Using custom font for entire iOS app swift

You can set the appearance of the UILabel and other UIViews:

UILabel.appearance().font = UIFont(name: "yourFont", size: yourSize)

More General:

AnyUIView.appearance().font = UIFont(name: "yourFont", size: yourSize)

As a more detailed answer and with these benefits I recommend using extensions:

No size override (whatever you set in designer will be used)
No style override (Bold, Light, Medium, UltraLight is implemented in my code but you can customize it as you need)

import UIKit

extension UILabel {
    @objc var substituteFontName : String {
        get {
            return self.font.fontName;
        }
        set {
            let fontNameToTest = self.font.fontName.lowercased();
            var fontName = newValue;
            if fontNameToTest.range(of: "bold") != nil {
                fontName += "-Bold";
            } else if fontNameToTest.range(of: "medium") != nil {
                fontName += "-Medium";
            } else if fontNameToTest.range(of: "light") != nil {
                fontName += "-Light";
            } else if fontNameToTest.range(of: "ultralight") != nil {
                fontName += "-UltraLight";
            }
            self.font = UIFont(name: fontName, size: self.font.pointSize)
        }
    }
}

extension UITextView {
    @objc var substituteFontName : String {
        get {
            return self.font?.fontName ?? "";
        }
        set {
            let fontNameToTest = self.font?.fontName.lowercased() ?? "";
            var fontName = newValue;
            if fontNameToTest.range(of: "bold") != nil {
                fontName += "-Bold";
            } else if fontNameToTest.range(of: "medium") != nil {
                fontName += "-Medium";
            } else if fontNameToTest.range(of: "light") != nil {
                fontName += "-Light";
            } else if fontNameToTest.range(of: "ultralight") != nil {
                fontName += "-UltraLight";
            }
            self.font = UIFont(name: fontName, size: self.font?.pointSize ?? 17)
        }
    }
}

extension UITextField {
    @objc var substituteFontName : String {
        get {
            return self.font?.fontName ?? "";
        }
        set {
            let fontNameToTest = self.font?.fontName.lowercased() ?? "";
            var fontName = newValue;
            if fontNameToTest.range(of: "bold") != nil {
                fontName += "-Bold";
            } else if fontNameToTest.range(of: "medium") != nil {
                fontName += "-Medium";
            } else if fontNameToTest.range(of: "light") != nil {
                fontName += "-Light";
            } else if fontNameToTest.range(of: "ultralight") != nil {
                fontName += "-UltraLight";
            }
            self.font = UIFont(name: fontName, size: self.font?.pointSize ?? 17)
        }
    }
}

Samples for using Extensions:

e.g. put these lines in your starting controller viewDidLoad

UILabel.appearance().substituteFontName = "IRANSans"; // USE YOUR FONT NAME INSTEAD
UITextView.appearance().substituteFontName = "IRANSans"; // USE YOUR FONT NAME INSTEAD
UITextField.appearance().substituteFontName = "IRANSans"; // USE YOUR FONT NAME INSTEAD

P.S. as @Christian mentioned, you can write your own extensions for almost AnyUIView

FINALLY figured this out. Cleanest way I could find. (Swift 4) Solution doesn't require you to set font sizes and won't override all font sizes.

  UILabel.appearance().font = UIFont.preferredFont(forTextStyle: UIFontTextStyle(rawValue: "Roboto"))

For those looking for where to place this code. I put it in my AppDelegate.swift file inside of

 func application(_ application: UIApplication, 
 didFinishLaunchingWithOptions...

Swift 4.2

 UILabel.appearance().font = UIFont.preferredFont(forTextStyle: UIFont.TextStyle(rawValue: "Roboto"))

Using custom font for entire iOS app swift

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