Question

我一直在尝试更改iOS中的原生UIDatePicker中的字体而且我做了，但有一些未解决的细节：

我使用UIDatePicker扩展来更改其标签中的字体：

extension UIDatePicker {

func stylizeView(view: UIView? = nil) {
    let view = view ?? self
    for subview in view.subviews {
        if let label = subview as? UILabel {
            if let text = label.text {
                print("UIDatePicker :: sylizeLabel :: \(text)\n")

                label.font = UIFont(name: "MyriadPro-Light", size: 17)!
            }
        } else { stylizeView(subview) }
    }
}}

因此，您可以深入自定义字体：

struct DatePickerStyle {
let tintColor = UIColor(hex: 0xFFFFFF)
let font = UIFont(name: "MyriadPro-Light", size: 17)!
let fontColor = UIColor(hex: 0x000000)
let fontKern: CGFloat = 0.2
var paragraphStyle: NSMutableParagraphStyle {
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineSpacing =        4
    paragraphStyle.lineHeightMultiple = 1
    paragraphStyle.alignment =          .Right
    return paragraphStyle
    }}

extension UIDatePicker {
func stylizeView(view: UIView? = nil) {
    let style = DatePickerStyle()
    let view = view ?? self
    for subview in view.subviews {
        if let label = subview as? UILabel {
            if let text = label.text {
                print("UIDatePicker :: sylizeLabel :: \(text)\n")

                let attributedString = NSMutableAttributedString(string: text)
                let attributedStringRange = NSMakeRange(0, attributedString.length)

                attributedString.addAttributes([
                    NSParagraphStyleAttributeName:  style.paragraphStyle,
                    NSFontAttributeName:            style.font,
                    NSForegroundColorAttributeName: style.fontColor,
                    NSKernAttributeName:            style.fontKern
                    ], range: attributedStringRange)

                //label.font = style.font
                label.tintColor = style.fontColor
                label.attributedText = attributedString
            }
        } else { stylizeView(subview) }
    }
}

}

此扩展功能在UIDatePicker的任何控制事件上实现：

datePicker.addTarget(self, action: #selector(CellWithDatePicker.updateDatePickerStyle), forControlEvents: .AllEvents)

＆安培;

func updateDatePickerStyle() {
    print(":: updateDatePickerStyle")
    datePicker.stylizeView()
}

问题1：

当我初始化UIDatePicker时，选择器的字体仍然是SanFrancisco。

但是当我在UIDatePicker中更改值时，字体会更改为我的字体

My Font

我尝试在UIDatePicker生命周期的每个阶段实现 datePicker.stylizeView（）或 self.stylizeView（），但它只能更改选定的DatePicker行。< / p>

问题2：

当我在使用newFont设置DatePicker的所有标签时，在pic.2之后旋转DatePicker时，所选行之外的新标签仍然是旧字体（SanFrancisco）。当我停止旋转DatePicker时，所有标签都更新为newFont。

enter image description here

知道怎么解决吗？

Answer 1

使用间隔为0.1的GCD调用样式函数。

示例：

DispatchQueue.main.asyncAfter(deadline: .now() + 0.1)
{
  self.datePicker.stylizeView();ss
}

Answer 2

更改UIDatePickerView字体（直到现在）的唯一方法是麻烦：

您可以通过扩展UILabel来更改字体！（不建议这样做，但是可以！）

import Foundation
import UIKit

public extension UILabel {

    @objc func setFontSwizzled(font: UIFont) {
        if self.shouldOverride() {
            self.setFontSwizzled(font: UIFont.fontWith(style: .regular, size: 14))
        } else {
            self.setFontSwizzled(font: font)
        }
    }

    private func shouldOverride() -> Bool {
        let classes = ["UIDatePicker", "UIDatePickerWeekMonthDayView", "UIDatePickerContentView"]
        var view = self.superview
        while view != nil {
            let className = NSStringFromClass(type(of: view!))
            if classes.contains(className) {
                return true
            }
            view = view!.superview
        }
        return false
    }

    private static let swizzledSetFontImplementation: Void = {
        let instance: UILabel = UILabel()
        let aClass: AnyClass! = object_getClass(instance)
        let originalMethod = class_getInstanceMethod(aClass, #selector(setter: font))
        let swizzledMethod = class_getInstanceMethod(aClass, #selector(setFontSwizzled))

        if let originalMethod = originalMethod, let swizzledMethod = swizzledMethod {
            // switch implementation..
            method_exchangeImplementations(originalMethod, swizzledMethod)
        }
    }()

    static func swizzleSetFont() {
        _ = self.swizzledSetFontImplementation
    }
}

要更改颜色，只需调用以下函数：

datePicker.setValue(UIColor.whiteColor(), forKeyPath: "textColor")

如果有必要重新渲染，则需要致电：

datePicker.datePickerMode = .CountDownTimer
datePicker.datePickerMode = .DateAndTime //or whatever your original mode was

swift UIDatePicker更改字体，字体颜色，字体大小等

2 个答案: