如何修改UIAlertAction文字大小和颜色？我已经根据它UIAlertController如何编辑大小。这个我的代码
UIAlertController *controller = [UIAlertController alertControllerWithTitle:@"Do you wish to logout?" message:@"" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *logOut = [UIAlertAction actionWithTitle:@"Log Out" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {}];
现在我希望我的'Log Out'文本字体大小为22，绿色和半文字。
答案 0 :(得分：37)
您可以使用
更新文字颜色 UIAlertAction *myGoalAction = [UIAlertAction
actionWithTitle:NSLocalizedString(@"My Title", @"My Title")
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action)
{
}];
[myGoalAction setValue:[UIColor greenColor] forKey:@"titleTextColor"];
没有有效的方法来更新字体大小。我建议您使用标准字体大小。
UIAlertAction标题标签是私有变量，无法直接访问。标签位于3级私有视图层次结构中。显示更大字体的注销操作对app有意义。
有许多开源解决方案可供使用。我建议您尝试this
答案 1 :(得分：3)
我写了一个扩展名
extension UIAlertController{
open override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
for i in self.actions {
let attributedText = NSAttributedString(string: i.title ?? "", attributes: [NSAttributedString.Key.font : UIFont(name: "SFProText-Semibold", size: 20.0)!])
guard let label = (i.value(forKey: "__representer") as AnyObject).value(forKey: "label") as? UILabel else { return }
label.attributedText = attributedText
}
}
}
答案 2 :(得分：2)
这是在Swift中更改文本颜色的解决方案：
let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
action.setValue(UIColor.black, forKey: "titleTextColor")
或者您可以使用此扩展名：
extension UIAlertAction {
var titleTextColor: UIColor? {
get { return self.value(forKey: "titleTextColor") as? UIColor }
set { self.setValue(newValue, forKey: "titleTextColor") }
}
}
答案 3 :(得分：1)
更改颜色非常简单。
您可以更改基础视图的tintColor，但是，由于iOS 9（https://openradar.appspot.com/22209332）中引入的已知错误，tintColor被应用程序窗口的tintColor覆盖。
请参阅我的完整答案： How to change tint color of UIAlertController
您不应该更改UIAlertController字体。但是仍然可以完成，请参阅this answer
答案 4 :(得分：0)
在这里给出我的答案 Swift 5 。我们可以将自定义字体应用于 AlertView 和 AlertAddAction 。
第一个创建AlertView扩展名。内部扩展程序
import Foundation
import UIKit
extension UIAlertController {
func applyBranding() {
applyAlertTitleBranding()
applyAlertMessageBranding()
}
func applyAlertTitleBranding() {
let titleFont = [kCTFontAttributeName: UIFont(name: "Montserrat-Medium", size: 18.0)!]
let titleAttrString = NSMutableAttributedString(string: title!, attributes: titleFont as [NSAttributedString.Key : Any])
let titleColor = UIColor(red: 34.0/255/0, green: 34.0/255/0, blue: 34.0/255/0, alpha: 1.0)
titleAttrString.addAttribute(NSAttributedString.Key.foregroundColor,
value: titleColor,
range: NSRange(location: 0, length: title!.count))
setValue(titleAttrString, forKey: "attributedTitle")
}
func applyAlertMessageBranding() {
let messageFont = [kCTFontAttributeName: UIFont(name: "Montserrat-Regular", size: 14.0)!]
let messageAttrString = NSMutableAttributedString(string: message!, attributes: messageFont as [NSAttributedString.Key : Any])
let messageTitleColor = UIColor(red: 68.0/255/0, green: 68.0/255/0, blue: 68.0/255/0, alpha: 1.0)
messageAttrString.addAttribute(NSAttributedString.Key.foregroundColor,
value: messageTitleColor,
range: NSRange(location: 0, length: message!.count))
setValue(messageAttrString, forKey: "attributedMessage")
}
func applyNoActionBranding() {
let font = [kCTFontAttributeName: UIFont(name: "Montserrat-Medium", size: 16.0)!]
for actionButton in actions {
let titleAttrString = NSMutableAttributedString(string: actionButton.title!, attributes: font as [NSAttributedString.Key : Any])
actionButton.setValue(titleAttrString, forKey: "attributedTitleForAction")
}
}
func applyYesActionBranding() {
let font = [kCTFontAttributeName: UIFont(name: "Montserrat-Regular", size: 16.0)!]
for actionButton in actions {
let titleAttrString = NSMutableAttributedString(string: actionButton.title!, attributes: font as [NSAttributedString.Key : Any])
actionButton.setValue(titleAttrString, forKey: "attributedTitleForAction")
}
}
}
2nd在需要的地方调用这些AlertView函数。例如在ViewDidLoad（）
中调用override func viewDidLoad() {
super.viewDidLoad()
showAlert()
}
func showAlert() {
let alertVc = UIAlertController(title: "Some Title", message: "Some message", preferredStyle: .alert)
//No action
let noAction = UIAlertAction(title: "No", style: .default, handler: {
(alert: UIAlertAction!) -> Void in
alertVc.dismiss(animated: true, completion: nil)
})
//Yes action
let yesAction = UIAlertAction(title: "Yes", style: .default, handler: {
(alert: UIAlertAction!) -> Void in
self.deleteFunction(address)
alertVc.dismiss(animated: true, completion: nil)
})
alertVc.applyBranding()
alertVc.applyNoActionBranding()
alertVc.applyYesActionBranding()
alertVc.addAction(noAction)
alertVc.addAction(yesAction)
alertVc.view.tintColor = .blue
DispatchQueue.main.async(execute: {
self.present(alertVc, animated: true, completion: nil)
})
}
希望对所有人都有用
答案 5 :(得分：-1)
使用NSMutableAttributedString设置字体大小和颜色，使用下面的代码，
UIAlertController *controller = [UIAlertController alertControllerWithTitle:@"Do you wish to logout?" message:@"" preferredStyle:UIAlertControllerStyleAlert];
NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@"Do you wish to logout?"];
[hogan addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:50.0] range:NSMakeRange(24, 11)];
[hogan addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,35)];
[controller setValue:hogan forKey:@"attributedTitle"];
UIAlertAction *logOut = [UIAlertAction actionWithTitle:@"Log Out" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {}];
希望它有用
答案 6 :(得分：-1)
试试这个：
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Do you wish to logout?" message:@"abcd" preferredStyle:UIAlertControllerStyleActionSheet];
NSMutableAttributedString *xyz = [[NSMutableAttributedString alloc] initWithString:@"pqrs"];
[xyz addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:30.0]
range:NSMakeRange(20, 15)];
[alert setValue:xyz forKey:@"attributedTitle"];
UIAlertAction *logout = [UIAlertAction actionWithTitle:@"logout"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action){
//your code for handling this
}];
UIImage *Image = [UIImage imageNamed:@"yourImage"];
[logout setValue:accessoryImage forKey:@"image"];