how to know when text is pasted into UITextView

Question

What event is fired when a block of text is pasted into a UITextView? I need to modify the frame of my textView when the text is pasted in.

Thanks for reading.

Answer 1

carlos16196 was a good approach, but I would also tweak it by changing [text isEqualToString:[UIPasteboard generalPasteboard].string] to [text containsString:[UIPasteboard generalPasteboard].string]

By doing this, you will detect when user pastes in the textview after other typed text that is not in the UIPasteboard.

This is the code:

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {

// Here we check if the replacement text is equal to the string we are currently holding in the paste board
if ([text containsString:[UIPasteboard generalPasteboard].string]) {

    // code to execute in case user is using paste

} else {

    // code to execute other wise
}

return YES;
}

Answer 2

Your UITextView will call its UITextViewDelegate method

 - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

if a delegate has been set up. This gets called both when a character is typed on the keyboard, and when text is pasted into the text view. The text pasted in is the replacementText argument.

See http://developer.apple.com/library/ios/#documentation/uikit/reference/UITextViewDelegate_Protocol/Reference/UITextViewDelegate.html#//apple_ref/occ/intf/UITextViewDelegate

Answer 3

Here is what i use to detect paste events in UITextView:

 // Set this class to be the delegate of the UITextView. Now when a user will paste a text in that textview, this delegate will be called.
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {

    // Here we check if the replacement text is equal to the string we are currently holding in the paste board
    if ([text isEqualToString:[UIPasteboard generalPasteboard].string]) {

        // code to execute in case user is using paste

    } else {

        // code to execute other wise
    }

    return YES;
}

Answer 4

Checking the pasteboard's string by if string == UIPasteboard.general.string takes a couple of seconds if you have long sentence in the pasteboard. The user sees the keypad is frozen while this check. My solution is to check if the length of new characters is longer than 1. If it is longer than 1, the string is from the pasteboard.

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if string.characters.count > 1{
            //User did copy & paste

        }else{
            //User did input by keypad
        }            
         return true
 }

Answer 5

try subclasses UITextview,and override this function.

public override func paste(_ sender: Any?) 

Answer 6

It is for Swift5.1

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    if let paste = UIPasteboard.general.string, text == paste {
       print("paste")
    } else {
       print("normal typing")
    }
    return true
}