NSFont+SystemFont

gistfile1.m

//
//  NSFont+SystemFont.h
//  xScope
//
//  Created by Craig Hockenberry on 4/17/14.
//
//  Thanks to http://nshipster.com/method-swizzling/

#import <Cocoa/Cocoa.h>

@interface NSFont (SystemFont)

@end


//
//  NSFont+SystemFont.m
//  xScope
//
//  Created by Craig Hockenberry on 4/17/14.
//
//  Thanks to http://nshipster.com/method-swizzling/


#warning DO NOT USE THIS CODE IN A PRODUCTION BUILD


#import <objc/runtime.h>

#import "NSFont+SystemFont.h"

@implementation NSFont (SystemFont)

static void Swizzle(Class class, SEL originalSelector, SEL swizzledSelector)
{
	Method originalMethod = class_getInstanceMethod(class, originalSelector);
	Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
	
	BOOL didAddMethod =
	class_addMethod(class,
					originalSelector,
					method_getImplementation(swizzledMethod),
					method_getTypeEncoding(swizzledMethod));
	
	if (didAddMethod) {
		class_replaceMethod(class,
							swizzledSelector,
							method_getImplementation(originalMethod),
							method_getTypeEncoding(originalMethod));
	} else {
		method_exchangeImplementations(originalMethod, swizzledMethod);
	}
}

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

		// class methods
		{
			Class class = object_getClass((id)self);

			Swizzle(class, @selector(systemFontOfSize:), @selector(xxx_systemFontOfSize:));
			Swizzle(class, @selector(boldSystemFontOfSize:), @selector(xxx_boldSystemFontOfSize:));
		}
		
		// instance methods
		{
			Class class = [self class];
			
			Swizzle(class, @selector(initWithCoder:), @selector(xxx_initWithCoder:));
		}
		
    });
}

#pragma mark - Method Swizzling

#define MAC_OS_X_VERSION_NT         0

#if MAC_OS_X_VERSION_NT == 1
	#define REPLACEMENT_FONT @"ComicSansMS"
	#define REPLACEMENT_BOLD_FONT @"ComicSansMS-Bold"
#else
	#define REPLACEMENT_FONT @"HelveticaNeue"
	#define REPLACEMENT_BOLD_FONT @"HelveticaNeue-Bold"
#endif


+ (NSFont *)xxx_systemFontOfSize:(CGFloat)fontSize
{
	NSFont *result = [NSFont fontWithName:REPLACEMENT_FONT size:fontSize];
	//NSLog(@"%s result = %@", __PRETTY_FUNCTION__, result);
	return result;
}

+ (NSFont *)xxx_boldSystemFontOfSize:(CGFloat)fontSize
{
	NSFont *result = [NSFont fontWithName:REPLACEMENT_BOLD_FONT size:fontSize];
	//NSLog(@"%s result = %@", __PRETTY_FUNCTION__, result);
	return result;
}

- (id)xxx_initWithCoder:(NSCoder *)coder
{
	NSFont *result = nil;
	
	NSFont *originalFont = [self xxx_initWithCoder:coder];
	NSString *originalFontName = [originalFont fontName];

	if ([originalFontName isEqualToString:@".LucidaGrandeUI"] || [originalFontName isEqualToString:@"LucidaGrande"]) {
		result = [[NSFont fontWithName:REPLACEMENT_FONT size:[originalFont pointSize]] retain];
		//NSLog(@"%s originalFont = %@ -> result = %@", __PRETTY_FUNCTION__, originalFont, result);
		[originalFont release];
	}
	else if ([originalFontName isEqualToString:@".LucidaGrandeUI-Bold"] || [originalFontName isEqualToString:@"LucidaGrande-Bold"]) {
		result = [[NSFont fontWithName:REPLACEMENT_BOLD_FONT size:[originalFont pointSize]] retain];
		//NSLog(@"%s originalFont = %@ -> result = %@", __PRETTY_FUNCTION__, originalFont, result);
		[originalFont release];
	}
	else {
		result = originalFont;
		//NSLog(@"%s result = %@", __PRETTY_FUNCTION__, result);
	}
	
	return result;
}

@end