如何以编程方式更改uisegmentedcontrol的字体大小和字体名称？我用过迅速。
这是我的代码：
self.mysegmentedControl = UISegmentedControl(items: [
NSLocalizedString("Aaaaaa", comment: ""),
NSLocalizedString("Bbbbbb", comment: ""),
NSLocalizedString("Cccccc", comment: ""),
NSLocalizedString("Dddddd", comment: ""),
NSLocalizedString("Eeeeee", comment: ""),
])
self.mysegmentedControl.addTarget(self, action: "mysegmentedControlDidChange:", forControlEvents: .ValueChanged)
self.mysegmentedControl.selectedSegmentIndex = 0
问候
UI可以使用控件外观，最好的添加位置是在应用程序委托中，didFinishLaunchingWithOptions方法，如果您想一次为项目中的每个UISegmentedControls设置相同的属性，请使用此控件：
let attr = NSDictionary(object: UIFont(name: "HelveticaNeue-Bold", size: 16.0)!, forKey: NSFontAttributeName)
UISegmentedControl.appearance().setTitleTextAttributes(attr as [NSObject : AnyObject] , forState: .Normal)
但是，如果您要仅将属性设置为一个UISegmentedControl，或者如果您希望基于某些条件更频繁地更改属性，请使用此UISegmentedControl方法：
func setTitleTextAttributes(_ attributes: [NSObject : AnyObject]?,
forState state: UIControlState)
示例：
let attr = NSDictionary(object: UIFont(name: "HelveticaNeue-Bold", size: 16.0)!, forKey: NSFontAttributeName)
seg.setTitleTextAttributes(attr as [NSObject : AnyObject] , forState: .Normal)
Swift 4
@IBOutlet var sgmentTypeSelect: UISegmentedControl!{
didSet {
let normalTextAttributes: [NSAttributedStringKey : AnyObject] = [
NSAttributedStringKey.foregroundColor : UIColor.themeGold,
NSAttributedStringKey.font : UIFont.defaultMontserratFont(style: "SemiBold", size: 13)
]
let selectedTextAttributes: [NSAttributedStringKey : AnyObject] = [
NSAttributedStringKey.foregroundColor : UIColor.black,
NSAttributedStringKey.font : UIFont.defaultMontserratFont(style: "Bold", size: 13)
]
sgmentTypeSelect.setTitleTextAttributes(normalTextAttributes, for: .normal)
sgmentTypeSelect.setTitleTextAttributes(normalTextAttributes, for: .highlighted)
sgmentTypeSelect.setTitleTextAttributes(selectedTextAttributes, for: .selected)
}
}
以下是根据批准的答案使用UIAppearance进行更改的细分：
var font = UIFont.FromName("HelveticaNeue-Bold", 16f);
var textAttributes = new UITextAttributes { Font = font };
UISegmentedControl.Appearance.SetTitleTextAttributes(textAttributes,
UIControlState.Normal);
更进一步的是，我一直在玩这些代码，并找到了Swift 5.1的更新代码：
extension UISegmentedControl {
func setFontSize(fontSize: CGFloat) {
let normalTextAttributes: [NSObject : AnyObject] = [
NSAttributedString.Key.foregroundColor as NSObject: UIColor.black,
NSAttributedString.Key.font as NSObject : UIFont.systemFont(ofSize: fontSize, weight: UIFont.Weight.medium)
]
let boldTextAttributes: [NSObject : AnyObject] = [
NSAttributedString.Key.foregroundColor as NSObject : UIColor.black,
NSAttributedString.Key.font as NSObject : UIFont.systemFont(ofSize: fontSize, weight: UIFont.Weight.medium),
]
self.setTitleTextAttributes(normalTextAttributes as? [NSAttributedString.Key : Any], for: .normal)
self.setTitleTextAttributes(normalTextAttributes as? [NSAttributedString.Key : Any], for: .highlighted)
self.setTitleTextAttributes(boldTextAttributes as? [NSAttributedString.Key : Any], for: .selected)
}
}
ViewDidLoad（）中的实现工具相同的部分：
yourSegmentedControl.setFontSize(20)
用于快速3
UISegmentedControl.appearance().setTitleTextAttributes([NSForegroundColorAttributeName:UIColor.white], for: .selected)
对于Swift 4
let font: [AnyHashable : Any] = [NSAttributedStringKey.font : UIFont.systemFont(ofSize: 17)]
segmentedControl.setTitleTextAttributes(font, for: .normal)
此答案已过期，但是对于那些迅速寻求解决方案的人，您可能想尝试这种方法：
func stylizeFonts(){
let normalFont = UIFont(name: "Helvetica", size: 16.0)
let boldFont = UIFont(name: "Helvetica-Bold", size: 16.0)
let normalTextAttributes: [NSObject : AnyObject] = [
NSForegroundColorAttributeName: UIColor.blackColor(),
NSFontAttributeName: normalFont!
