how to animate the uilabel view which has some text , in obj c

in my app i am planing 开发者_如何学Pythonto add the animation for the textLabels, which should come from left side of the screen

i have used following code but its crashing

(void)animateLoop {

    UILabel *mylab;
    mylab.text=@"SAAAAdiiiii";
    mylab.frame = CGRectMake(-mylab.bounds.size.width, 100, mylab.bounds.size.width, mylab.bounds.size.height);
    [UIView beginAnimations:@"timesquare" context:nil];
    [UIView setAnimationDuration:5];
    [UIView setAnimationRepeatAutoreverses:(YES)];
    [UIView setAnimationRepeatCount:10];

    mylab.frame = CGRectMake(480, 100, mylab.bounds.size.width, mylab.bounds.size.height);

    [UIView commitAnimations]; 
 }

n i called this in the viewDidload

but it was crashing at this line mylab.text=@"SAAAAdiiiii"; crashLog:invalidargument

can any one tell me how can i animate the uilabel

thanx in advance

You need to alloced the UILabel . means first create the memory for you label ...

UILabel *mylab = [[UILabel alloc] initWithFrame:CGRectMake(x,y,width,height)];
mylab.text=@"SAAAAdiiiii";

Suggest you to have UILabel *mylab; as iVar , because it has to be released.

You have to allocate and init your UILabel first.. instead of UILabel *mylab; try UILabel *mylab = [[UILabel alloc] init];

You also have to release it somewhere and you have to add the label to your view (something like [self.view addSubview:mylab];).