Prevent AlertView dismissal

问题

Can anyone help me in preventing dismissal of alertview on its button click event??

I have a textview as a subview of my alertView and i dont want to dismiss it if textview's value is nil.

回答1:

That might be against HIG Guidelines to NOT to dismiss an UIAlertView.

WORKAROUND : I don't know what goes on in your app, but to acheive this thing, what you could do is dismiss the AlertView and then check if textView's text is set or not. If it is set to nil, then bring up the alertview again!

回答2:

As this is very old question,but I got one solution and though of posting if any other developer need in near future.

Implement protocol methods in .h file

In order to respond to button taps in our UIAlertView, we will use the – alertView:clickedButtonAtIndex: protocol method as

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

}
//Now below code will check if uitextfield value.
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
{
    NSString *inputText = [[alertView textFieldAtIndex:0] text];
    if( [inputText length] > 0)
    {
       //text field value is greater than zero ,then Done button will appear as blue,or else it will be blurred
        return YES;
    }
    else
    {
        return NO;
    }
}

Alternately, there is a much faster approach:

return [inputText length] ? YES : NO;

The does the same thing as the if statement does.

回答3:

i'm not sure you can.

- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView

is the only option available on callBack. And there's still at least one active button.

If you really need that specific behavior, try reimplementing your own UIAlertView

来源：https://stackoverflow.com/questions/12802709/prevent-alertview-dismissal

标签

objective-c

ios

uialertview