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 < 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

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).

Answer 2

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()

Answer 3

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.

Answer 4

For iOS 9.0 and above use this code in app delegate

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