In this tutorial, I'll give an example of how to have your own welcome image, and add the fade and zoom effect to it. When the iPhone launches your application, it looks for an image named Default.png in the resources directory. In the following example, Default.png is being replaced by a UIImageView which zooms and then fades away. (Consider abc to be your project name)
1. To abcAppDelegate.h, add the function declaration
- (void) welcomeScreen
2. To abcAppDelegate.m, add the function definition
- (void) welcomeScreen
{
//Welcome Screen
UIImageView* welcome = [[[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,480)]autorelease];
welcome.image = [UIImage imageNamed:@"img.png"];
[window addSubview:welcome];
[window bringSubviewToFront:welcome];
//Animation Effects (zoom and fade)
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:window cache:YES];
[UIView setAnimationDelegate:welcome];
[UIView setAnimationDidStopSelector:@selector(removeFromSuperview)];
//set transparency to 0.0
welcome.alpha = 0.0;
//zoom effect
welcome.frame = CGRectMake(-60, -60, 440, 600);
[UIView commitAnimations];
}
3. Call the method welcomeScreen
From applicationDidFinishLaunching method in abcAppDelegate.m, invoke welcomeScreen.
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window addSubview:viewController.view];
[window makeKeyAndVisible];
[NSTimer scheduledTimerWithTimeInterval:1.0/30. target:self selector:@selector(welcomeScreen) userInfo:nil repeats:NO];
}
And it's a wrap! Cheers!
