iOS UIAlertview with uitextview editable

问题

I'm searching for a way of putting an UITextView editable inside an UIAlertView.

I know how to put a simple textfield with :

alert.alertViewStyle = UIAlertViewStylePlainTextInput;

But this isn't what i want. I want a bigger text input so a user can write a comment after a news for example.

Is this possible ?

回答1:

Unfortunately what you are after isn't possible with a UIAlertView.

Apple don't allow developers to modify the view hierarchy of a UIAlertView or subclass it. Check out the Apple Documentation for UIAlertView. Under the section marked Subclassing note you will find

The UIAlertView class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

Unfortunately though because UIAlertView still has the addSubview: method so it contradicts what Apple are actually telling us but the reason this is still here is because UIAlertView is a subclass of UIView which has this method. So what Apple have done is they have overridden this method so that it does absolutely nothing so when you call [myAlertView addSubview:myView]; will do nothing and no view will be added to the UIAlertView.

So to get the behavior you are after you will need to implement a Custom AlertView (Check out Google search for Custom UIAlertView).

Fortunately in iOS 8 Apple introduced a new class called UIAlertController that allows you to get the behavior that you are after and they have deprecated the UIAlertView class.

回答2:

Add a custom view into the alert view.

Change preferredStyle to .alert and .actionsheet as per the requirement.

func showPopUpWithTextView() {
        let alertController = UIAlertController(title: "\n\n\n\n\n\n", message: nil, preferredStyle: .actionSheet)

        let margin:CGFloat = 8.0
        let rect = CGRect(x: margin, y: margin, width: alertController.view.bounds.size.width - margin * 4.0, height: 100.0)
        let textView = UITextView(frame: rect)
        textView.backgroundColor = .clear

        alertController.view.addSubview(textView)

        let submitAction = UIAlertAction(title: "Something", style: .default, handler: {(alert: UIAlertAction!) in print("Submit")
            print(textView.text)
        })

        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: {(alert: UIAlertAction!) in print("cancel")})

        alertController.addAction(submitAction)
        alertController.addAction(cancelAction)

        self.present(alertController, animated: true, completion:{})
    }

来源：https://stackoverflow.com/questions/28454595/ios-uialertview-with-uitextview-editable

标签

ios

uitextview

uialertview