Question

我正在使用新的UIAlertController来显示警报。我有这段代码：

// nil titles break alert interface on iOS 8.0, so we'll be using empty strings
UIAlertController *alert = [UIAlertController alertControllerWithTitle: title == nil ? @"": title message: message preferredStyle: UIAlertControllerStyleAlert];


UIAlertAction *defaultAction = [UIAlertAction actionWithTitle: cancelButtonTitle style: UIAlertActionStyleCancel handler: nil];

[alert addAction: defaultAction];

UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
[rootViewController presentViewController:alert animated:YES completion:nil];

现在我想更改标题和消息字体，颜色，大小等。什么是最好的方法呢？

修改我应该插入整个代码。我为UIView创建了一个类别，我可以为iOS版本显示正确的警报。

@implementation UIView (AlertCompatibility)

+( void )showSimpleAlertWithTitle:( NSString * )title
                          message:( NSString * )message
                cancelButtonTitle:( NSString * )cancelButtonTitle
{
    float iOSVersion = [[UIDevice currentDevice].systemVersion floatValue];
    if (iOSVersion < 8.0f)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle: title
                                                        message: message
                                                       delegate: nil
                                              cancelButtonTitle: cancelButtonTitle
                                              otherButtonTitles: nil];
        [alert show];
    }
    else
    {
        // nil titles break alert interface on iOS 8.0, so we'll be using empty strings
        UIAlertController *alert = [UIAlertController alertControllerWithTitle: title == nil ? @"": title
                                                                       message: message
                                                                preferredStyle: UIAlertControllerStyleAlert];


        UIAlertAction *defaultAction = [UIAlertAction actionWithTitle: cancelButtonTitle
                                                                style: UIAlertActionStyleCancel
                                                              handler: nil];

        [alert addAction: defaultAction];

        UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
        [rootViewController presentViewController:alert animated:YES completion:nil];
    }
}

Answer 1

不确定这是针对私有API /属性，还是使用KVC在ios8上为我工作

UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"Dont care what goes here, since we're about to change below" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@"Presenting the great... Hulk Hogan!"];
[hogan addAttribute:NSFontAttributeName
              value:[UIFont systemFontOfSize:50.0]
              range:NSMakeRange(24, 11)];
[alertVC setValue:hogan forKey:@"attributedTitle"];



UIAlertAction *button = [UIAlertAction actionWithTitle:@"Label text" 
                                        style:UIAlertActionStyleDefault
                                        handler:^(UIAlertAction *action){
                                                    //add code to make something happen once tapped
}];
UIImage *accessoryImage = [UIImage imageNamed:@"someImage"];
[button setValue:accessoryImage forKey:@"image"];

对于记录，也可以使用这些私有API更改警报操作的字体。同样，它可能会让你的应用被拒绝，我还没有尝试过提交这样的代码。

let alert = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)

let action = UIAlertAction(title: "Some title", style: .Default, handler: nil)
let attributedText = NSMutableAttributedString(string: "Some title")

let range = NSRange(location: 0, length: attributedText.length)
attributedText.addAttribute(NSKernAttributeName, value: 1.5, range: range)
attributedText.addAttribute(NSFontAttributeName, value: UIFont(name: "ProximaNova-Semibold", size: 20.0)!, range: range)

alert.addAction(action)

presentViewController(alert, animated: true, completion: nil)

// this has to be set after presenting the alert, otherwise the internal property __representer is nil
guard let label = action.valueForKey("__representer")?.valueForKey("label") as? UILabel else { return }
label.attributedText = attributedText

对于XCode 10及更高版本中的Swift 4.2，最后两行现在是：

guard let label = (action!.value(forKey: "__representer")as? NSObject)?.value(forKey: "label") as? UILabel else { return }
        label.attributedText = attributedText

