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Set global font for iOS app in one place
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// Kinda updated for Swift 3.1 | |
// MARK: - Swizzling | |
extension UIFont { | |
class var defaultFontFamily: String { return "Georgia" } | |
override open class func initialize() | |
{ | |
if self == UIFont.self { | |
swizzleSystemFont() | |
} | |
} | |
private class func swizzleSystemFont() | |
{ | |
let systemPreferredFontMethod = class_getClassMethod(self, #selector(UIFont.preferredFont(forTextStyle:))) | |
let mySystemPreferredFontMethod = class_getClassMethod(self, #selector(UIFont.myPreferredFont(forTextStyle:))) | |
method_exchangeImplementations(systemPreferredFontMethod, mySystemPreferredFontMethod) | |
let systemFontMethod = class_getClassMethod(self, #selector(UIFont.systemFont(ofSize:))) | |
let mySystemFontMethod = class_getClassMethod(self, #selector(UIFont.mySystemFont(ofSize:))) | |
method_exchangeImplementations(systemFontMethod, mySystemFontMethod) | |
let boldSystemFontMethod = class_getClassMethod(self, #selector(UIFont.boldSystemFont(ofSize:))) | |
let myBoldSystemFontMethod = class_getClassMethod(self, #selector(UIFont.myBoldSystemFont(ofSize:))) | |
method_exchangeImplementations(boldSystemFontMethod, myBoldSystemFontMethod) | |
let italicSystemFontMethod = class_getClassMethod(self, #selector(UIFont.italicSystemFont(ofSize:))) | |
let myItalicSystemFontMethod = class_getClassMethod(self, #selector(UIFont.myItalicSystemFont(ofSize:))) | |
method_exchangeImplementations(italicSystemFontMethod, myItalicSystemFontMethod) | |
} | |
} | |
// MARK: - New Font Methods | |
extension UIFont { | |
@objc fileprivate class func myPreferredFont(forTextStyle style: String) -> UIFont | |
{ | |
let defaultFont = myPreferredFont(forTextStyle: style) // will not cause stack overflow - this is now the old, default UIFont.preferredFontForTextStyle | |
let newDescriptor = defaultFont.fontDescriptor.withFamily(defaultFontFamily) | |
return UIFont(descriptor: newDescriptor, size: defaultFont.pointSize) | |
} | |
@objc fileprivate class func mySystemFont(ofSize fontSize: CGFloat) -> UIFont | |
{ | |
return myDefaultFont(ofSize: fontSize) | |
} | |
@objc fileprivate class func myBoldSystemFont(ofSize fontSize: CGFloat) -> UIFont | |
{ | |
return myDefaultFont(ofSize: fontSize, withTraits: .traitBold) | |
} | |
@objc fileprivate class func myItalicSystemFont(ofSize fontSize: CGFloat) -> UIFont | |
{ | |
return myDefaultFont(ofSize: fontSize, withTraits: .traitItalic) | |
} | |
@objc fileprivate class func myDefaultFont(ofSize fontSize: CGFloat, withTraits traits: UIFontDescriptorSymbolicTraits = []) -> UIFont | |
{ | |
let descriptor = UIFontDescriptor(name: defaultFontFamily, size: fontSize).withSymbolicTraits(traits) | |
return UIFont(descriptor: descriptor!, size: fontSize) | |
} | |
} |
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