Custom Font Sizing in Xcode 6 Size Classes not working properly with Custom Fonts

Question

Xcode 6 has a new feature where fonts and font sizes in UILabel, UITextField, and UIButton can be s

Answer 1

None of these worked for me, but this did. You also need to use the system font in IB

#import <UIKit/UIKit.h>

@interface UILabelEx : UILabel


@end

#import "UILabelEx.h"
#import "Constants.h"

@implementation UILabelEx

- (void) traitCollectionDidChange: (UITraitCollection *) previousTraitCollection {
    [super traitCollectionDidChange: previousTraitCollection];

    self.font = [UIFont fontWithName:APP_FONT size:self.font.pointSize];   
}
@end

Answer 2

• add Fonts provided by application into your app .plist
• add your .ttf file to item 0
• use it [UIFont fontWithName:"example.ttf" size:10]

Answer 3

The bug is still valid in XCode 7.0 GM.

Razor28's solution causes infinite loops in some cases. My experience has been with using it in conjunction with SwipeView.

Instead, I suggest that you:

1) Subclass UILabel and override setFont:

- (void)setFont:(UIFont *)font
{
    font = [UIFont fontWithName:(@"Montserrat") size:font.pointSize];
    [super setFont:font];
}

2) Set the custom class of your UILabels and then set the font size classes by using System font

Answer 4

After trying everything, I eventually settled on a combination of the above solutions. Using Xcode 7.2, Swift 2.

import UIKit

class LabelDeviceClass : UILabel {

    @IBInspectable var iPhoneSize:CGFloat = 0 {
        didSet {
            if isPhone() {
                overrideFontSize(iPhoneSize)
            }
        }
    }

    @IBInspectable var iPadSize:CGFloat = 0 {
        didSet {
            if isPad() {
                overrideFontSize(iPadSize)
            }
        }
    }

    func isPhone() -> Bool {
        // return UIDevice.currentDevice().userInterfaceIdiom == .Phone
        return !isPad()
    }

    func isPad() -> Bool {
        // return UIDevice.currentDevice().userInterfaceIdiom == .Pad
        switch (UIScreen.mainScreen().traitCollection.horizontalSizeClass, UIScreen.mainScreen().traitCollection.verticalSizeClass) {
        case (.Regular, .Regular):
            return true
        default:
            return false
        }
    }

    func overrideFontSize(fontSize:CGFloat){
        let currentFontName = self.font.fontName
        if let calculatedFont = UIFont(name: currentFontName, size: fontSize) {
            self.font = calculatedFont
        }
    }

}

• @IBInspectable lets you set the font size in the Storyboard
• It uses a didSet observer, to avoid the pitfalls from layoutSubviews() (infinite loop for dynamic table view row heights) and awakeFromNib() (see @cocoaNoob's comment)
• It uses size classes rather than the device idiom, in hopes of eventually using this with @IBDesignable
• Sadly, @IBDesignable doesn't work with traitCollection according to this other stack article
• The trait collection switch statement is performed on UIScreen.mainScreen() rather than self per this stack article

Answer 5

A combination of some of the later answers above were helpful. Here's how I solved the IB bug via a Swift UILabel extension:

import UIKit

// This extension is only required as a work-around to an interface builder bug in XCode 7.3.1
// When custom fonts are set per size class, they are reset to a small system font
// In order for this extension to work, you must set the fonts in IB to System
// We are switching any instances of ".SFUIDisplay-Bold" to "MuseoSans-700" and ".SFUIDisplay-Regular" to "MuseoSans-300" and keeping the same point size as specified in IB

extension UILabel {
    override public func traitCollectionDidChange(previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)

        if ((traitCollection.verticalSizeClass != previousTraitCollection?.verticalSizeClass) || traitCollection.horizontalSizeClass != previousTraitCollection?.horizontalSizeClass) {
            //let oldFontName = "\(font.fontName)-\(font.pointSize)"

            if (font.fontName == systemFontRegular) {
                font = UIFont(name: customFontRegular, size: (font?.pointSize)!)
                //xlog.debug("Old font: \(oldFontName) -> new Font: \(font.fontName) - \(font.pointSize)")
            }
            else if (font.fontName == systemFontBold) {
                font = UIFont(name: customFontBold, size: (font?.pointSize)!)
                //xlog.debug("Old font: \(oldFontName) -> new Font: \(font.fontName) - \(font.pointSize)")
            }
        }
    }
}

Answer 6

I am using Swift, XCode 6.4. So this is what I did

import Foundation
import UIKit

    @IBDesignable class ExUILabel: UILabel {

        @IBInspectable var fontName: String = "Default-Font" {
            didSet {
                self.font = UIFont(name: fontName, size:self.font.pointSize)
            }
        }

        override func layoutSubviews() {
            super.layoutSubviews()
            self.font = UIFont(name: fontName, size:self.font.pointSize)
        }
    }

1. Goto Designer -> Identity Inspector -> Set the class to ExUILabel

2. Then go to Attribute inspector in designer and set the font name.