Answer 2

您可以通过将色调应用于UIAlertController来更改按钮颜色。

在iOS 9上，如果窗口色调颜色设置为自定义颜色，则必须在显示警报后立即应用色调颜色。否则，色调颜色将重置为您的自定义窗口色调。

// In your AppDelegate for example:
window?.tintColor = UIColor.redColor()

// Elsewhere in the App:
let alertVC = UIAlertController(title: "Title", message: "message", preferredStyle: .Alert)
alertVC.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))
alertVC.addAction(UIAlertAction(title: "Ok", style: .Default, handler: nil))

// Works on iOS 8, but not on iOS 9
// On iOS 9 the button color will be red
alertVC.view.tintColor = UIColor.greenColor()

self.presentViewController(alert, animated: true, completion: nil)

// Necessary to apply tint on iOS 9
alertVC.view.tintColor = UIColor.greenColor()

Answer 3

您可以使用以下代码更改按钮文字的颜色：

alertC.view.tintColor = your color;

也许这会对你有帮助。

Answer 4

在Xcode 8 Swift 3.0中

@IBAction func touchUpInside(_ sender: UIButton) {

    let alertController = UIAlertController(title: "", message: "", preferredStyle: .alert)

    //to change font of title and message.
    let titleFont = [NSFontAttributeName: UIFont(name: "ArialHebrew-Bold", size: 18.0)!]
    let messageFont = [NSFontAttributeName: UIFont(name: "Avenir-Roman", size: 12.0)!]

    let titleAttrString = NSMutableAttributedString(string: "Title Here", attributes: titleFont)
    let messageAttrString = NSMutableAttributedString(string: "Message Here", attributes: messageFont)

    alertController.setValue(titleAttrString, forKey: "attributedTitle")
    alertController.setValue(messageAttrString, forKey: "attributedMessage")

    let action1 = UIAlertAction(title: "Action 1", style: .default) { (action) in
        print("\(action.title)")
    }

    let action2 = UIAlertAction(title: "Action 2", style: .default) { (action) in
        print("\(action.title)")
    }

    let action3 = UIAlertAction(title: "Action 3", style: .default) { (action) in
        print("\(action.title)")
    }

    let okAction = UIAlertAction(title: "Ok", style: .default) { (action) in
        print("\(action.title)")
    }

    alertController.addAction(action1)
    alertController.addAction(action2)
    alertController.addAction(action3)
    alertController.addAction(okAction)

    alertController.view.tintColor = UIColor.blue
    alertController.view.backgroundColor = UIColor.black
    alertController.view.layer.cornerRadius = 40

    present(alertController, animated: true, completion: nil)

}

<强> 输出

Answer 5

@ dupuis2387答案的Swift翻译。制定了语法，使用UIAlertController键通过KVC设置attributedTitle标题的颜色和字体。

let message = "Some message goes here."
let alertController = UIAlertController(
    title: "", // This gets overridden below.
    message: message,
    preferredStyle: .Alert
)
let okAction = UIAlertAction(title: "OK", style: .Cancel) { _ -> Void in
}
alertController.addAction(okAction)

let fontAwesomeHeart = "\u{f004}"
let fontAwesomeFont = UIFont(name: "FontAwesome", size: 17)!
let customTitle:NSString = "I \(fontAwesomeHeart) Swift" // Use NSString, which lets you call rangeOfString()
let systemBoldAttributes:[String : AnyObject] = [ 
    // setting the attributed title wipes out the default bold font,
    // so we need to reconstruct it.
    NSFontAttributeName : UIFont.boldSystemFontOfSize(17)
]
let attributedString = NSMutableAttributedString(string: customTitle as String, attributes:systemBoldAttributes)
let fontAwesomeAttributes = [
    NSFontAttributeName: fontAwesomeFont,
    NSForegroundColorAttributeName : UIColor.redColor()
]
let matchRange = customTitle.rangeOfString(fontAwesomeHeart)
attributedString.addAttributes(fontAwesomeAttributes, range: matchRange)
alertController.setValue(attributedString, forKey: "attributedTitle")

self.presentViewController(alertController, animated: true, completion: nil)

