I'm new in IOS. So my problem is, that I need to get kerning between two glyphs. First I tried like this:
NSString *text = @"AB";
NSDictionary* stringAttrs = @{ NSFontAttributeName : self.level.font,
NSKernAttributeName:@0.0f };
CGSize size = [text sizeWithAttributes:stringAttrs];
//For better understanding
NSString *textA = @"A";
NSString *textB = @"B";
CGSize sizeA = [text sizeWithAttributes:stringAttrs];
CGSize sizeB = [text sizeWithAttributes:stringAttrs];
double kerning = size.width - sizeA.width - size.widthB;
I thought that, for single symbol width would be without advance. But I was wrong. It's did't help me. Than I tried CoreText.
CFStringRef str = (__bridge CFStringRef)@"A";
CFIndex count = CFStringGetLength(str);
CTFontRef font = CTFontCreateWithName((CFStringRef)@"Lora", 100, NULL);
UniChar *characters = (UniChar *)malloc(sizeof(UniChar) * count);
CGGlyph *glyphs = (CGGlyph *)malloc(sizeof(CGGlyph) * count);
CFStringGetCharacters(str, CFRangeMake(0, count), characters);
CTFontGetGlyphsForCharacters(font, characters, glyphs, count);
CGSize *sizeCore = malloc(count * sizeof(CGSize));
CGRect *rectCore = malloc(count * sizeof(CGRect));
double adv = CTFontGetAdvancesForGlyphs (font,
kCTFontHorizontalOrientation,
glyphs,
sizeCore,
count);
CGRect rect = CTFontGetBoundingRectsForGlyphs (font,
kCTFontHorizontalOrientation,
glyphs,
rectCore,
count);
double kerning = adv - rect.size.width; (== 0)
adv gave the same value as rect.size.width and even the same like in first try size.width
Do you have any gues? Or link were I can find an answer. Sorry for mistakes.
