Open Radar

 
Summary:
Starting in El Capitan beta 2, [NSString sizeWithAttributes:] does not respect a font's fontDescriptor's NSFontFixedAdvanceAttribute setting in El Capitan. As of beta 4, the bug still exists.

Steps to Reproduce:
1. Install Xcode on 10.11.
2. Compile included program foo.m from terminal with "clang -fobjc-arc -framework Cocoa foo.m -o foo".
3. Execute foo executable.

Expected Results:
The output from the program "foo" should show:

1) maxAdvance=8.000000
2) charWidth=8.000000

which it does on any version of OS X prior to 10.11 beta 2.

Actual Results:
The output instead shows when run on 10.11:

1) maxAdvance=8.000000
2) charWidth=7.224609

Version:
OS X El Capitan/15A226f

Notes:
Although I can code around this problem in the current release of my application, I can't make changes to much earlier releases of my application that many users still use and would use in 10.11. This affects output in my application because I draw text with fixed width fonts using integer coordinates and integer advancement.

Configuration:
I get the correct output on any version of OS X prior to 10.11 beta 2. I get the incorrect result on 10.11 beta2 to beta 4.

foo.m:

#import <Cocoa/Cocoa.h>

int main(int argc, char *argv[])
{
        NSString *system = [[NSDictionary dictionaryWithContentsOfFile:@"/System/Library/CoreServices/SystemVersion.plist"] objectForKey:@"ProductVersion"] ;
        NSLog(@"ProductVersion=%@", system) ;

        NSString *string = @"Wg" ;

        NSFont *font = [NSFont userFixedPitchFontOfSize:12.] ;
        CGFloat maxAdvance = ceilf(font.maximumAdvancement.width) ;
        printf("1) maxAdvance=%f\n", maxAdvance) ;

        NSFontDescriptor *descriptor = [font.fontDescriptor fontDescriptorByAddingAttributes:@{NSFontFixedAdvanceAttribute: [NSNumber numberWithDouble:maxAdvance]}] ;
        font = [NSFont fontWithDescriptor:descriptor size:font.pointSize] ;
        printf("2) charWidth=%f\n", [string sizeWithAttributes:@{NSFontAttributeName: font}].width/2.) ;

        return(0) ;
}