For animating text into iPhone

 -(void)animateTextLayer {
   
    CGFloat animationDuration = 5;
   
    CATextLayer *textLayer = [CATextLayer layer];
    [textLayer setString:@"Hello World"];
    [textLayer setForegroundColor:[UIColor purpleColor].CGColor];
    [textLayer setFontSize:30];
    [textLayer setFrame:CGRectMake(20, 200, 300, 40)];
    [[self.view layer] addSublayer:textLayer];
   
    CABasicAnimation *colorAnimation = [CABasicAnimation
                                        animationWithKeyPath:@"foregroundColor"];
    colorAnimation.duration = animationDuration;
    colorAnimation.fillMode = kCAFillModeForwards;
    colorAnimation.removedOnCompletion = NO;
    colorAnimation.fromValue = (id)[UIColor purpleColor].CGColor;
    colorAnimation.toValue = (id)[UIColor greenColor].CGColor;
    colorAnimation.timingFunction = [CAMediaTimingFunction
                                     functionWithName:kCAMediaTimingFunctionLinear];
   
    CAKeyframeAnimation *scaleAnimation = [CAKeyframeAnimation
                                           animationWithKeyPath:@"transform"];
    NSArray *scaleValues = [NSArray arrayWithObjects:
                            [NSValue valueWithCATransform3D:CATransform3DScale(textLayer.transform, 1, 1, 1)],
                            [NSValue valueWithCATransform3D:CATransform3DScale(textLayer.transform, 1.5, 1.5, 1)],
                            [NSValue valueWithCATransform3D:CATransform3DScale(textLayer.transform, 0.5, 0.5, 1)], nil];
    [scaleAnimation setValues:scaleValues];
    scaleAnimation.fillMode = kCAFillModeForwards;
    scaleAnimation.removedOnCompletion = NO;
   
    CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
    animationGroup.duration = animationDuration;
    animationGroup.timingFunction = [CAMediaTimingFunction
                                     functionWithName:kCAMediaTimingFunctionLinear];
    animationGroup.fillMode = kCAFillModeForwards;
    animationGroup.removedOnCompletion = NO;
    animationGroup.animations =
    [NSArray arrayWithObjects:colorAnimation, scaleAnimation, nil];
   
    [textLayer addAnimation:animationGroup forKey:@"animateColorAndScale"];
}