UIAlertController custom font size color

Question

I am using new UIAlertController for showing alerts  I have this code      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     Now I want to change title and message font  color  size and so  What s best way to do this   Edit  I should insert whole code  I created category for UIView that I could show right alert for iOS version    implementation UIView  AlertCompatibility      void  showSimpleAlertWithTitle   NSString    title                           message   NSString    message                 cancelButtonTitle   NSString    cancelButtonTitle       float iOSVersion     UIDevice currentDevice  systemVersion floatValue       if  iOSVersion  lt  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

User · Answer

There is a problem with setting the tint color on the view after presenting; even if you do it in the completion block of presentViewController:animated:completion:, it causes a flicker effect on the color of the button titles. This is sloppy, unprofessional and completely unacceptable.

Other solutions presented depend on the view hierarchy remaining static, something that Apple is loathe to do. Expect those solutions to fail in future releases of iOS.

The one sure-fire way to solve this problem and to do it everywhere, is via adding a category to UIAlertController and swizzling the viewWillAppear.

The header:

//
//  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

The implementation:

//
//  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

Add a .pch (precompiled header) to your project and include the category:

#import "UIAlertController+iOS9TintFix.h"

Make sure you register your pch in the project properly, and it will include the category methods in every class that uses the UIAlertController.

Then, in your app delegates didFinishLaunchingWithOptions method, import your category and call

[UIAlertController tintFix];

and it will automatically propagate to every single instance of UIAlertController within your app, whether launched by your code or anyone else's.

This solution works for both iOS 8.X and iOS 9.X and lacks the flicker of the tint change post-presentation approach. It is also completely agnostic with respect to the view hierarchy of the sub-views of the UIAlertController.

Happy hacking!

User · Answer

In Xcode 8 Swift 3 0    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       Output

User · Answer

You can change the button color by applying a tint color to an UIAlertController   On iOS 9  if the window tint color was set to a custom color  you have to apply the tint color right after presenting the alert  Otherwise the tint color will be reset to your custom window tint color      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

User · Answer

A bit clunky  but this works for me right now to set background and text colors  I found it here   UIView   firstView   alertController view subviews firstObject      UIView   nextView   firstView subviews firstObject      nextView backgroundColor    UIColor blackColor

User · Answer

In Swift 4 1 and Xcode 10    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 alert  animated  true

User · Answer

Not sure if this is against private APIs properties but using KVC works for me on ios8  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      For the record  it is possible to change alert action s font as well  using those private APIs  Again  it may get you app rejected  I have not yet tried to submit such code   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   For Swift 4 2 in XCode 10 and up the last 2 lines are now   guard let label    action  value forKey     representer  as  NSObject   value forKey   label   as  UILabel else   return           label attributedText   attributedText

User · Answer

You can use an external library like PMAlertController without using workaround  where you can substitute Apple s uncustomizable UIAlertController with a super customizable alert  Compatible with Xcode 8  Swift 3 and Objective-C   Features    x  Header View  x  Header Image  Optional   x  Title  x  Description message  x  Customizations  fonts  colors  dimensions  amp  more  x  1  2 buttons  horizontally  or 3  buttons  vertically   x  Closure when a button is pressed  x  Text Fields support  x  Similar implementation to UIAlertController  x  Cocoapods  x  Carthage  x  Animation with UIKit Dynamics  x  Objective-C compatibility  x  Swift 2 3  amp  Swift 3 support

User · Answer

I m using it     UIView appearanceWhenContainedIn  UIAlertController class   nil  setTintColor  UIColor blueColor      Add one line  AppDelegate  and works for all UIAlertController

User · Answer

I have created one method 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       Code wokring perfectly on Xcode 8 3 1  You can customise according to requirement

User · Answer

I just completed a replacement for UIAlertController  This is the only sensible way to go  I think     Old  Here s my method in Swift which mashes up a lot of information from answers here  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                      This works in some situations perfectly  and in others it s a total fail  the tint colors do not show as expected

User · Answer

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

User · Answer

A Swift translation of the  dupuis2387 answer  Worked out the syntax to set the UIAlertController title s color and font via KVC using the attributedTitle key   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      - gt  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

User · Answer

To change the color of one button like CANCEL to the red color you can use this style property called UIAlertActionStyle destructive    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

User · Answer

You can change color of button text using this code   alertC view tintColor   your color    Maybe this will help you

User · Answer

Use UIAppearance protocol  Example for setting a font - create a category to extend  UILabel    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   And its usage   UILabel   appearanceLabel    UILabel appearanceWhenContainedIn UIAlertController class  nil    appearanceLabel setAppearanceFont  UIFont boldSystemFontOfSize 10      for example   Tested and working with style UIAlertControllerStyleActionSheet  but I guess it will work with UIAlertControllerStyleAlert too   P S  Better check for class availability instead of iOS version   if   UIAlertController class            UIAlertController code  iOS 8    else          UIAlertView code  pre iOS 8

User · Answer

Swift 4   Example of custom font on the title  Same things for other components such as message or actions       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

User · Answer

Please find this category  I am able to change FONT and Color of UIAlertAction and UIAlertController    Use    UILabel   appearanceLabel    UILabel appearanceWhenContainedIn UIAlertController class  nil    appearanceLabel setAppearanceFont yourDesireFont

User · Answer

Here is an extension for Swift 4 1 and Xcode 9 4 1   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

User · Answer

I work for Urban Outfitters  We have an open source pod  URBNAlert  that we used in all of our apps  It s based off of UIAlertController  but is highly customizable   Source is here  https   github com urbn URBNAlert  Or simply install by the pod by placing URBNAlert in your Podfile  Heres some sample code   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

User · Answer

Use UIAppearance protocol  Do more hacks with appearanceFont to change font for UIAlertAction   Create a category for UILabel  UILabel FontAppearance h   interface UILabel  FontAppearance    property  nonatomic  copy  UIFont   appearanceFont UI APPEARANCE SELECTOR    end   UILabel FontAppearance m   implementation UILabel  FontAppearance   -  void setAppearanceFont  UIFont   font       if  self tag    1001            return             BOOL isBold    self font fontDescriptor symbolicTraits  amp  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   Usage   add    UILabel appearanceWhenContainedIn UIAlertController class  nil  setAppearanceFont nil     in AppDelegate m to make it work for all UIAlertController

User · Answer

Swift 5 and 5 1  Create a separate file and put UIAlertController Customization code there  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         Now On any action Show Alert    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        Result

User · Answer

For iOS 9 0 and above use this code in app delegate    UIView appearanceWhenContainedInInstancesOfClasses    UIAlertController class    setTintColor  UIColor redColor

User · Answer

I just use this kind of demand  seemingly and system  details are slightly different  so we are     OC realized Alert and Sheet popup window encapsulation   Often encountered in daily development need to add a figure to Alert or change a button color  such as  simple  demand  today brings a and system components of highly similar and can fully meet the demand of customized packaging components   Github https   github com ReverseScale RSCustomAlertView

User · Answer

You can use the following syntax without any private API  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

User · Answer

Solution 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

[ios] UIAlertController custom font, size, color

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