启动图广告思路

1、在AppDelegate启动方法中切换根控制器为广告展示控制器

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    ADVC *vc = [[ADVC alloc] init];
    self.window.rootViewController = vc;
    return YES;
}

2、广告图控制器

#import "ADVC.h"

@interface ADVC ()

@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIButton *skipButton;
@property (strong, nonatomic) NSTimer *skipTimer;

@end

static NSInteger kSkipTimeout = 5;
static NSString *const kNeedShowADYES = @"YES";
static NSString *const kNeedShowADKey = @"isNeedShowAD";
static NSString *const kADImagePathKey = @"ADImagePath";

@implementation ADVC

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupADImage];
}

#pragma mark - UI交互

- (IBAction)skipButtonClicked:(id)sender {
    [self endADShow];
}

- (IBAction)ADButtonClicked:(id)sender {
    // 用 NSUserDefaults 配置值来标识用户在广告业是否点击了广告,此方法比采用通知的方法更稳定
    [[NSUserDefaults standardUserDefaults] setValue:kNeedShowADYES forKey:kNeedShowADKey];
    [[NSUserDefaults standardUserDefaults] synchronize];
    [self endADShow];
}

#pragma mark - UI设置

- (void)setupADImage {
    NSString *imagePath = (NSString *)[[NSUserDefaults standardUserDefaults] valueForKey:kADImagePathKey];
    UIImage *image = [UIImage imageWithContentsOfFile:imagePath];
    if (image) {
        self.imageView.image = image;
        [self setupSkipButtonTitle];
        self.skipButton.hidden = NO;
        // 开启倒计时
        self.skipTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(skipTimerAction) userInfo:nil repeats:YES];
    }else{
        [self endADShow];
    }
}

- (void)setupSkipButtonTitle {
    NSString *title = [NSString stringWithFormat:@"%ldS 跳过", kSkipTimeout];
    [self.skipButton setTitle:title forState:UIControlStateNormal];
}

#pragma mark - otherMethods

- (void)skipTimerAction {
    if (kSkipTimeout >= 0) {
        [self setupSkipButtonTitle];
        kSkipTimeout -= 1;
        return;
    }
    [self endADShow];
}

- (void)endADShow {
    [self.skipTimer invalidate];
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UITabBarController *tabBarVC = [mainStoryboard instantiateViewControllerWithIdentifier:@"tabbarvc"];
    [UIApplication sharedApplication].delegate.window.rootViewController = tabBarVC;
}


@end

3、在需要启动广告业详情的控制器中

#import "ViewController.h"
#import "ADDetailsVC.h"

@interface ViewController ()

@end

static NSString *const kNeedShowADKey = @"isNeedShowAD";
static NSString *const kADImagePathKey = @"ADImagePath";
static NSString *const kADImageName = @"launchImageName";

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)viewDidAppear:(BOOL)animated {
    // 检查是否有点击广告,如有则打开广告详情页并删除有点击广告的标记
    if ([[NSUserDefaults standardUserDefaults] valueForKey:kNeedShowADKey]) {
        ADDetailsVC *vc = [[ADDetailsVC alloc] init];
        [self.navigationController pushViewController:vc animated:YES];
        [[NSUserDefaults standardUserDefaults] removeObjectForKey:kNeedShowADKey];
    }
    
    // 无论如何都在此重新加载广告信息,并存储广告图片和广告链接,还要记得删除旧的图片(这步其实可以交给SDWebImage)
    NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://pic143.nipic.com/file/20171016/3046502_091455265001_2.jpg"]];
    NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *path = (NSString *)[filePaths objectAtIndex:0];
    NSString *imageSavePath = [path stringByAppendingPathComponent:kADImageName];
    [imageData writeToFile:imageSavePath atomically:YES];
    // 存储图片路径
    [[NSUserDefaults standardUserDefaults] setValue:imageSavePath forKey:kADImagePathKey];
}


@end

4、注意在启动广告详情的控制器中，最好把push详情控制器放在 - (void)viewDidAppear:(BOOL)animated 方法中，避免转场动画冲突造成push不成功。