如何在iOS 8中通过外观代理设置UIButton字体? [英] How to set UIButton font via appearance proxy in iOS 8?
问题描述
我试图通过外观代理设置UIButton
的字体.但这似乎不起作用.这就是我尝试过的.
I tried to set the font of UIButton
via appearance proxy. But it doesn't seem to work. This is what I tried.
UIButton.appearance().titleFont = UIFont(name: FONT_NAME_DEFAULT, size:20.0)
UIButton.appearance().titleLabel?.font = UIFont(name: FONT_NAME_DEFAULT, size:20.0)
如何在iOS 8中通过外观代理设置UIButton
字体?
How to set UIButton
font via appearance proxy in iOS 8 ?
EDIT: Found in vaberer's link: "I'm surprised that UIButton doesn't have any UI_APPEARANCE_SELECTOR properties, yet conforms to the UIAppearance protocol."
推荐答案
具有主题主题的应用程序也存在同样的问题.
Had the same problem with a theme-able app.
// UIButton+TitleLabelFont.swift
import UIKit
extension UIButton {
var titleLabelFont: UIFont! {
get { return self.titleLabel?.font }
set { self.titleLabel?.font = newValue }
}
}
2.然后设置UIButton
外观原型对象
2. Then setup the UIButton
appearance prototype object
class Theme {
static func apply() {
applyToUIButton()
// ...
}
// It can either theme a specific UIButton instance, or defaults to the appearance proxy (prototype object) by default
static func applyToUIButton(a: UIButton = UIButton.appearance()) {
a.titleLabelFont = UIFont(name: FONT_NAME_DEFAULT, size:20.0)
// other UIButton customizations
}
}
3.将主题设置拖放到应用程序委托中
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
Theme.apply()
// ...
return true
}
如果您较早地预加载了内容(情节提要中的lazy var
VC),那么最好不使用应用程序委托在覆盖初始化程序中设置主题内容,如下所示:
If you're preloading stuff (lazy var
VCs from storyboards) earlier, it may be better to instead of using app delegate setup the theme stuff in an override initializer like so:
private var _NSObject__Theme_apply_token: dispatch_once_t = 0
extension NSObject {
override public class func initialize() {
super.initialize()
// see also: https://stackoverflow.com/questions/19176219/why-am-i-getting-deadlock-with-dispatch-once
var shouldRun = false
dispatch_once(&_NSObject__Theme_apply_token) {
shouldRun = true
}
if shouldRun {
Theme.apply()
}
}
}
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