## 一：效果 这里实现了大多数app都会有的软件新特性的功能，用的是UICollectionViewController实现的   ## 二：思路 这里用了UICollectionViewController实现，就是做一个没有间隙，每个cell都是一个屏幕的UICollectionViewController，自定义的。然后把下面的UIPageControl 还有最后一页的开始以及分享按钮放入就OK了。 调用的时候，首先获取当前的app的版本号，然后再获取上一个版本。进行两个版本的比较。当前版本和上一个版本不同，当前版本是从infoDictionary中拿到的，上一个版本是从自己存的NSUserDefaults 中的NYVersionKey拿到的，并且苹果允许上传小于当前版本的app，如果是第一个版本时候，上一个版本还没有值，也会不同。  根据结果设置window的不同根控制器。 自定义UICollectionViewController步骤：  要注意：  1.初始化的时候设置布局参数  2.collertionView必须注册cell  3.自定义cell ## 三：代码 调用部分代码：AppDelegate ~~~ //1,获取当前的版本号 NSString *currentVersion = [NSBundle mainBundle].infoDictionary[@"CFBundleVersion"]; //2，获取上一次的版本号 NSString *lastVersion = [[NSUserDefaults standardUserDefaults]objectForKey:NYVersionKey]; NYLog(@"currentVersion == %@ , lastVersion == %@ ",currentVersion, lastVersion); //判断是否有新的版本 if ([currentVersion isEqualToString:lastVersion]) { //如果没有新的版本(当前版本和上一个版本不同，当前版本是从infoDictionary中拿到的，上一个版本是从自己存的NSUserDefaults 中的NYVersionKey拿到的，并且苹果允许上传小于当前版本的app，如果是第一个版本时候，上一个版本还没有值，也会不同。) //创建tabBarVC NYTabBarController *tabBarVC = [[NYTabBarController alloc]init]; //设置窗口跟控制器 self.window.rootViewController = tabBarVC; }else{//如果有新的版本 //进入新特性界面 NYNewFeatureController *newFeatureVC = [[NYNewFeatureController alloc]init]; newFeatureVC.view.backgroundColor = [UIColor redColor]; self.window.rootViewController = newFeatureVC; //用偏好设置，保存当前版本。 [[NSUserDefaults standardUserDefaults]setObject:currentVersion forKey:NYVersionKey]; } ~~~ * * * 自定义的collectionViewController ### NYNewFeatureController.m ~~~ // // NYNewFeatureController.m // 猫猫微博 // // Created by apple on 15-8-1. // Copyright (c) 2015年 znycat. All rights reserved. // #import "NYNewFeatureController.h" #import "NYNewFeatureCell.h" @interface NYNewFeatureController () @property (nonatomic, weak) UIPageControl *control; @end @implementation NYNewFeatureController static NSString * const reuseIdentifier = @"cell"; - (void)viewDidLoad { [super viewDidLoad]; //注册cell，默认就会创建这个类型的cell [self.collectionView registerClass:[NYNewFeatureCell class] forCellWithReuseIdentifier:reuseIdentifier]; //分页 self.collectionView.pagingEnabled = YES; //取消弹簧效果 self.collectionView.bounces = NO; //不显示滚动条 self.collectionView.showsHorizontalScrollIndicator = NO; // 添加pageController [self setUpPageControl]; // Do any additional setup after loading the view. } // 添加pageController - (void)setUpPageControl { // 添加pageController,只需要设置位置，不需要管理尺寸 UIPageControl *control = [[UIPageControl alloc] init]; control.numberOfPages = 4; control.pageIndicatorTintColor = [UIColor blackColor]; control.currentPageIndicatorTintColor = [UIColor redColor]; // 设置center control.center = CGPointMake(self.view.width * 0.5, self.view.height); _control = control; [self.view addSubview:control]; } /*使用UICollectionViewController要注意： 1.初始化的时候设置布局参数 2.collertionView必须注册cell 3.自定义cell */ -(instancetype)init { // UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init]; //设置cell的尺寸 layout.itemSize = [UIScreen mainScreen].bounds.size; //清空cell间隔的行距 layout.minimumLineSpacing = 0; //设置cell的滑动方向 layout.scrollDirection = UICollectionViewScrollDirectionHorizontal; return [super initWithCollectionViewLayout:layout]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - UICollectionView代理和数据源 - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return 4; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { // dequeueReusableCellWithReuseIdentifier // 1.首先从缓存池里取cell // 2.看下当前是否有注册Cell,如果注册了cell，就会帮你创建cell // 3.