]
let boldTextAttributes: [NSObject : AnyObject] = [
NSForegroundColorAttributeName : UIColor.whiteColor(),
NSFontAttributeName : boldFont!,
]
self.setTitleTextAttributes(normalTextAttributes, forState: .Normal)
self.setTitleTextAttributes(normalTextAttributes, forState: .Highlighted)
self.setTitleTextAttributes(boldTextAttributes, forState: .Selected)
}
请确保在您的viewDidLoad中添加stylizeFonts（），或者如果您是子类，请添加为单独的函数。
Greg的Swift3答案已更新：
let attr = NSDictionary(object: UIFont(name: "OpenSans", size: 12.0)!, forKey: NSFontAttributeName as NSCopying)
UISegmentedControl.appearance().setTitleTextAttributes(attr as [NSObject : AnyObject] , for: .normal)
Swift 2.0
override func viewDidLayoutSubviews() {
let attributedSegmentFont = NSDictionary(object: UIFont(name: "Roboto-Regular", size: 14.0)!, forKey: NSFontAttributeName)
dashBoardSegment.setTitleTextAttributes(attributedSegmentFont as [NSObject : AnyObject], forState: .Normal)
}
更改所有段控件，使用：
UISegmentedControl.appearance().setTitleTextAttributes(attributedSegmentFont as [NSObject : AnyObject], forState: .Normal)
使用Swift扩展名：
extension UISegmentedControl{
func changeTitleFont(newFontName:String?, newFontSize:CGFloat?){
let attributedSegmentFont = NSDictionary(object: UIFont(name: newFontName!, size: newFontSize!)!, forKey: NSFontAttributeName)
setTitleTextAttributes(attributedSegmentFont as [NSObject : AnyObject], forState: .Normal)
}
}
实现扩展名：
override func viewDidLayoutSubviews() {
dashBoardSegment.changeTitleFont("Roboto-Regular", newFontSize: 14.0)
}
Swift3
override func viewDidLayoutSubviews() {
let attr = NSDictionary(object: UIFont(name: "Chalkduster", size: 14.0)!, forKey: NSFontAttributeName as NSCopying)
segmentedControl.setTitleTextAttributes(attr as [NSObject : AnyObject] , for: .normal)
}
通过扩展mvien出色的Swift方法。我创建了SegmentedControl扩展：
extension UISegmentedControl {
func setFontSize(fontSize: CGFloat) {
let normalTextAttributes: [NSObject : AnyObject] = [
NSForegroundColorAttributeName: UIColor.blackColor(),
NSFontAttributeName: UIFont.systemFontOfSize(fontSize, weight: UIFontWeightRegular)
]
let boldTextAttributes: [NSObject : AnyObject] = [
NSForegroundColorAttributeName : UIColor.whiteColor(),
NSFontAttributeName : UIFont.systemFontOfSize(fontSize, weight: UIFontWeightMedium),
]
self.setTitleTextAttributes(normalTextAttributes, forState: .Normal)
self.setTitleTextAttributes(normalTextAttributes, forState: .Highlighted)
self.setTitleTextAttributes(boldTextAttributes, forState: .Selected)
}
}
只需将上面的扩展代码添加到您的项目中，然后像这样使用：
yourSegmentedControl.setFontSize(20)
对于Swift 4
let font = UIFont.systemFont(ofSize: 16)
segmentedControl.setTitleTextAttributes([NSAttributedString.Key.font: font],
for: .normal)
使用@Alvin George的答案，因为我认为添加扩展名来操纵它（并针对Swift 4进行改进是一个好主意：
[创建像UISegmentedControl+Additions.swift这样的UISegmentedControl的扩展类
import Foundation
import UIKit
extension UISegmentedControl {
func font(name:String?, size:CGFloat?) {
let attributedSegmentFont = NSDictionary(object: UIFont(name: name!, size: size!)!, forKey: NSAttributedStringKey.font as NSCopying)
setTitleTextAttributes(attributedSegmentFont as [NSObject : AnyObject], for: .normal)
}
}
在您的代码中使用它：
segmentedControl?.font(name: "My Font Name", size: 12)