检测iOS上的字体是否为粗体/斜体？ [英] Detect whether a font is bold/italic on iOS?

问题描述

鉴于UIFont或CTFont，如何判断字体是粗体还是斜体？

Given a UIFont or a CTFont, how can I tell whether the font is bold/italic?

推荐答案

查看字体的名称并不总是有效。考虑字体Courier Oblique（斜体）或HoeflerText-Black（粗体），其名称中都不包含粗体或斜体。

Looking at the font's name won't always work. Consider the font "Courier Oblique" (which is italic) or "HoeflerText-Black" (which is bold), Neither of those contain "bold" or "italic" in their names.

如果字体为 CTFontRef ，确定它是粗体还是斜体的正确方法是使用 CTFontGetSymbolicTraits function：

Given a font as a CTFontRef, the proper way to determine whether it's bold or italic is to use the CTFontGetSymbolicTraits function:

CTFontRef font = CTFontCreateWithName((CFStringRef)@"Courier Oblique", 10, NULL);
CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(font);
BOOL isItalic = ((traits & kCTFontItalicTrait) == kCTFontItalicTrait);
BOOL isBold = ((traits & kCTFontBoldTrait) == kCTFontBoldTrait);
NSLog(@"Italic: %i Bold: %i", isItalic, isBold);
CFRelease(font);

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