做這個(gè)東西的話松捉，其實(shí)主要是因?yàn)橐患律視?huì)比較經(jīng)常食用手機(jī)迅雷下載電影戈次，每次開啟迅雷，都會(huì)默認(rèn)來(lái)一段廣告筒扒，這種強(qiáng)制的讓使用者看廣告的行為雖然讓人很討厭怯邪，但是本著好奇就認(rèn)真挖掘的原則，看了一下網(wǎng)上的介紹花墩，再自己實(shí)踐了一下悬秉。
1, AppDelegate，入口冰蘑，處理不同的回調(diào)和泌，比如現(xiàn)在定義的三種不同結(jié)果，一是廣告時(shí)間耗盡祠肥，未點(diǎn)擊廣告武氓，也未點(diǎn)擊跳過(guò)廣告按鈕了；二是點(diǎn)擊廣告仇箱；三是點(diǎn)擊跳過(guò)按鈕聋丝，程序中只是簡(jiǎn)單的根據(jù)不同的事件定義了不同的回調(diào)，并未繼續(xù)做進(jìn)一步的處理

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    /*
     簡(jiǎn)書主頁(yè)：http://www.reibang.com/users/1bacae3170dd/latest_articles
     */
    /*添加廣告
     1.初始化工碾，選擇屏占比
     2.設(shè)置廣告總時(shí)長(zhǎng)弱睦，可跳過(guò)，默認(rèn)是6秒
     3.啟動(dòng)計(jì)時(shí)器
     */
//    MCLaunchAdView* view = [[MCLaunchAdView alloc] initWithWindow:self.window with:MCAdViewTypeFullScreen];
//    MCLaunchAdView* view = [[MCLaunchAdView alloc] initWithWindow:self.window with:MCAdViewTypeHalfScreen];
//    MCLaunchAdView* view = [[MCLaunchAdView alloc] initWithWindow:self.window with:MCAdViewTypeThreeQuarters];
    MCLaunchAdView* view = [[MCLaunchAdView alloc] initWithWindow:self.window with:MCAdViewTypeFiveSixths];
    //顯示本地圖片
//    view.localImageName = @"adImage_lion.png";
    //顯示網(wǎng)絡(luò)圖片
    view.imageURL = @"http://imgsrc.baidu.com/forum/pic/item/65c1a9cc7b899e51371108904aa7d933c9950d56.jpg";
//    http://imgsrc.baidu.com/forum/pic/item/65c1a9cc7b899e51371108904aa7d933c9950d56.jpg
    [view setTimer:6];
    [view startTimer];
    view.clickBlock = ^(MCQuitLaunchAdStyle tag){
        MCQuitLaunchAdStyle style = MCQuitLaunchAdStyleDefault;
        switch (tag) {
            case MCQuitLaunchAdStyleTimeOut:{
                NSLog(@"%@",NSLocalizedString(@"時(shí)間耗盡", nil));
                style = MCQuitLaunchAdStyleTimeOut;
            }
                break;
            case MCQuitLaunchAdStyleSkip:{
                NSLog(@"%@",NSLocalizedString(@"跳過(guò)廣告", nil));
                style = MCQuitLaunchAdStyleSkip;
            }
                break;
            case MCQuitLaunchAdStyleJumpToURL:{
                NSLog(@"%@",NSLocalizedString(@"進(jìn)入廣告", nil));
                style = MCQuitLaunchAdStyleJumpToURL;
            }
                break;
            default:{
                NSLog(@"%@",NSLocalizedString(@"未知原因", nil));
                style = MCQuitLaunchAdStyleDefault;
            }
                break;
        }
        ViewController* vc = [[ViewController alloc] initWithLaunchStyle:style];
        vc.view.backgroundColor = [UIColor whiteColor];
        self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:vc];
    };
    //打印mainbundle
    NSDictionary* dict = [[NSBundle mainBundle] infoDictionary];
    NSLog(@"%@",dict);
    //
    return YES;
}

2, MCLaunchAdView渊额，主要UI况木，顯示在App上的啟動(dòng)頁(yè)，可以看到的東西旬迹，都是在這里面

MCLaunchAdView.h

#import <UIKit/UIKit.h>
/*廣告顯示屏幕占比類型火惊，對(duì)應(yīng)的NSUInteger竟然選擇有意義一點(diǎn)的*/
typedef NS_ENUM(NSUInteger, MCAdViewType) {
    MCAdViewTypeFullScreen = 1,//全屏
    MCAdViewTypeHalfScreen = 2,//半屏
    MCAdViewTypeThreeQuarters = 4,//四分之三屏
    MCAdViewTypeFiveSixths = 6,//六分之五屏
};

