List of monospace font

gistfile1.m

// UIFontDescriptor on iOS 7 or later

    NSDictionary *traitsAttributes = @{UIFontSymbolicTrait: @(UIFontDescriptorTraitMonoSpace)};
    NSDictionary *fontAttributes = @{UIFontDescriptorTraitsAttribute: traitsAttributes};
    UIFontDescriptor *fontDescriptor = [UIFontDescriptor fontDescriptorWithFontAttributes:fontAttributes];
    NSArray *array = [fontDescriptor matchingFontDescriptorsWithMandatoryKeys:nil];
    for (UIFontDescriptor *descriptor in array) {
        NSLog(@"%@", descriptor.postscriptName);
//        NSLog(@"%@", [descriptor objectForKey:UIFontDescriptorNameAttribute]);
//        NSLog(@"%@", [descriptor objectForKey:UIFontDescriptorVisibleNameAttribute]);
//        NSLog(@"%@", [descriptor objectForKey:UIFontDescriptorFamilyAttribute]);
//        NSLog(@"%@", [descriptor objectForKey:UIFontDescriptorFaceAttribute]);
    }
//    NSLog(@"%@", array);

gistfile2.m

// CTFontDescriptorRef on iOS and OS X

    NSDictionary *traitsAttributes = @{(id)kCTFontSymbolicTrait: @(kCTFontMonoSpaceTrait)};
    NSDictionary *fontAttributes = @{(id)kCTFontTraitsAttribute: traitsAttributes};
    CTFontDescriptorRef fontDescriptor = CTFontDescriptorCreateWithAttributes((CFDictionaryRef)fontAttributes);
    CFArrayRef array = CTFontDescriptorCreateMatchingFontDescriptors(fontDescriptor, NULL);
    CFIndex count = CFArrayGetCount(array);
    for (int i=0; i<count; i++) {
        CTFontDescriptorRef descriptor =CFArrayGetValueAtIndex(array, i);
        NSLog(@"%@", CFBridgingRelease(CTFontDescriptorCopyAttribute(descriptor, kCTFontNameAttribute)));
//        NSLog(@"%@", CFBridgingRelease(CTFontDescriptorCopyAttribute(descriptor, kCTFontDisplayNameAttribute)));
//        NSLog(@"%@", CFBridgingRelease(CTFontDescriptorCopyAttribute(descriptor, kCTFontFamilyNameAttribute)));
//        NSLog(@"%@", CFBridgingRelease(CTFontDescriptorCopyAttribute(descriptor, kCTFontStyleNameAttribute)));
    }
//    CFShow(array);
    CFRelease(fontDescriptor);
    CFRelease(array);

gistfile3.m

// NSFontDescriptor on OS X

    NSDictionary *traitsAttributes = @{NSFontSymbolicTrait: @(NSFontMonoSpaceTrait)};
    NSDictionary *fontAttributes = @{NSFontTraitsAttribute: traitsAttributes};
    NSFontDescriptor *fontDescriptor = [NSFontDescriptor fontDescriptorWithFontAttributes:fontAttributes];
    NSArray *array = [fontDescriptor matchingFontDescriptorsWithMandatoryKeys:nil];
    for (NSFontDescriptor *descriptor in array) {
        NSLog(@"%@", descriptor.postscriptName);
//        NSLog(@"%@", [descriptor objectForKey:NSFontNameAttribute]);
//        NSLog(@"%@", [descriptor objectForKey:NSFontVisibleNameAttribute]);
//        NSLog(@"%@", [descriptor objectForKey:NSFontFamilyAttribute]);
//        NSLog(@"%@", [descriptor objectForKey:NSFontFaceAttribute]);
    }
//    NSLog(@"%@", array);