Textfield resignFirstResponder Very late?

I have one strange problem.I have two UItextfields in my view and a button.When i click on button.I have changed the frame of view in animation block but it's resigning later here is my code if someone told me about this i'll be thankful

-(IBAction)SignINClicked
{
    [Email resignFirstResponder]; //TextField
[Password resignFirstResponder];//TextField
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.10]; 
[[self view] setFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
[UIView commitAnimations];  
sleep(0.10);
if([Email.text isEqualToString:@""] || [Password.text isEqualToString:@""])
{
    if([Email.text isEqualToString:@""] && [Password.text isEqualToString:@""])
    {
        UIAlertView *Error = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please fill email and password" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [Error show];
        [Erro开发者_JAVA百科r release];
    }       
    else if([Email.text isEqualToString:@""])
    {
        UIAlertView *Error = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please fill email" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [Error show];
        [Error release];
    }
    else if([Password.text isEqualToString:@""])
    {
            UIAlertView *Error = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please fill password" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [Error show];
            [Error release];
    }
}
else
{
    [AppDelegate startLoading];     
    BOOL isCorrectUser=[self logIn:Email.text Password:Password.text];
    if (isCorrectUser==TRUE)
    {
        if(checkboxSelected==1)
            [self rememberMe:YES];
        else
            [self rememberMe:NO];
        [self performSelector:@selector(ShowDashboard) withObject:nil afterDelay:5];
    }   
    else
    {
        [AppDelegate endLoading];
        UIAlertView *Error = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Either user name/password is incorrect" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [Error show];
        [Error release];
    }
}

}

-(void)startLoading
{
[UIApplication sharedApplication].networkActivityIndicatorVisible=YES;
if(MyWaitViewObj==nil)
{
    MyWaitViewObj = [[MyWaitViewController alloc] initWithNibName:@"MyWaitView" bundle:nil];
}   
[NSThread detachNewThreadSelector:@selector(showMyWaitView) toTarget:self withObject:nil];
[NSThread sleepForTimeInterval:0.1];
}

-(void)endLoading
{
[MyWaitViewObj.view  removeFromSuperview];
[UIApplication sharedApplication].networkActivityIndicatorVisible=NO;
}

Now when i click on signin button the [appdelegate startloading] method executes first and then keyboard hides.While actually it should hide the keyboard first and then start loading

Try taking out the sleep statement. If you need something to happen after a delay, put it in it's own method and call it with:

[self performSelector:@selector(someMethod:) withObject:nil afterDelay:someTimeDelay];