Answer 6

使用UIAppearance协议。设置字体的示例 - 创建扩展UILabel的类别：

@interface UILabel (FontAppearance)
@property (nonatomic, copy) UIFont * appearanceFont UI_APPEARANCE_SELECTOR;
@end


@implementation UILabel (FontAppearance)

-(void)setAppearanceFont:(UIFont *)font {
    if (font)
        [self setFont:font];
}

-(UIFont *)appearanceFont {
    return self.font;
}

@end

及其用法：

UILabel * appearanceLabel = [UILabel appearanceWhenContainedIn:UIAlertController.class, nil];
[appearanceLabel setAppearanceFont:[UIFont boldSystemFontOfSize:10]]; //for example

使用样式UIAlertControllerStyleActionSheet进行测试和处理，但我想它也适用于UIAlertControllerStyleAlert。

P.S。更好地检查类可用性而不是iOS版本：

if ([UIAlertController class]) {
    // UIAlertController code (iOS 8)
} else {
    // UIAlertView code (pre iOS 8)
}

Answer 7

使用UIAppearance协议。使用appearanceFont执行更多操作以更改UIAlertAction的字体。

为UILabel

创建一个类别

的UILabel + FontAppearance.h

@interface UILabel (FontAppearance)

@property (nonatomic, copy) UIFont * appearanceFont UI_APPEARANCE_SELECTOR;

@end

的UILabel + FontAppearance.m

@implementation UILabel (FontAppearance)

- (void)setAppearanceFont:(UIFont *)font
{
    if (self.tag == 1001) {
        return;
    }

    BOOL isBold = (self.font.fontDescriptor.symbolicTraits & UIFontDescriptorTraitBold);
    const CGFloat* colors = CGColorGetComponents(self.textColor.CGColor);

    if (self.font.pointSize == 14) {
        // set font for UIAlertController title
        self.font = [UIFont systemFontOfSize:11];
    } else if (self.font.pointSize == 13) {
        // set font for UIAlertController message
        self.font = [UIFont systemFontOfSize:11];
    } else if (isBold) {
        // set font for UIAlertAction with UIAlertActionStyleCancel
        self.font = [UIFont systemFontOfSize:12];
    } else if ((*colors) == 1) {
        // set font for UIAlertAction with UIAlertActionStyleDestructive
        self.font = [UIFont systemFontOfSize:13];
    } else {
        // set font for UIAlertAction with UIAlertActionStyleDefault
        self.font = [UIFont systemFontOfSize:14];
    }
    self.tag = 1001;
}

- (UIFont *)appearanceFont
{
    return self.font;
}

@end

用法：

添加

[[UILabel appearanceWhenContainedIn:UIAlertController.class, nil] setAppearanceFont:nil];

AppDelegate.m中的

使其适用于所有UIAlertController。

Answer 8

我正在使用它。

[[UIView appearanceWhenContainedIn:[UIAlertController class], nil] setTintColor:[UIColor blueColor]];

添加一行（AppDelegate）并适用于所有UIAlertController。

Answer 9

Swift 4

标题上的自定义字体示例。其他组件也是如此，例如消息或操作。

    let titleAttributed = NSMutableAttributedString(
            string: Constant.Strings.cancelAbsence, 
            attributes: [NSAttributedStringKey.font:UIFont(name:"FONT_NAME",size: FONT_SIZE)]
    )

    let alertController = UIAlertController(
        title: "",
        message: "",
        preferredStyle: UIAlertControllerStyle.YOUR_STYLE
    )

    alertController.setValue(titleAttributed, forKey : "attributedTitle")
    present(alertController, animated: true, completion: nil)

