如何编辑 UIAlertAction 文本字体大小和颜色

Question

如何编辑UIAlertAction文字大小和颜色？我已经采取了UIAlertController acoording to it how to edit the size。这是我的代码

UIAlertController *controller = [UIAlertController alertControllerWithTitle:@"Do you wish to logout?" message:@"" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *logOut = [UIAlertAction actionWithTitle:@"Log Out" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {}];

现在我想要我的“注销”文本，字体大小为 22，绿色，半粗体。

Answer 1

您可以使用

更新文本颜色

       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。我建议你使用标准字体大小。

UIAlertAction 标题标签是私有变量，不能直接访问。标签位于 3 级私有视图层次结构中。使用更大的字体显示注销操作对应用程序有意义。

有很多开源解决方案可用。我会推荐尝试this

Answer 2

我写了一个扩展

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
        }

    }
}

Answer 3

以下是在 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")

或者你可以使用这个扩展：

extension UIAlertAction {
    var titleTextColor: UIColor? {
        get { return self.value(forKey: "titleTextColor") as? UIColor } 
        set { self.setValue(newValue, forKey: "titleTextColor") }
    }
}

Answer 4

更改颜色非常简单。

您可以只更改底层视图的 tintColor，但是，由于 iOS 9 中引入的一个已知错误 (https://openradar.appspot.com/22209332)，tintColor 会被应用程序窗口的 tintColor 覆盖。

查看我的完整回答： How to change tint color of UIAlertController

您不应该更改 UIAlertController 字体。不过还是可以的，见this answer

Answer 5

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"];

Answer 6

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) {}];

希望对你有帮助

Answer 7

这里给出我的答案 Swift 5。我们可以将自定义字体应用到 AlertView 和 AlertAddAction。
第一次创建 AlertView 扩展。内部扩展

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")
        }
    }
}



 

第二次调用那些 AlertView 函数在你需要的地方。例如调用 ViewDidLoad()

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)
    })
}

希望它适用于所有人?