Change Text Color of Items in UIActionSheet - iOS 8

问题

I had been using following code to change text color of items which I add in UIActionSheet.:

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet {
    for (UIView *subview in actionSheet.subviews) {
        if ([subview isKindOfClass:[UIButton class]]) {
            UIButton *button = (UIButton *)subview;
            [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        }
    }
}

It works fine in iOS7, but in iOS8 the above code doesn't change the text color of items.

Now my question is how to change the text color of items which I add in UIActionSheet using iOS8??

Additional Info:
I added breakpoint to see whether following lines from the above code get executed or not:

UIButton *button = (UIButton *)subview;
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

These lines do not get executed. So, if([subview isKindOfClass:[UIButton class]]) is always false for all items of actionSheet.subviews. So what I think is that the view heirarchy of UIActionSheet has been changed.

回答1:

There's an easy way if you still want to use UIActionSheet instead of UIAlertController in order to support older iOS versions.

UIActionSheet actually uses UIAlertController in iOS 8, and it has a private property _alertController.

SEL selector = NSSelectorFromString(@"_alertController");
if ([actionSheet respondsToSelector:selector])
{
    UIAlertController *alertController = [actionSheet valueForKey:@"_alertController"];
    if ([alertController isKindOfClass:[UIAlertController class]])
    {
        alertController.view.tintColor = [UIColor blueColor];
    }
}
else
{
    // use other methods for iOS 7 or older.
}

For Swift Below code should works

let alertAction = UIAlertAction(title: "XXX", style: .default) { (action) in

     }

    alertAction.setValue(UIColor.red, forKey: "titleTextColor")

回答2:

To change the button title color you need to use UIAlertController and set the tintColor of the main view.

Example of setting the button title colors to black:

UIAlertController *actionSheetController = [UIAlertController alertControllerWithTitle:@"How would you like to proceed?" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *finish = [UIAlertAction actionWithTitle:@"Finish" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action)
                               {
                                   [self performSelector:@selector(finish:) withObject:nil];
                               }];

UIAlertAction *playAgain = [UIAlertAction actionWithTitle:@"Play Again" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action)
                            {
                                [self performSelector:@selector(playAgain:) withObject:nil];
                            }];

UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action)
                         {
                             [actionSheetController dismissViewControllerAnimated:YES completion:nil];
                         }];

[actionSheetController addAction:finish];
[actionSheetController addAction:playAgain];
[actionSheetController addAction:cancel];

//******** THIS IS THE IMPORTANT PART!!!  ***********
actionSheetController.view.tintColor = [UIColor blackColor];

[self presentViewController:actionSheetController animated:YES completion:nil];

回答3:

Ok, I ran into the same problem but I think I have found a solution:

The appropriate way should be like this and I guess it works in iOS7:

[[UIButton appearanceWhenContainedIn:[UIActionSheet class], nil] setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];

But it will not work in iOS8 due to the fact that the ActionSheets "buttons" is now based on a UICollectionView. So after some digging around I got this to work instead:

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

回答4:

I'm using it.

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

Add one line (AppDelegate) and works for all UIAlertController.

回答5:

I have same task and I've made this hack today, dirty, but it works

class CustomAlertViewController: UIAlertController {

    internal var cancelText: String?


    private var font: UIFont? = UIFont(name: "MuseoSansCyrl-500", size: 12)

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.tintColor = UIColor.blackColor()
    }

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()

        self.findLabel(self.view) //if you need ios 9 only, this can be made in viewWillAppear
    }

    func findLabel(scanView: UIView!) {
        if (scanView.subviews.count > 0) {
            for subview in scanView.subviews {
                if let label: UILabel = subview as? UILabel {

                    if (self.cancelText != nil && label.text == self.cancelText!) {
                        dispatch_async(dispatch_get_main_queue(),{
                            label.textColor = UIColor.redColor() //for ios 8.x
                            label.tintColor = UIColor.redColor() //for ios 9.x
                        })
                    }

                    if (self.font != nil) {
                        label.font = self.font
                    }
                }

                self.findLabel(subview)
            }
        }
    }

}

回答6:

Changing the tintColor of window worked for me.

In the - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions method

write this:

[self.window setTintColor:[UIColor redColor]];

This changed the font color of all UIActionSheet objects.

回答7:

For iOS 7 backwards compatibility, and to collect the proper default tint colour (that Apple may well change in future versions), I use this. Thanks to the answers about default tint and to Lucas's answer above.

    const Class alertControllerClass = NSClassFromString(@"UIAlertController");
    if(alertControllerClass)
    {
        UIColor *defaultTintColour = UIView.new.tintColor;
        [[UIView appearanceWhenContainedIn: alertControllerClass, nil] setTintColor: defaultTintColour];
    }

Caution though – you need to ensure that you use this before you start setting the global tint otherwise the UIView.new.tintColor will just give you the current tint you have set up.

回答8:

Swift 4

    let alert =  UIAlertController(title: "title", message: "message", preferredStyle: .alert)
    alert.view.tintColor = UIColor.black
    self.present(alert, animated: true, completion: nil)

回答9:

For Swift you can do like this

    let alertAction = UIAlertAction(title: "XXX", style: .default) { (action) in

     }

    alertAction.setValue(UIColor.red, forKey: "titleTextColor")

来源：https://stackoverflow.com/questions/24154889/change-text-color-of-items-in-uiactionsheet-ios-8