Answer 10

这是Swift 4.1和Xcode 9.4.1的扩展：

extension UIAlertController{

func addColorInTitleAndMessage(color:UIColor,titleFontSize:CGFloat = 18, messageFontSize:CGFloat = 13){

    let attributesTitle = [NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: titleFontSize)]
    let attributesMessage = [NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.font: UIFont.systemFont(ofSize: messageFontSize)]
    let attributedTitleText = NSAttributedString(string: self.title ?? "", attributes: attributesTitle)
    let attributedMessageText = NSAttributedString(string: self.message ?? "", attributes: attributesMessage)

    self.setValue(attributedTitleText, forKey: "attributedTitle")
    self.setValue(attributedMessageText, forKey: "attributedMessage")

}}

Answer 11

您可以使用PMAlertController之类的外部库，而无需使用解决方法，您可以使用超级自定义警报替换Apple的无法自定义的UIAlertController。

与Xcode 8，Swift 3和Objective-C兼容

特点：

[x]标题视图
[x]标题图片（可选）
[x]标题
[x]说明消息
[x]自定义：字体，颜色，尺寸和尺寸更
[x] 1,2个按钮（水平）或3个按钮（垂直）
[x]按下按钮时关闭
[x]文字字段支持
[x]与UIAlertController类似的实现
[x] Cocoapods
[x]迦太基
[x]使用UIKit Dynamics进行动画
[x] Objective-C兼容性
[x] Swift 2.3＆amp; Swift 3支持

Answer 12

在呈现后在视图上设置色调颜色存在问题;即使你在presentViewController：animated：completion：的完成块中执行它，它也会对按钮标题的颜色产生闪烁效果。这是草率的，不专业的，完全不可接受的。

呈现的其他解决方案取决于视图层次结构保持静态，这是Apple不愿意做的事情。预计这些解决方案将在未来的iOS版本中失败。

通过向UIAlertController添加一个类别并调整viewWillAppear来解决此问题并在任何地方实现这一目标的一种确定方法。

标题：

//
//  UIAlertController+iOS9TintFix.h
//
//  Created by Flor, Daniel J on 11/2/15.
//

#import <UIKit/UIKit.h>

@interface UIAlertController (iOS9TintFix)

+ (void)tintFix;

- (void)swizzledViewWillAppear:(BOOL)animated;

@end

实施：

//
//  UIAlertController+iOS9TintFix.m
//
//  Created by Flor, Daniel J on 11/2/15.
//

#import "UIAlertController+iOS9TintFix.h"
#import <objc/runtime.h>

@implementation UIAlertController (iOS9TintFix)

+ (void)tintFix {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Method method  = class_getInstanceMethod(self, @selector(viewWillAppear:));
        Method swizzle = class_getInstanceMethod(self, @selector(swizzledViewWillAppear:));
        method_exchangeImplementations(method, swizzle);});
}

- (void)swizzledViewWillAppear:(BOOL)animated {
    [self swizzledViewWillAppear:animated];
    for (UIView *view in self.view.subviews) {
        if (view.tintColor == self.view.tintColor) {
            //only do those that match the main view, so we don't strip the red-tint from destructive buttons.
            self.view.tintColor = [UIColor colorWithRed:0.0 green:122.0/255.0 blue:1.0 alpha:1.0];
            [view setNeedsDisplay];
        }
    }
}

@end

将.pch（预编译头）添加到项目中并包含以下类别：

#import "UIAlertController+iOS9TintFix.h"

确保在项目中正确注册pch，并且它将在每个使用UIAlertController的类中包含类别方法。

然后，在你的app中委托didFinishLaunchingWithOptions方法，导入你的类别并调用

[UIAlertController tintFix];

它将自动传播到您应用中的每个UIAlertController实例，无论是由您的代码还是其他任何人启动。

此解决方案适用于iOS 8.X和iOS 9.X，并且缺少色彩更改后呈现方式的闪烁。对于UIAlertController的子视图的视图层次结构，它也是完全不可知的。

