如何在iOS 9上的UILabel中获取等宽数字 [英] How to get monospaced numbers in UILabel on iOS 9

问题描述

在WWDC 2015上，有一个关于新旧金山系统字体的会话在iOS 9中。当与iOS 9 SDK链接时，它默认使用比例数字渲染而不是等宽数字。在NSFont上有一个方便的初始化程序，名为 NSFont.monospacedDigitsSystemFontOfSize（mySize weight：），可用于显式启用等宽数字显示。

At WWDC 2015, there was a session about the new "San Francisco" system font in iOS 9. It uses proportional number rendering instead of monospaced numbers by default when linked against the iOS 9 SDK. There is a convenient initializer on NSFont called NSFont.monospacedDigitsSystemFontOfSize(mySize weight:) that can be used to explicitly enable monospaced number display.

但是我在 UIFont 上找不到 UIKit 的等价物。

However I couldn't find the UIKit equivalent for this on UIFont.

推荐答案

Handy UIFont 扩展名：

Handy UIFont extension:

extension UIFont {

    var monospacedDigitFont: UIFont {
        let oldFontDescriptor = fontDescriptor()
        let newFontDescriptor = oldFontDescriptor.monospacedDigitFontDescriptor
        return UIFont(descriptor: newFontDescriptor, size: 0)
    }

}

private extension UIFontDescriptor {

    var monospacedDigitFontDescriptor: UIFontDescriptor {
        let fontDescriptorFeatureSettings = [[UIFontFeatureTypeIdentifierKey: kNumberSpacingType, UIFontFeatureSelectorIdentifierKey: kMonospacedNumbersSelector]]
        let fontDescriptorAttributes = [UIFontDescriptorFeatureSettingsAttribute: fontDescriptorFeatureSettings]
        let fontDescriptor = self.fontDescriptorByAddingAttributes(fontDescriptorAttributes)
        return fontDescriptor
    }

}

用于 @IBOutlet 属性：

@IBOutlet private var timeLabel: UILabel? {
    didSet {
        timeLabel.font = timeLabel.font.monospacedDigitFont
    }
}

GitHub 上的最新版本。

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