第一次運(yùn)行一個(gè)程序時(shí)候，我們會(huì)看到新手引導(dǎo)頁，就是程序引導(dǎo)圖，除非后來版本升級，或者卸載軟件后重裝才會(huì)再次看到引導(dǎo)頁

我們先來看效果：

Untit.gif

這里我第一次運(yùn)行程序時(shí)候，直接是有引導(dǎo)圖的，后來兩次運(yùn)行都沒有再次出現(xiàn)引導(dǎo)圖。除非下次版本更新之后，或者卸載再次運(yùn)行程序才會(huì)出現(xiàn)引導(dǎo)圖。
先給大家兩張圖片分析一下

Snip20160911_3.png

Snip20160911_2.png

第一步：在AppDelegate.m文件中

Snip20160910_1.png

代碼呈上

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // 1.創(chuàng)建窗口
    self.window = [[UIWindow alloc] init];
    self.window.frame = [UIScreen mainScreen].bounds;
    // 2.設(shè)置根控制器
    NSString *key = @"CFBundleVersion";
    // 上一次的使用版本（存儲(chǔ)在沙盒中的版本號）
    NSString *lastVersion = [[NSUserDefaults standardUserDefaults] objectForKey:key];
    // 當(dāng)前軟件的版本號（從Info.plist中獲得）
    NSString *currentVersion = [NSBundle mainBundle].infoDictionary[key];
    if ([currentVersion isEqualToString:lastVersion]) { // 版本號相同：這次打開和上次打開的是同一個(gè)版本
        self.window.rootViewController = [[LYWTabBarViewController alloc] init];
    } else { // 這次打開的版本和上一次不一樣，顯示新特性
        self.window.rootViewController = [[LYWNewfeatureViewController alloc] init];
        // 將當(dāng)前的版本號存進(jìn)沙盒
        [[NSUserDefaults standardUserDefaults] setObject:currentVersion forKey:key];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
    // 3.顯示窗口
    [self.window makeKeyAndVisible];
    return YES;
}

第二步：在LYWNewfeatureViewController.m 中實(shí)現(xiàn)簡單的輪播圖效果

#import "LYWNewfeatureViewController.h"
#import "LYWTabBarViewController.h"

#define NewfeatureCount 3
@interface LYWNewfeatureViewController ()<UIScrollViewDelegate>
@property (nonatomic,weak) UIPageControl *pageControl;
@end

@implementation LYWNewfeatureViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupScrollView];
}

//創(chuàng)建UIScrollView并添加圖片
- (void)setupScrollView
{
    UIScrollView *scrollView = [[UIScrollView alloc] init];
    scrollView.frame = [UIScreen mainScreen].bounds;
    [self.view addSubview:scrollView];
    
    scrollView.bounces = NO;
    scrollView.pagingEnabled = YES;
    scrollView.showsVerticalScrollIndicator = NO;
    scrollView.showsHorizontalScrollIndicator = NO;
    scrollView.contentSize = CGSizeMake(3*kScreenWidth, 0);
    scrollView.delegate = self;
    
    for (NSInteger i = 0; i < NewfeatureCount; i++) {
        UIImageView *imageView = [[UIImageView alloc] init];
        imageView.x = i * kScreenWidth;
        imageView.y = 0;
        imageView.width = kScreenWidth;
        imageView.height = kScreenHeight;
        NSString *name = [NSString stringWithFormat:@"f%ld-5",i+1];
        imageView.image = [UIImage imageNamed:name];
        [scrollView addSubview:imageView];
        if (i == NewfeatureCount - 1) {
            [self setupStartBtn:imageView];
        }
    }
    
    // 4.添加pageControl：分頁，展示目前看的是第幾頁
    UIPageControl *pageControl = [[UIPageControl alloc] init];
    pageControl.numberOfPages = NewfeatureCount;
    pageControl.backgroundColor = [UIColor redColor];
    pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];
    pageControl.pageIndicatorTintColor = KRGB(189, 189, 189);
    pageControl.centerX = kScreenWidth * 0.5;
    pageControl.centerY = kScreenHeight - 50;
    [self.view addSubview:pageControl];
    self.pageControl = pageControl;
}

//左上角的灰色跳過按鈕
-(void)createSkipBt
{
    UIButton *skipBt = [UIButton buttonWithType:UIButtonTypeCustom];
    skipBt.frame = CGRectMake(kScreenWidth - 90, 40, 80, 30);
    skipBt.backgroundColor = [UIColor colorWithRed:0.3 green:0.3f blue:0.3f alpha:0.3];
    [skipBt setTitle:@"跳過" forState:UIControlStateNormal];
    [skipBt setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    skipBt.layer.cornerRadius = 10;
    skipBt.clipsToBounds = YES;
    skipBt.tag = 10;
    [skipBt addTarget:self action:@selector(BtnDidClicked) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:skipBt];
}

//手動(dòng)拖拽結(jié)束時(shí)候調(diào)用
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    double page = scrollView.contentOffset.x / scrollView.width;
    // 四舍五入計(jì)算出頁碼
    self.pageControl.currentPage = (int)(page + 0.5);
    // 1.3四舍五入 1.3 + 0.5 = 1.8 強(qiáng)轉(zhuǎn)為整數(shù)(int)1.8= 1
    // 1.5四舍五入 1.5 + 0.5 = 2.0 強(qiáng)轉(zhuǎn)為整數(shù)(int)2.0= 2
    // 1.6四舍五入 1.6 + 0.5 = 2.1 強(qiáng)轉(zhuǎn)為整數(shù)(int)2.1= 2
    // 0.7四舍五入 0.7 + 0.5 = 1.2 強(qiáng)轉(zhuǎn)為整數(shù)(int)1.2= 1
}

//給最后一張圖片添加 進(jìn)入問醫(yī)生按鈕
- (void)setupStartBtn:(UIImageView *)imgView
{
    imgView.userInteractionEnabled = YES;
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setBackgroundImage:[UIImage imageNamed:@"cancel_ask"] forState:UIControlStateNormal];
    btn.size = btn.currentBackgroundImage.size;
    btn.centerX = imgView.width * 0.5;
    btn.centerY = imgView.height * 0.75;
    [btn setTitle:@"進(jìn)入問醫(yī)生" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(BtnDidClicked) forControlEvents:UIControlEventTouchUpInside];
    [imgView addSubview:btn];
}

//進(jìn)入問醫(yī)生按鈕點(diǎn)擊事件
-(void)BtnDidClicked
{
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    window.rootViewController = [[LYWTabBarViewController alloc] init];
}

@end

這樣就??了，其實(shí)很簡單，不過是最近一個(gè)外包項(xiàng)目過來，然后我接手了，給它做一了一個(gè)啟動(dòng)引導(dǎo)圖，閑來沒事，就寫寫這片文章打法自己無聊的時(shí)間，也方便很多初學(xué)者學(xué)習(xí)

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簡書號：凡塵一笑：[簡書]

http://www.itdecent.cn/users/0158007b8d17/latest_articles

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文／凡塵一笑（簡書作者）

原文鏈接： http://www.itdecent.cn/p/8ae080edb3ea

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