快乐的黑客攻击！

Answer 13

我刚刚完成UIAlertController的替换。我认为This是唯一明智的选择：

旧

这是我在Swift中的方法，它从这里的答案中汲取了大量信息

func changeAlert(alert: UIAlertController, backgroundColor: UIColor, textColor: UIColor, buttonColor: UIColor?) {
    let view = alert.view.firstSubview().firstSubview()
    view.backgroundColor = backgroundColor
    view.layer.cornerRadius = 10.0

    // set color to UILabel font
    setSubviewLabelsToTextColor(textColor, view: view)

    // set font to alert via KVC, otherwise it'll get overwritten
    let titleAttributed = NSMutableAttributedString(
        string: alert.title!,
        attributes: [NSFontAttributeName:UIFont.boldSystemFontOfSize(17)])
    alert.setValue(titleAttributed, forKey: "attributedTitle")


    let messageAttributed = NSMutableAttributedString(
        string: alert.message!,
        attributes: [NSFontAttributeName:UIFont.systemFontOfSize(13)])
    alert.setValue(messageAttributed, forKey: "attributedMessage")


    // set the buttons to non-blue, if we have buttons
    if let buttonColor = buttonColor {
        alert.view.tintColor = buttonColor
    }
}

func setSubviewLabelsToTextColor(textColor: UIColor, view:UIView) {
    for subview in view.subviews {
        if let label = subview as? UILabel {
            label.textColor = textColor
        } else {
            setSubviewLabelsToTextColor(textColor, view: subview)
        }
    }
}

这在某些情况下非常有效，而在其他情况下则完全失败（色调颜色未按预期显示）。

Answer 14

请查看this类别。我能够改变UIAlertAction和UIAlertController的FONT和Color。

使用：

UILabel * appearanceLabel = [UILabel appearanceWhenContainedIn:UIAlertController.class, nil];
[appearanceLabel setAppearanceFont:yourDesireFont]];

Answer 15

解决方案/ Hack for iOS9

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Test Error" message:@"This is a test" preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        NSLog(@"Alert View Displayed");
 [[[[UIApplication sharedApplication] delegate] window] setTintColor:[UIColor whiteColor]];
    }];

    [alertController addAction:cancelAction];
    [[[[UIApplication sharedApplication] delegate] window] setTintColor:[UIColor blackColor]];
    [self presentViewController:alertController animated:YES completion:^{
        NSLog(@"View Controller Displayed");
    }];

Answer 16

要将一个按钮（如CANCEL）的颜色更改为红色，您可以使用名为UIAlertActionStyle.destructive的此样式属性：

let prompt = UIAlertController.init(title: "Reset Password", message: "Enter Your E-mail :", preferredStyle: .alert)
        let okAction = UIAlertAction.init(title: "Submit", style: .default) { (action) in
              //your code
}

let cancelAction = UIAlertAction.init(title: "Cancel", style: UIAlertActionStyle.destructive) { (action) in
                //your code
        }
        prompt.addTextField(configurationHandler: nil)
        prompt.addAction(okAction)
        prompt.addAction(cancelAction)
        present(prompt, animated: true, completion: nil);

Answer 17

我为Urban Outfitters工作。我们在所有应用中都使用了一个开源pod URBNAlert。它基于UIAlertController，但可高度自定义。

来源在这里：https://github.com/urbn/URBNAlert

或者只需将URBNAlert放入您的Podfile

即可通过pod进行安装

下面是一些示例代码：

URBNAlertViewController *uac = [[URBNAlertViewController alloc] initWithTitle:@"The Title of my message can be up to 2 lines long. It wraps and centers." message:@"And the message that is a bunch of text. And the message that is a bunch of text. And the message that is a bunch of text."];

// You can customize style elements per alert as well. These will override the global style just for this alert.
uac.alertStyler.blurTintColor = [[UIColor orangeColor] colorWithAlphaComponent:0.4];
uac.alertStyler.backgroundColor = [UIColor orangeColor];
uac.alertStyler.textFieldEdgeInsets = UIEdgeInsetsMake(0.0, 15.0, 0.0, 15.0);
uac.alertStyler.titleColor = [UIColor purpleColor];
uac.alertStyler.titleFont = [UIFont fontWithName:@"Chalkduster" size:30];
uac.alertStyler.messageColor = [UIColor blackColor];
uac.alertStyler.alertMinWidth = @150;
uac.alertStyler.alertMaxWidth = @200;
// many more styling options available 