/*廣告結(jié)束的方式*/
typedef NS_ENUM(NSUInteger, MCQuitLaunchAdStyle) {
    MCQuitLaunchAdStyleDefault = 0,
    MCQuitLaunchAdStyleTimeOut,//時(shí)間耗盡
    MCQuitLaunchAdStyleSkip,//跳過(guò)廣告
    MCQuitLaunchAdStyleJumpToURL,//進(jìn)入廣告
};

/*塊回調(diào)，廣告結(jié)束后根據(jù)不同的結(jié)束方式處理下一步*/
typedef void (^MCClick) (MCQuitLaunchAdStyle tag);

/*廣告*/
#pragma mark - MCLaunchAdView
@interface MCLaunchAdView : UIView

@property (nonatomic, strong) UIWindow* window;
@property (nonatomic, strong) NSString* localImageName;//本地圖片名
@property (nonatomic, strong) NSString* imageURL;//網(wǎng)絡(luò)圖片名
@property (nonatomic, copy) MCClick clickBlock;//塊回調(diào)奔垦，處理不同的操作

-(instancetype)initWithWindow:(UIWindow*)window with:(MCAdViewType)type;
-(void)setTimer:(NSInteger)time;
-(void)startTimer;
@end

MCLaunchAdView.m

//
//  MCLaunchAdView.m
//  MCLaunchAd
//
//  Created by 朱進(jìn)林 on 9/16/16.
//  Copyright ? 2016 Martin Choo. All rights reserved.
//

#import "MCLaunchAdView.h"
#import "MCCountingButton.h"
#import "UIImageView+WebCache.h"

#define screenWidth [UIScreen mainScreen].bounds.size.width
#define screenHeight [UIScreen mainScreen].bounds.size.height

#define TIMER_INTERVAL 0.04 //25幀每秒
#define SKIPBUTTONSIZE 30

#pragma mark - MCLaunchAdView
@interface MCLaunchAdView()
{
    MCCountingButton* _countingBtn;//跳過(guò)廣告按鈕
}
@property (nonatomic) MCAdViewType adViewtype;
@property (nonatomic, strong) UIImageView* adView;/*廣告界面*/
@property (nonatomic) NSInteger adTime;//廣告時(shí)長(zhǎng)屹耐，默認(rèn)6秒
@property (nonatomic) CGFloat adTimeLeft;/*剩余時(shí)間，用于計(jì)算時(shí)間是否耗盡*/
@property (nonatomic, strong) NSTimer* countTimer;/*計(jì)時(shí)器*/
@end

@implementation MCLaunchAdView

/*初始化*/
-(instancetype)initWithWindow:(UIWindow*)window with:(MCAdViewType)type
{
    self = [super init];
    if (self) {
        //
        self.window = window;
        [window makeKeyAndVisible];
        self.adViewtype = type;
        self.adTime = 6;//默認(rèn)6秒
        self.adTimeLeft = self.adTime;
        [self initailView];
        [self.window addSubview:self];
    }
    return self;
}

-(void)initailView
{
    //廣告界面
    {
        UIImageView* imgView = [[UIImageView alloc] init];
        imgView.contentMode = UIViewContentModeScaleToFill;//因?yàn)閳D片不一定鋪滿整個(gè)屏幕椿猎，所以這里暫時(shí)做了拉伸
        [self addSubview:imgView];
        self.adView = imgView;
    }
    //跳過(guò)按鈕
    {
        MCCountingButton* countingBtn = [[MCCountingButton alloc] initWithFrame:CGRectMake(0, 0, SKIPBUTTONSIZE, SKIPBUTTONSIZE)];
        [countingBtn addTarget:self action:@selector(skipButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
        [self.adView addSubview:countingBtn];
        _countingBtn = countingBtn;
    }
}

