ios - Certain fonts not showing up?

Question

I have a list of font names in my app, which are all displayed in the font they represent. The following three do not work though:

ArialRoundedMTBold
ChalkboardSE-Bold
TrebuchetMS-Bold

Instead they display in the standard font.

Any ideas why these might not be showing up?

Answer 1

How to configure a custom font

To use a custom font (one not included in iOS) you have to edit your <appname>-Info.plist file and create a new UIAppFonts key with type array, where each element of the array is a String with the name of your font file. Example: VAGRoundedStd-Light.ttf. You also have to add the file to your project.

Note: When you type UIAppFonts and press enter, the key is converted to "Fonts provided by application".

However, when you use the font in Interface Builder (or with UIFont) you don't use the filename of the font, but the name that appears when you open the font in the application Font Book of your Mac. For the previous example it would be VAG Rounded Std Light.

OS X is more tolerant than iOS digesting TrueType formats, so on rare occasions you may find a font that works in OS X but not in iOS. If that happens, replace the font to see if at least you got the process right.

How to load a font programmatically

This solves the case where the font license requires you to distribute the font encrypted.

1. First step is to encrypt and decrypt the font with whatever algorithm you see fit.
2. Load the font as a NSData object and reverse the encryption.
3. Register the font programmatically.

This following recipe is from Loading iOS fonts dynamically by Marco Arment. It makes the fonts available in UIFont and UIWebView. The same code can be used to load fonts from the Internet.

NSData *inData = /* your decrypted font-file data */;
CFErrorRef error;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)inData);
CGFontRef font = CGFontCreateWithDataProvider(provider);
if (! CTFontManagerRegisterGraphicsFont(font, &error)) {
    CFStringRef errorDescription = CFErrorCopyDescription(error)
    NSLog(@"Failed to load font: %@", errorDescription);
    CFRelease(errorDescription);
}
CFRelease(font);
CFRelease(provider);

How to load more than two fonts of the same family

This is the case where iOS refuses to load more than two fonts from the same family.

Here is a code workaround from stackoverflow user Evadne Wu. Simply stick the following in your app delegate (note that it uses two frameworks):

#import <CoreText/CoreText.h>
#import <MobileCoreServices/MobileCoreServices.h>

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    CTFontManagerRegisterFontsForURLs((__bridge CFArrayRef)((^{
        NSFileManager *fileManager = [NSFileManager defaultManager];
        NSURL *resourceURL = [[NSBundle mainBundle] resourceURL];
        NSArray *resourceURLs = [fileManager contentsOfDirectoryAtURL:resourceURL includingPropertiesForKeys:nil options:0 error:nil];
        return [resourceURLs filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(NSURL *url, NSDictionary *bindings) {
            CFStringRef pathExtension = (__bridge CFStringRef)[url pathExtension];
            NSArray *allIdentifiers = (__bridge_transfer NSArray *)UTTypeCreateAllIdentifiersForTag(kUTTagClassFilenameExtension, pathExtension, CFSTR("public.font"));
            if (![allIdentifiers count]) {
                return NO;
            }
            CFStringRef utType = (__bridge CFStringRef)[allIdentifiers lastObject];
            return (!CFStringHasPrefix(utType, CFSTR("dyn.")) && UTTypeConformsTo(utType, CFSTR("public.font")));

        }]];
    })()), kCTFontManagerScopeProcess, nil);

    return YES;
}

Available as gist. Commented in the author blog: Loading 2+ fonts on iOS from the same font family.

---

An alternative, more involved workaround from pixeldock.com:

If you add more than 2 font variants of the same font family (e.g. “Normal”, “Bold” and “Extended”), only the last two font variants that you added to the project will be usable.

If you see this happening, it is a limitation of your SDK version, and the only way out of it is editing the font family with a Font editor like Fontforge. Again, from pixeldock.com:

1. Open your Font in Fontforge
2. Goto ‘Element’ -> ‘Font Info’ and change the ‘Family Name’ field
3. Goto ‘Element’ -> ‘TTF Names’ and change the fields ‘Family’ and ‘Preferred Family’
4. Goto ‘File’ -> ‘Generate Fonts’ and save your edited font