如何将CGFontRef转换成UIFont？

Question

我想使用自定义字体UILabel.自定义字体由文件加载:

NSString *fontPath = ... ; // a TTF file in iPhone Documents folder
CGDataProviderRef fontDataProvider = CGDataProviderCreateWithFilename([fontPath UTF8String]);
CGFontRef customFont = CGFontCreateWithDataProvider(fontDataProvider);
CGDataProviderRelease(fontDataProvider); 

我怎样才能转换CGFontRef为UIFont以中使用[UILabel setFont:]？

Answer 1

康拉德的答案很接近但不太有效.您需要为UIFont提供PostScript名称,而不是全名.

NSString *fontName = (NSString *)CGFontCopyPostScriptName(fontRef);
UIFont *font = [UIFont fontWithName:fontName size:someSize]

Answer 2

你不能直接转换CGFontRef,UIFont但你可以注册CGFontRef使用CTFontManagerRegisterGraphicsFont,然后创建相应的UIFont.

NSString* fpath = [documentsDirectory stringByAppendingPathComponent:@"custom_font_file_name.ttf"];
CGDataProviderRef fontDataProvider = CGDataProviderCreateWithFilename([fpath UTF8String]);
CGFontRef customFont = CGFontCreateWithDataProvider(fontDataProvider);
CGDataProviderRelease(fontDataProvider);
NSString *fontName = (__bridge NSString *)CGFontCopyFullName(customFont);
CFErrorRef error;
CTFontManagerRegisterGraphicsFont(customFont, &error);
CGFontRelease(customFont);
UIFont* uifont = [UIFont fontWithName:fontName size:12];

Answer 3

CTFontRef并且UIFont是免费桥接的，所以你可以把你的CGFont变成 aCTFont然后把它变成 a UIFont：

CTFontRef ctFont = CTFontCreateWithGraphicsFont(cgFont, pointSize, NULL, NULL);
UIFont *uiFont = CFBridgingRelease(ctFont);