[uac addAction:[URBNAlertAction actionWithTitle:@"Ok" actionType:URBNAlertActionTypeNormal actionCompleted:^(URBNAlertAction *action) {
      // Do something
}]];

[uac addAction:[URBNAlertAction actionWithTitle:@"Cancel" actionType:URBNAlertActionTypeCancel actionCompleted:^(URBNAlertAction *action) {
      // Do something
}]];

[uac show];

Answer 18

在Swift 4.1和Xcode 10中

//Displaying alert with multiple actions and custom font ans size
let alert = UIAlertController(title: "", message: "", preferredStyle: .alert)

let titFont = [NSAttributedStringKey.font: UIFont(name: "ArialHebrew-Bold", size: 15.0)!]
let msgFont = [NSAttributedStringKey.font: UIFont(name: "Avenir-Roman", size: 13.0)!]

let titAttrString = NSMutableAttributedString(string: "Title Here", attributes: titFont)
let msgAttrString = NSMutableAttributedString(string: "Message Here", attributes: msgFont)

alert.setValue(titAttrString, forKey: "attributedTitle")
alert.setValue(msgAttrString, forKey: "attributedMessage")

let action1 = UIAlertAction(title: "Action 1", style: .default) { (action) in
    print("\(String(describing: action.title))")
}

let action2 = UIAlertAction(title: "Action 2", style: .default) { (action) in
    print("\(String(describing: action.title))")
}

let okAction = UIAlertAction(title: "Ok", style: .default) { (action) in
    print("\(String(describing: action.title))")
}
alert.addAction(action1)
alert.addAction(action2)
alert.addAction(okAction)

alert.view.tintColor = UIColor.blue
alert.view.layer.cornerRadius = 40
// //If required background colour 
// alert.view.backgroundColor = UIColor.white

DispatchQueue.main.async(execute: {
    self.present(alertController, animated: true)
})

Answer 19

Swift 5.0

let titleAttrString = NSMutableAttributedString(string: "This is a title", attributes: [NSAttributedString.Key.font: UIFont(name: "CustomFontName", size: 17) as Any])
let messageAttrString = NSMutableAttributedString(string: "This is a message", attributes: [NSAttributedString.Key.font: UIFont(name: "CustomFontName", size: 13) as Any])

alertController.setValue(titleAttrString, forKey: "attributedTitle")
alertController.setValue(messageAttrString, forKey: "attributedMessage")

Answer 20

我创建了一个方法Objective-C

-(void)customAlertTitle:(NSString*)title message:(NSString*)message{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil message:nil delegate:nil cancelButtonTitle:@"NO" otherButtonTitles:@"YES", nil];
UIView *subView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 80)];

UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 270, 50)];
titleLabel.text = title;
titleLabel.font = [UIFont boldSystemFontOfSize:20];
titleLabel.numberOfLines = 2;
titleLabel.textColor = [UIColor redColor];
titleLabel.textAlignment = NSTextAlignmentCenter;

[subView addSubview:titleLabel];

UILabel *messageLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 30, 270, 50)];
messageLabel.text = message;
messageLabel.font = [UIFont systemFontOfSize:18];
messageLabel.numberOfLines = 2;
messageLabel.textColor = [UIColor redColor];
messageLabel.textAlignment = NSTextAlignmentCenter;

[subView addSubview:messageLabel];

