引导页功能简介
方式一：
判断程序是否首次启动，如果是将GuidePageViewController作为窗口的根视图控制器。GuidePageViewController有三个子控件：一个UIScrollView、一个UIPageControl、一个UIButton(默认隐藏)，UIScrollView有多个UIImageView子控件，当滚动到最后一页UIButton展示，点击立即体验然后将窗口的根视图控制器设置为UITabBarController；
方式二：
也可以直接将根视图控制器设置为UITabBarController, 然后在第一个导航控制器的视图上展示引导页视图，当点击立即体验再将引导页视图隐藏掉即可。
示例代码
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// 首次启动应用程序时进入到引导页页面（暂时没有判断，可通过NSUserDefault实现）
self.window.rootViewController = [[GuidePageViewController alloc] init];
return YES;
}
@end
引导页视图控制器GuidePageViewController
#import "GuidePageViewController.h"
#import "ViewController.h"
#define kScreenWidth ([UIScreen mainScreen].bounds.size.width)
#define kScreenHeight ([UIScreen mainScreen].bounds.size.height)
#define kGuidePageCount 4
@interface GuidePageViewController () <UIScrollViewDelegate>
@property (weak, nonatomic) UIPageControl *pageControl;
@property (weak, nonatomic) UIButton *startAppButton;
@end
@implementation GuidePageViewController
- (void)viewDidLoad {
[super viewDidLoad];
// UIScrollView
UIScrollView *guidePageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight)];
guidePageScrollView.contentSize = CGSizeMake(kScreenWidth * kGuidePageCount, 0);
guidePageScrollView.showsHorizontalScrollIndicator = NO;
guidePageScrollView.pagingEnabled = YES;
guidePageScrollView.bounces = NO;
guidePageScrollView.delegate = self;
for (int i = 0; i < kGuidePageCount; i++) {
UIImageView *guideImageView = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenWidth * i, 0, kScreenWidth, kScreenHeight)];
guideImageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"guide-page-%d", i + 1]];
[guidePageScrollView addSubview:guideImageView];
}
[self.view addSubview:guidePageScrollView];
// UIPageControl（分页）
UIPageControl *pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake((kScreenWidth - 100) / 2, kScreenHeight- 50, 100, 30)];
pageControl.numberOfPages = kGuidePageCount;
pageControl.currentPage = 0;
pageControl.currentPageIndicatorTintColor = [UIColor greenColor];
[self.view addSubview:pageControl];
self.pageControl = pageControl;
// UIButton（立即体验）
UIButton *startAppButton = [UIButton buttonWithType:UIButtonTypeCustom];
startAppButton.frame = CGRectMake((kScreenWidth - 100) / 2, 550, 100, 40);
[startAppButton setTitle:@"立即体验" forState:UIControlStateNormal];
startAppButton.backgroundColor = [UIColor grayColor];
[startAppButton addTarget:self action:@selector(startAppAction) forControlEvents:UIControlEventTouchUpInside];
startAppButton.hidden = YES;
[self.view addSubview:startAppButton];
_startAppButton = startAppButton;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
NSInteger currentPage = scrollView.contentOffset.x / kScreenWidth;
self.pageControl.currentPage = currentPage;
if (currentPage == (kGuidePageCount - 1)) {
self.startAppButton.hidden = NO;
}
}
- (void)startAppAction {
// 根视图控制器一般是UITabBarController,这里简单实现
[UIApplication sharedApplication].keyWindow.rootViewController = [[ViewController alloc] init];
}
@end
