategoryExtraLarge : @{ UIFontTextStyleBody : @(2),
UIFontTextStyleBoldBody: @(2),
UIFontTextStyleHeadline : @(2),
UIFontTextStyleSubheadline : @(0),
UIFontTextStyleCaption1 : @(-3),
UIFontTextStyleCaption2 : @(-4),
UIFontTextStyleFootnote : @(-2) },
UIContentSizeCategoryExtraExtraLarge : @{ UIFontTextStyleBody : @(3),
UIFontTextStyleBoldBody: @(3),
UIFontTextStyleHeadline : @(3),
UIFontTextStyleSubheadline : @(1),
UIFontTextStyleCaption1 : @(-2),
UIFontTextStyleCaption2 : @(-3),
UIFontTextStyleFootnote : @(-1) },
UIContentSizeCategoryExtraExtraExtraLarge : @{ UIFontTextStyleBody : @(4),
UIFontTextStyleBoldBody: @(4),
UIFontTextStyleHeadline : @(4),
UIFontTextStyleSubheadline : @(2),
UIFontTextStyleCaption1 : @(-1),
UIFontTextStyleCaption2 : @(-2),
UIFontTextStyleFootnote : @(0) }
};
});
// adjust the default font size based on what the User has set in Settings
CGFloat fontSizeOffset = [fontSizeOffsetDictionary[contentSize][textStyle] doubleValue];
fontSize += fontSizeOffset;
// choose the font weight
if ([textStyle isEqualToString:UIFontTextStyleHeadline] ||
[textStyle isEqualToString:UIFontTextStyleSubheadline] || [textStyle isEqualToString: UIFontTextStyleBoldBody]) {
return [UIFont boldSystemFontOfSize:fontSize];
} else {
return [UIFont systemFontOfSize:fontSize];
}
}
@end
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