How to enable/disable a button while validating a button?

Question

here I try this code.......enter image description here I try this code...I want to disable a button while validating a username and password. if my username and password is correct then my button will enable...But I didn't get correct answer.

Answer 1

It looks to me like sbutton is an IBAction, not an outlet. If so your code probably won't compile. You need to control-drag from your button into your code to create an IBOutlet for your button and use the outlet to enable/disable the button.

Answer 2

-(void)checkValidation
{
    NSString *strUserName = [_txtUsername.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    NSString *strPassword = [_txtPassword.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

    if([strUserName isEqualToString:@"YOURSTRING"] && [strPassword isEqualToString:@"YOURSTRING"])
    {
        // make your button enable
    }
    else
    {
        // make it disable
    }
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{

    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
    newString = [newString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

    [self performSelector:@selector(checkValidation) withObject:nil afterDelay:0.3];

    return TRUE;
    }

Answer 3

If you don't set delegate to your text field then set the delegate as follows

self.stext1.delegate = self;
self.stext2.delegate = self;

Then implement this function

-(void)enableDisableSave {

    NSString * userName = @"kavitha";
    NSString * password = @"kavitha";

    if([userName isEqualToString:self.stext1.text] && [password isEqualToString:self.stext2.text]) {
        self.sendBtn.enabled = YES;
    } else {
        self.sendBtn.enabled = NO;
    }
}