ios - How to check if a character is supported by a font -



ios - How to check if a character is supported by a font -

i'm working on app text field. text wrote in field printed , have issue characters emoji, chinese characters, etc... because font not provide these characters.

it's why want character provided font (the font downloaded can deal straight file or uifont object).

i heard ctfontgetglyphsforcharacters i'm not sure function want , can't work.

here code :

ctfontref fontref = ctfontcreatewithname((cfstringref)font.fontname, font.pointsize, null); nsstring *characters = @"🐯"; // emoji character nsuinteger count = characters.length; cgglyph glyphs[count]; if (ctfontgetglyphsforcharacters(fontref, (const unichar*)[characters cstringusingencoding:nsutf8stringencoding], glyphs, count) == false) nslog(@"ctfontgetglyphsforcharacters failed.");

here ctfontgetglyphsforcharacters homecoming false. it's want because character '🐯' not provided font used. problem when replace nsstring *characters = @"🐯" nsstring *characters = @"abc", ctfontgetglyphsforcharacters homecoming 1 time again false. obviously, font provide glyph ascii characters.

i solve :

- (bool)ischaracter:(unichar)character supportedbyfont:(uifont *)afont { unichar characters[] = { character }; cgglyph glyphs[1] = { }; ctfontref ctfont = ctfontcreatewithname((cfstringref)afont.fontname, afont.pointsize, null); bool ret = ctfontgetglyphsforcharacters(ctfont, characters, glyphs, 1); cfrelease(ctfont); homecoming ret; }

ios objective-c fonts uifont emoji

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