How to default UILabel Font and Size using Swift

问题

I find UISegmentedControl change font and size like this :

UISegmentedControl.appearance().setTitleTextAttributes(myFontAttribute as [NSObject : AnyObject] , forState: .Normal)

but UILabel have no this method

I want to do like

UILabel.appearance().setAttributed(myFontAttribute)

I don't want to change UILabel font in StoryBoard

I want to using program to do this (because my app is done, but only font should change to bigger and other font)

What should I do ?

回答1:

First you need to add extension to UILabel :

extension UILabel{
    var defaultFont: UIFont? {
        get { return self.font }
        set { self.font = newValue }
    }
}

Second use appearance to set it:

    UILabel.appearance().defaultFont = UIFont.systemFont(ofSize: 25)

Hope it helps.

回答2:

You can change the label font programmatically like this

label.font = UIFont(name: label.font.fontName, size: 14)

Change font size only with bold

label.font = UIFont.boldSystemFontOfSize(18)

Change font size only

label.font = label.font.fontWithSize(14)

回答3:

if you want to change the size of font, used below lines of code :

for Swift 3 :

label.font = label.font.withSize(20)

回答4:

You can use this simple code in swift

myLabel.attributedText = NSMutableAttributedString(string: myLabel.text!, attributes: [NSFontAttributeName:UIFont(name: "YourFont", size: 12), NSForegroundColorAttributeName: UIColor.whiteColor()])

来源：https://stackoverflow.com/questions/36323751/how-to-default-uilabel-font-and-size-using-swift