-(void)layoutSubviews
{
    self.frame = CGRectMake(0, 0, screenWidth, screenHeight);
    //設(shè)置啟動(dòng)界面的背景惶岭，顯示logo
    NSString* imgName = [self getBestLaunchImage];
    UIImage* img = [UIImage imageNamed:imgName];
    self.layer.contents = (id)img.CGImage;
    //根據(jù)不同的廣告占屏比設(shè)置不同的布局
    if (self.adViewtype == MCAdViewTypeFullScreen) {
        self.adView.bounds = CGRectMake(0, 0, screenWidth, screenHeight);
    }else if (self.adViewtype == MCAdViewTypeHalfScreen) {
        self.adView.bounds = CGRectMake(0, 0, screenWidth, 2*screenHeight/3);
    }else if (self.adViewtype == MCAdViewTypeThreeQuarters) {
        self.adView.bounds = CGRectMake(0, 0, screenWidth, 3*screenHeight/4);
    }else if (self.adViewtype == MCAdViewTypeFiveSixths) {
        self.adView.bounds = CGRectMake(0, 0, screenWidth, 5*screenHeight/6);
    }else {
        self.adView.bounds = CGRectMake(0, 0, screenWidth, screenHeight);
    }
    self.adView.center = CGPointMake(screenWidth/2, self.adView.bounds.size.height/2);
    //跳過(guò)按鈕的布局
    _countingBtn.center = CGPointMake(screenWidth-SKIPBUTTONSIZE/2-5, SKIPBUTTONSIZE/2+20);
    _countingBtn.tickTockInterval = TIMER_INTERVAL*1000;//設(shè)置計(jì)時(shí)間隔
    _countingBtn.totalTime = self.adTime;//設(shè)置總時(shí)長(zhǎng)
}
/*設(shè)置計(jì)時(shí)器時(shí)長(zhǎng)寿弱，不調(diào)用這個(gè)方法，就使用計(jì)時(shí)器默認(rèn)的6秒*/
-(void)setTimer:(NSInteger)time
{
    self.adTime = time;
    self.adTimeLeft = time;
}
/*啟動(dòng)計(jì)時(shí)器*/
-(void)startTimer
{
    //添加計(jì)時(shí)器
    self.countTimer = [NSTimer scheduledTimerWithTimeInterval:TIMER_INTERVAL target:self selector:@selector(TickTock) userInfo:nil repeats:YES];
}
/*關(guān)閉計(jì)時(shí)器*/
-(void)closeTimer
{
    //關(guān)閉
    if (self.countTimer) {
        [self.countTimer invalidate];
        self.countTimer = nil;
    }
}

#pragma mark - Action
/*過(guò)了一個(gè)計(jì)時(shí)單位TIMER_INTERVAL按灶，檢查剩余時(shí)間*/
-(void)TickTock
{
    if (self.adTimeLeft > 0) {
        //默認(rèn)6秒症革，時(shí)間未耗盡，繼續(xù)展示
        self.adTimeLeft = self.adTimeLeft - TIMER_INTERVAL;
        [_countingBtn counting];
    }else {
        //默認(rèn)6秒鸯旁，時(shí)間耗盡
        [self closeTimer];
        if (self.clickBlock) {
            self.clickBlock(MCQuitLaunchAdStyleTimeOut);
        }
    }
}
/*響應(yīng)點(diǎn)擊跳過(guò)按鈕事件*/
-(void)skipButtonClicked:(UIButton*)btn
{
    [self closeTimer];
    if (self.clickBlock) {
        self.clickBlock(MCQuitLaunchAdStyleSkip);
    }
}
/*響應(yīng)點(diǎn)擊廣告事件*/
-(void)jumpToURL:(UITapGestureRecognizer*)recognizer
{
    [self closeTimer];
    if (self.clickBlock) {
        self.clickBlock(MCQuitLaunchAdStyleJumpToURL);
    }
}

#pragma mark - 獲取最佳啟動(dòng)圖
/*獲取最佳啟動(dòng)圖噪矛，根據(jù)硬件設(shè)備分辨率，從info.plist中獲取圖片名铺罢，需要在plist中添加相關(guān)的圖片信息艇挨，從而適配不同尺寸的設(shè)備*/
-(NSString*)getBestLaunchImage
{
    NSString* launchImage = nil;
    CGSize viewSize = [UIScreen mainScreen].bounds.size;
    NSString* viewOrientation = @"Portrait";//如需設(shè)置橫屏，請(qǐng)修改為L(zhǎng)andscape,對(duì)應(yīng)的viewSize也要切換一下
    if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation)) {
        viewSize = CGSizeMake(viewSize.height, viewSize.width);
        viewOrientation = @"Landscape";
    }
    //比較設(shè)備分辨率和圖片尺寸韭赘，取得匹配的圖片名
    NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
    for (NSDictionary* dict in imagesDict) {
        CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);
        if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
            //這邊會(huì)有問(wèn)題缩滨，因?yàn)槠聊徽急炔灰欢ㄈ粒赃@邊其實(shí)還要進(jìn)一步截取屏幕的大小辞居，但是這邊我省略了楷怒，外部在調(diào)用的時(shí)候我做了拉伸的處理
            launchImage = dict[@"UILaunchImageName"];
    }
    //沒(méi)有匹配的圖片，取默認(rèn)的圖片名
    if (!launchImage) {
        launchImage = @"LaunchImageIconLogo_930.png";
    }
    return launchImage;
}

