动画两种观点的问题

Question

So what I want is when the user taps on the the sideNav button two seperate animations will occur. The current view will slide out of the controller and a new view will slide in. I've set two different points of animation for the views but for some reason when the user taps on the sideNav button the views move as if they're connected. What am I doing wrong?

- (IBAction)sideNav:(id)sender {

    if (draw1 == 0) {
        draw1 = 1;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.4];
        [UIView setAnimationDelay:0.0];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];

        navView.frame = CGRectMake(0, 0, 320, 568);
        newsView.frame = CGRectMake(320, 0, 320, 568);

        [UIView commitAnimations];
    } else {
        draw1 = 0;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.4];
        [UIView setAnimationDelay:0.0];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];

        navView.frame = CGRectMake(-320, 0, 320, 568);
        newsView.frame = CGRectMake(0, 0, 320, 568);

        [UIView commitAnimations];

    }

}

Answer 1

One step toward answering your question is to simplify your code. First, unless it's used elsewhere as an integer, draw1 should be a BOOL , with values of YES and NO . Second, no need for all that identical repeated code. It's much easier to understand something like:

- (IBAction)sideNav:(id)sender {

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.4];
    [UIView setAnimationDelay:0.0];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];

    navView.frame = draw1 ? CGRectMake(-320, 0, 320, 568) : CGRectMake(0, 0, 320, 568);
    newsView.frame = draw1 ? CGRectMake(0, 0, 320, 568) : CGRectMake(320, 0, 320, 568);

    [UIView commitAnimations];

    draw1 = !draw1;
}