猫猫学iOS 之微博项目实战(7)程序启动新特性用UICollectionViewController实现

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地址：http://blog.csdn.net/u013357243

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 NYNewFeatureControllerstatic 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cell3.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