[alertView setValue:subView forKey:@"accessoryView"];
[alertView show];
}

代码在Xcode 8.3.1上完美地运行。您可以根据需要进行定制。

Answer 21

我只是使用这种需求，看似和系统，细节略有不同，所以我们...... OC实现了Alert和Sheet弹出窗口封装。

在日常开发中经常遇到需要为Alert添加数字或更改按钮颜色，如“简单”需求，今天带来的和系统组件高度相似，可以完全满足定制包装组件的需求。

Github上：https://github.com/ReverseScale/RSCustomAlertView

Answer 22

对于iOS 9.0及更高版本，请在app delegate

中使用此代码

[[UIView appearanceWhenContainedInInstancesOfClasses:@[[UIAlertController class]]] setTintColor:[UIColor redColor]];

Answer 23

有点笨重，但这对我来说现在可以设置背景和文字颜色。我找到了here。

func viewWillLayoutSubviews() {
    self.firstSubview.frame = CGRectMake(x, y, w, h)
    self.secondSubview.frame = CGRectMake(x, z, w, h)
}

Answer 24

快速5.创建一个单独的文件，并将UIAlertController自定义代码放在其中

import Foundation
import  UIKit

extension UIAlertController {

  //Set background color of UIAlertController
  func setBackgroudColor(color: UIColor) {
    if let bgView = self.view.subviews.first,
      let groupView = bgView.subviews.first,
      let contentView = groupView.subviews.first {
      contentView.backgroundColor = color
    }
  }

  //Set title font and title color
  func setTitle(font: UIFont?, color: UIColor?) {
    guard let title = self.title else { return }
    let attributeString = NSMutableAttributedString(string: title)//1
    if let titleFont = font {
      attributeString.addAttributes([NSAttributedString.Key.font : titleFont],//2
        range: NSMakeRange(0, title.utf8.count))
    }
    if let titleColor = color {
      attributeString.addAttributes([NSAttributedString.Key.foregroundColor : titleColor],//3
        range: NSMakeRange(0, title.utf8.count))
    }
    self.setValue(attributeString, forKey: "attributedTitle")//4
  }

  //Set message font and message color
  func setMessage(font: UIFont?, color: UIColor?) {
    guard let title = self.message else {
      return
    }
    let attributedString = NSMutableAttributedString(string: title)
    if let titleFont = font {
      attributedString.addAttributes([NSAttributedString.Key.font : titleFont], range: NSMakeRange(0, title.utf8.count))
    }
    if let titleColor = color {
      attributedString.addAttributes([NSAttributedString.Key.foregroundColor : titleColor], range: NSMakeRange(0, title.utf8.count))
    }
    self.setValue(attributedString, forKey: "attributedMessage")//4
  }

  //Set tint color of UIAlertController
  func setTint(color: UIColor) {
    self.view.tintColor = color
  }
}

现在对任何操作显示警报

  func tapShowAlert(sender: UIButton) {
    let alertController = UIAlertController(title: "Alert!!", message: "This is custom alert message", preferredStyle: .alert)
    // Change font and color of title
    alertController.setTitle(font: UIFont.boldSystemFont(ofSize: 26), color: UIColor.yellow)
    // Change font and color of message
    alertController.setMessage(font: UIFont(name: "AvenirNextCondensed-HeavyItalic", size: 18), color: UIColor.red)
    // Change background color of UIAlertController
    alertController.setBackgroudColor(color: UIColor.black)
    let actnOk = UIAlertAction(title: "Ok", style: .default, handler: nil)
    let actnCancel = UIAlertAction(title: "Cancel", style: .default, handler: nil)
    alertController.addAction(actnOk)
    alertController.addAction(actnCancel)
    self.present(alertController, animated: true, completion: nil)
  }

结果

Answer 25

您可以在不使用任何私有API的情况下使用以下语法。

alert.view.tintColor = alert.view.tintColor = UIColor.green
alert.setTitle(font: UIFont.boldSystemFont(ofSize: 26), color: UIColor.darkGray)
alert.setMessage(font: UIFont.systemFont(ofSize: 26), color: UIColor.darkGray)

UIAlertController自定义字体，大小，颜色

25 个答案:

特点：

旧