UIAlertView-Blocks taking input https://github.com/ryanmaxwell/UIAlertView-Blocks

UIAlertView-Input.m

- (IBAction)btnTouchEvent:(id)sender
{
    __block NSString *str;
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Rename" message:@"Enter new file name" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
    alert.delegate = alert;
    
    [alert setAlertViewStyle:UIAlertViewStylePlainTextInput];
    
    alert.shouldEnableFirstOtherButtonBlock = ^BOOL(UIAlertView *alertView) {
        str = [[alertView textFieldAtIndex:0].text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        return ([str length] > 0);
    };
    
    // When tapped on the other button
    [alert setTapBlock:^(UIAlertView *alertView, NSInteger buttonIndex) {
        if (buttonIndex != [alertView cancelButtonIndex]) {
            NSLog(@"String = %@", str);
        }
    }];
    
    [alert show];
}