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我是IOS新手。 所以我的問題是，我需要得到兩個字形之間的字距。 首先我想是這樣的：在IOS 7中獲取內核號碼
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;
我認爲，對於單個符號寬度將不使用提前。但是我錯了。這對我沒有幫助。比我嘗試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給出了相同的值rect.size.width，甚至在第一個同樣喜歡嘗試size.width
你有任何客串？或者我可以找到答案。 對不起。