没有注册，报错 NYNewFeatureCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath]; // 拼接图片名称 3.5 320 480 CGFloat screenH = [UIScreen mainScreen].bounds.size.height; NSString *imageName = [NSString stringWithFormat:@"new_feature_%ld",indexPath.row + 1]; if (screenH > 480) { // 5 , 6 , 6 plus imageName = [NSString stringWithFormat:@"new_feature_%ld-568h",indexPath.row + 1]; } cell.image = [UIImage imageNamed:imageName]; [cell setIndexPath:indexPath count:4]; return cell; } #pragma mark - UIScrollView代理 // 只要一滚动就会调用 - (void)scrollViewDidScroll:(UIScrollView *)scrollView { // 获取当前的偏移量，计算当前第几页 int page = scrollView.contentOffset.x / scrollView.bounds.size.width + 0.5; // 设置页数 _control.currentPage = page; } @end ~~~ 自定义的cell ### NYNewFeatureCell.h ~~~ // // NYNewFeatureCell.h // 猫猫微博 // // Created by apple on 15-8-1. // Copyright (c) 2015年 znycat. All rights reserved. // #import <UIKit/UIKit.h> @interface NYNewFeatureCell : UICollectionViewCell @property (nonatomic, strong) UIImage *image; // 判断是否是最后一页 - (void)setIndexPath:(NSIndexPath *)indexPath count:(int)count; @end ~~~ ### NYNewFeatureCell.m ~~~ // // NYNewFeatureCell.m // 猫猫微博 // // Created by apple on 15-8-1. // Copyright (c) 2015年 znycat. All rights reserved. // #import "NYNewFeatureCell.h" #import "NYTabBarController.h" @interface NYNewFeatureCell() @property (nonatomic, weak) UIImageView *imageView; //分享按钮 @property (nonatomic, weak) UIButton *shareButton; //开始按钮 @property (nonatomic, weak) UIButton *startButton; @end @implementation NYNewFeatureCell //分享按钮懒加载 - (UIButton *)shareButton { if (_shareButton == nil) { UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom]; [btn setTitle:@"分享给大家" forState:UIControlStateNormal]; [btn setImage:[UIImage imageNamed:@"new_feature_share_false"] forState:UIControlStateNormal]; [btn setImage:[UIImage imageNamed:@"new_feature_share_true"] forState:UIControlStateSelected]; [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [btn sizeToFit]; [self.contentView addSubview:btn]; _shareButton = btn; } return _shareButton; } //开始按钮懒加载 - (UIButton *)startButton { if (_startButton == nil) { UIButton *startBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [startBtn setTitle:@"开始微博" forState:UIControlStateNormal]; [startBtn setBackgroundImage:[UIImage imageNamed:@"new_feature_finish_button"] forState:UIControlStateNormal]; [startBtn setBackgroundImage:[UIImage imageNamed:@"new_feature_finish_button_highlighted"] forState:UIControlStateHighlighted]; [startBtn sizeToFit]; [startBtn addTarget:self action:@selector(start) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:startBtn]; _startButton = startBtn; } return _startButton; } -(UIImageView *)imageView { if (_imageView == nil) { UIImageView *imageV = [[UIImageView alloc]init]; _imageView = imageV; // 注意:一定要加载contentView [self.contentView addSubview:imageV]; } return _imageView; } // 布局子控件的frame -(void)layoutSubviews { [super layoutSubviews]; self.imageView.frame = self.bounds; // 分享按钮 self.shareButton.center = CGPointMake(self.width * 0.5, self.height * 0.8); // 开始按钮 self.startButton.center = CGPointMake(self.width * 0.5, self.height * 0.9); } -(void)setImage:(UIImage *)image { _image = image; self.imageView.image = image; } // 判断当前cell是否是最后一页 -(void)setIndexPath:(NSIndexPath *)indexPath count:(int)count { if (indexPath.row == count - 1) { // 最后一页,显示分享和开始按钮 self.shareButton.hidden = NO; self.startButton.hidden = NO; }else{ // 非最后一页，隐藏分享和开始按钮 self.shareButton.hidden = YES; self.startButton.hidden = YES; } } // 点击开始微博的时候调用 - (void)start { // 进入tabBarVc NYTabBarController *tabBarVc = [[NYTabBarController alloc] init]; // 切换根控制器:可以直接把之前的根控制器清空 NYKeyWindow.rootViewController = tabBarVc; } @end ~~~