iOS Default font is wrong

Felipe Heidrich felipe.heidrich at
Tue Oct 29 11:18:35 PDT 2013

The code Richard sent is creating a dummy font and asking for its size.

The problem is that there are about 3 thousand different fonts on the Mac ;-)

Here we are creating a CTFont. For Mac OS X most native apps probably would be using a NSFont (cause that is what cocoa controls take). Likewise on iOS I think the "common" font is UIFont (cause I think that is what UIKIt controls take).

Could anyone fire up Xcode, create a dummy iOS app, create a UIFont and see what is the size ?


On Oct 29, 2013, at 8:40 AM, Stephen F Northover <steve.x.northover at> wrote:

> If the OS is reporting the wrong value for the default a classic trick is to create a dummy control that normally has the font we want and query that.
> Steve
> On 2013-10-29 11:21 AM, Richard Bair wrote:
>> Hi guys,
>> The default font for iOS is supposed to be System Bold 15 (according to anyway), and it does look more correct to me. Our code is getting to this native method in MacFontFinder.c
>> JNIEXPORT jfloat JNICALL Java_com_sun_javafx_font_MacFontFinder_getSystemFontSize
>>   (JNIEnv *env, jclass obj)
>> {
>>     CTFontRef font = CTFontCreateUIFontForLanguage(
>>                          kCTFontSystemFontType,
>>                          0.0, //get system font with default size
>>                          NULL);
>>     jfloat systemFontDefaultSize = (jfloat) CTFontGetSize (font);
>>     CFRelease(font);
>>     return systemFontDefaultSize;
>> }
>> However it appears the return value is 13 instead of 15 (and I don't know what the actual default font family / weight is that we're returning). It is possible the answer coming from this native API call is "wrong". Any ideas?
>> Richard

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