#pragma mark -
/*重寫setter方法瓦灶，支持GIF圖的顯示*/
-(void)setLocalImageName:(NSString *)localImageName
{
    _localImageName = localImageName;
    if (_localImageName) {
        if ([[_localImageName uppercaseString] rangeOfString:@".GIF"].location != NSNotFound) {
            _localImageName = [_localImageName stringByReplacingCharactersInRange:[[_localImageName uppercaseString] rangeOfString:@".GIF"] withString:@""];
            NSData* gifData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:_localImageName ofType:@"gif"]];
            UIWebView* webView = [[UIWebView alloc] initWithFrame:self.adView.frame];
            webView.backgroundColor = [UIColor clearColor];
            webView.scalesPageToFit = YES;
            [webView loadData:gifData MIMEType:@"image/gif" textEncodingName:@"" baseURL:[NSURL URLWithString:@""]];
            [self.adView addSubview:webView];
            [self.adView bringSubviewToFront:_countingBtn];
        }else {
            self.adView.image = [UIImage imageNamed:_localImageName];
        }
        //添加點(diǎn)擊廣告監(jiān)聽,在此處添加鸠删，避免沒(méi)有圖片時(shí)點(diǎn)擊區(qū)域依然跳轉(zhuǎn)的發(fā)生
        UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(jumpToURL:)];
        self.adView.userInteractionEnabled = YES;
        [self.adView addGestureRecognizer:tap];
    }
}
-(void)setImageURL:(NSString *)imageURL
{
    _imageURL = imageURL;
    if (_imageURL) {
        SDWebImageManager* manager = [SDWebImageManager sharedManager];
        [manager downloadImageWithURL:[NSURL URLWithString:_imageURL] options:SDWebImageRetryFailed progress:^(NSInteger receivedSize, NSInteger expectedSize) {
            NSLog(@"receivedSize:%ld, expectedSize:%ld",receivedSize,expectedSize);
        } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
            if (image) {
                self.adView.image = image;
                //添加點(diǎn)擊廣告監(jiān)聽,在此處添加，避免沒(méi)有圖片時(shí)點(diǎn)擊區(qū)域依然跳轉(zhuǎn)的發(fā)生
                UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(jumpToURL:)];
                self.adView.userInteractionEnabled = YES;
                [self.adView addGestureRecognizer:tap];
            }
        }];
    }
}
@end

3, MCCountingButton贼陶，倒計(jì)時(shí)按鈕刃泡，也就是跳過(guò)廣告按鈕，這邊是依照設(shè)置的倒計(jì)時(shí)總時(shí)長(zhǎng)畫個(gè)圓環(huán)碉怔，可以擴(kuò)展一下烘贴，加上一些其它的動(dòng)畫，比如廣告圖下面加進(jìn)度條撮胧，顯示讀秒的跳過(guò)按鈕桨踪，模仿水位上升的倒計(jì)時(shí)等，這些實(shí)現(xiàn)起來(lái)原來(lái)都是相似的芹啥，可以簡(jiǎn)單的設(shè)置一個(gè)定時(shí)器锻离，固定時(shí)間間隔后更新界面，再靈活的使用一下UIBezierPath和CAShapeLayer墓怀，即可得到自己想要的

MCCountingButton.h

#import <UIKit/UIKit.h>

/** 帶倒計(jì)時(shí)的跳過(guò)按鈕
 *  初始化后需設(shè)置總時(shí)長(zhǎng)和間隔時(shí)間
 */
@interface MCCountingButton : UIButton
@property (nonatomic) NSInteger totalTime;//總時(shí)長(zhǎng)汽纠，單位秒
@property (nonatomic) NSInteger tickTockInterval;//計(jì)時(shí)間隔單位，表示兩次計(jì)數(shù)間的時(shí)間間隔傀履，單位毫秒

