UITextView resign first responder on 'Done'

问题

I have been searching around the web for about an hour now, and cannot find any code to help me with this.

I have a UITextView that I need to resign first responder of when the user presses the 'Done' button on their keyboard.

I have seen code floating around the internet like this:

-(BOOL) textFieldShouldReturn:(UITextField *)textField {
 [textField resignFirstResponder];
 return NO;
}

But that will not work for a UITextView. Simply put, How can I tell when the user presses the done button on the keyboard?

回答1:

Implement the shouldChangeTextInRange: delegate method.

Use below approach and the solution work only with @"\n" (new line character).

//In you *.h file make sure you add
@interface v1ViewController : UIViewController <UITextViewDelegate>

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    myTextField.delegate = self;
}

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

            if ([text isEqualToString:@"\n"]) {

                [textView resignFirstResponder];
                // Return FALSE so that the final '\n' character doesn't get added
                return NO;
            }
            // For any other character return TRUE so that the text gets added to the view
            return YES;
    }

回答2:

You can use the delegate method

- (void)textViewDidEndEditing:(UITextView *)textView { 
    [textView resignFirstResponder];
}

You have to set your controller as the delegate for the TextView. For more methods you can have a look here: http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UITextViewDelegate_Protocol/Reference/UITextViewDelegate.html%23//apple_ref/doc/uid/TP40006897

来源：https://stackoverflow.com/questions/6411858/uitextview-resign-first-responder-on-done