如何在Xcode Story Board中添加有关多设备的动态字体大小

我做了一堂课

class UILabelDeviceClass : UILabel {

@IBInspectable var iPhoneFontSize:CGFloat = 0 {
    didSet {
        overrideFontSize(iPhoneFontSizE)
    }
}

func overrideFontSize(fontSize:CGFloat){
    let currentFontName = self.font.fontName
    var calculatedFont: UIFont?
    let bounds = UIScreen.mainScreen().bounds
    let height = bounds.size.height
    switch height {
    case 480.0: //Iphone 3,4,SE => 3.5 inch
        calculatedFont = UIFont(name: currentFontName,size: fontSize * 0.7)
        self.font = calculatedFont
        break
    case 568.0: //iphone 5,5s => 4 inch
        calculatedFont = UIFont(name: currentFontName,size: fontSize * 0.8)
        self.font = calculatedFont
        break
    case 667.0: //iphone 6,6s => 4.7 inch
        calculatedFont = UIFont(name: currentFontName,size: fontSize * 0.9)
        self.font = calculatedFont
        break
    case 736.0: //iphone 6s+ 6+ => 5.5 inch
        calculatedFont = UIFont(name: currentFontName,size: fontSizE)
        self.font = calculatedFont
        break
    default:
        print("not an iPhone")
        break
    }

}

}

然后,设置类

然后,设定价值

快乐的编码！