-(instancetype)initWithFrame:(CGRect)frame;
/**
 *  改變進(jìn)度條末端位置虱朵，循環(huán)調(diào)用實(shí)現(xiàn)進(jìn)度條刷新
 */
-(void)counting;
@end

MCCountingButton.m

//
//  MCCountingView.m
//  MCLaunchAd
//
//  Created by 朱進(jìn)林 on 9/19/16.
//  Copyright ? 2016 Martin Choo. All rights reserved.
//

#import "MCCountingButton.h"

#pragma mark - MCCountingButton
@interface MCCountingButton()
@property (nonatomic, strong) UIBezierPath* path;
@property (nonatomic, strong) CAShapeLayer* backgroundShapeLayer;
@property (nonatomic, strong) CAShapeLayer* shapeLayer;
@end

@implementation MCCountingButton

-(instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        //
        self.totalTime = 6;//默認(rèn)總時(shí)長(zhǎng)6秒
        self.tickTockInterval = 40;//默認(rèn)25下每秒
        [self initialView];
    }
    return self;
}

-(void)initialView
{
    //設(shè)置路徑
    self.path = [UIBezierPath bezierPathWithOvalInRect:self.bounds];
    //灰色底層
    self.backgroundShapeLayer = [CAShapeLayer layer];
    self.backgroundShapeLayer.frame = self.bounds;
    self.backgroundShapeLayer.fillColor = [UIColor clearColor].CGColor;
    self.backgroundShapeLayer.lineWidth = 2.0f;
    self.backgroundShapeLayer.strokeColor = [UIColor lightGrayColor].CGColor;
    self.backgroundShapeLayer.strokeStart = 0.f;
    self.backgroundShapeLayer.strokeEnd = 1.f;
    self.backgroundShapeLayer.path = self.path.CGPath;
    [self.layer addSublayer:self.backgroundShapeLayer];
    //環(huán)形進(jìn)度條，起始點(diǎn)＝終結(jié)點(diǎn)＝0，所以初始化時(shí)不可見(jiàn)
    self.shapeLayer = [CAShapeLayer layer];
    self.shapeLayer.frame = self.bounds;
    self.shapeLayer.fillColor = [UIColor clearColor].CGColor;
    self.shapeLayer.lineWidth = 2.0f;
    self.shapeLayer.lineCap = kCALineCapRound;
    self.shapeLayer.strokeColor = [UIColor colorWithRed:30.0/255.0 green:144.0/255.0 blue:255.0/255.0 alpha:1.0].CGColor;
    self.shapeLayer.strokeStart = 0.0f;
    //通過(guò)不斷修改stroEnd的值碴犬，使形成像動(dòng)畫刷新的效果絮宁，也可以使用CAAnimation的方式，動(dòng)畫的顯示出來(lái)翅敌，duration設(shè)置為你廣告總時(shí)長(zhǎng)就可以
    self.shapeLayer.strokeEnd = 0.0f;
    self.shapeLayer.path = self.path.CGPath;
    [self.layer addSublayer:self.shapeLayer];
    //修正坐標(biāo)軸羞福，逆時(shí)針旋轉(zhuǎn)90度惕蹄，從12點(diǎn)鐘開始倒計(jì)時(shí)
    self.shapeLayer.transform =  CATransform3DRotate(CATransform3DIdentity, M_PI / 2, 0, 0, -1);
    //
    [self setTitle:NSLocalizedString(@"跳過(guò)", nil) forState:UIControlStateNormal];
    [self setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
    self.titleLabel.font = [UIFont systemFontOfSize:10.0];
}

/*改變進(jìn)度條末端位置蚯涮，循環(huán)調(diào)用實(shí)現(xiàn)進(jìn)度條刷新*/
-(void)counting
{
    //strokeEnd的取值范圍是0.0到1.0，所以超出1.0時(shí)截取
    CGFloat unit = self.tickTockInterval/(self.totalTime*1000.0);
    CGFloat f = self.shapeLayer.strokeEnd+unit;
    if (f > 1.0) {
        self.shapeLayer.strokeEnd = 1.0f;
    }else {
        self.shapeLayer.strokeEnd = f;
    }
}
@end