这是可以实现利用滚动视图实现效果很不错的用户指引界面功能。支持引导页面的自动滑动和手动滑动。两个页面之间的过渡是渐隐渐现（淡入淡出 fade in and fade out）的动画效果。指引页面的文字有固定文字标题和随着页面切换而切换的文字标题。这种用户指引界面用在Path 3.0 App中。由于用了auto layout，所以只支持iOS 6.0 以上。若在iOS 5.0或以下运行，页面切换会有跳动的感觉。
使用方法：
设置每个页面的图片以及相应的文字：
// Init the pages texts, and pictures.
ICETutorialPage *layer1 = [[ICETutorialPage alloc] initWithSubTitle:@"Picture 1"
description:@"Champs-Elysées by night"
pictureName:@"tutorial_background_00@2x.jpg"];
ICETutorialPage *layer2 = [[ICETutorialPage alloc] initWithSubTitle:@"Picture 2"
description:@"The Eiffel Tower with cloudy weather"
pictureName:@"tutorial_background_01@2x.jpg"];
[...]
// Load into an array.
NSArray *tutorialLayers = @[layer1,layer2,layer3,layer4,layer5];
加载指引页面：
self.viewController = [[ICETutorialController alloc] initWithNibName:@"ICETutorialController_iPhone"
bundle:nil
andPages:tutorialLayers];
// Set the common styles, and start scrolling (auto scroll, and looping enabled by default)
[self.viewController setCommonPageSubTitleStyle:subStyle];
[self.viewController setCommonPageDescriptionStyle:descStyle];
// Set button 1 action.
[self.viewController setButton1Block:^(UIButton *button){
NSLog(@"Button 1 pressed.");
}];
// Set button 2 action, stop the scrolling.
__unsafe_unretained typeof(self) weakSelf = self;
[self.viewController setButton2Block:^(UIButton *button){
NSLog(@"Button 2 pressed.");
NSLog(@"Auto-scrolling stopped.");
[weakSelf.viewController stopScrolling];
}];
// Run it.
[self.viewController star
