iOS 启动页后广告Demo

重点！

对于启动页后的广告，相信大家也都看到过很多很多的，比如我自己常看到的有 QQ音乐，爱奇艺了。你点击了APP，它会启动就会随之启动。。其实这些APP的启动页是没有消失的，你去认真的观察一下！所以它们的顺序就变成了点击 —> 启动页 —> 广告下面是我截的QQ音乐的顺序图。不知道怎么弄GIF图。😊

为什么说这是重点呢，可能有些小伙伴会误以为使用广告替代了启动页，但启动页怎样做成一个广告呢，还要加一些点击时间之类的，很是不懂！现在就清楚了，至少知道它的一个流程才会有思路的。

还有一点，这个广告是缓存了的，你试着启动几次，它会给你不同的启动广告的，完事了，你把你的4G和Wifi都关掉，然后再去启动相应的APP，广告依旧是会出现的。。

一个思路：

这里我说我的一个思路：

1：把广告先封装到一个View当中去，然后把它加载到一个控制器当中显示，因为涉及到缓存和隐藏导航和标签栏的状况。

2：在 APPDelegate 的 didFinishLaunchingWithOptions 中进行一个根视图的切换（同志们看了下面代码分析要觉得有问题，欢迎指正）。

这里是广告View的.m文件代码：

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#import "AdvertisingView.h"
#import "UIImageView+WebCache.h"
@interface AdvertisingView()
 
@property(nonatomic,strong) UIImageView * advertisingView;
@property(nonatomic,strong) UIButton * advertisingJumpButton;
@property(nonatomic,strong) UILabel * timeLabel;
@property(nonatomic,assign) int secondsCountDown;
@property(nonatomic,strong) NSTimer * countDownTimer;
/** 定时器(这里不用带*，因为dispatch_source_t就是个类，内部已经包含了*) */
@property (nonatomic, strong) dispatch_source_t timer;
 
@end
@implementation AdvertisingView
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/
-(instancetype) initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self addSubview:self.advertisingView];
        [self addSubview:self.advertisingJumpButton];
        [self addSubview:self.timeLabel];
    }
    return self;
}
-(void)startplayAdvertisingView:(void (^)(AdvertisingView *))advertisingview
{
    [[UIApplication sharedApplication].keyWindow addSubview:self];    
    [[UIApplication sharedApplication].keyWindow bringSubviewToFront:self];
    // 这里的block advertisingview ;
    // advertisingview(); 你要调用就要传参数过去，调用的具体代码在 APPdelegate 里面调用的时候添加这个 block具体的代码、、、
    __block int count = 3;
    // 获得队列
    dispatch_queue_t queue = dispatch_get_main_queue();
    // 创建一个定时器(dispatch_source_t本质还是个OC对象)
    self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
    // 设置定时器的各种属性（几时开始任务，每隔多长时间执行一次）
    // GCD的时间参数，一般是纳秒（1秒 == 10的9次方纳秒）
    // 何时开始执行第一个任务
    // dispatch_time(DISPATCH_TIME_NOW, 1.0 * NSEC_PER_SEC) 比当前时间晚3秒
    dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC));
    uint64_t interval = (uint64_t)(1.0 * NSEC_PER_SEC);
    dispatch_source_set_timer(self.timer, start, interval, 0);
    // 设置回调
    dispatch_source_set_event_handler(self.timer, ^{
        /**
         *  回主线程更新UI
         */
        count--;
        dispatch_async(dispatch_get_main_queue(), ^{
             
            if (count == 0) {
                // 取消定时器
                dispatch_cancel(self.timer);
                self.timer = nil;
                [self removeFromSuperview];
                /**
                 *  广告显示完，就调用 block 更换 rootcontroller
                 */
                advertisingview(self);   
            }
            else{
                _timeLabel.text = [NSString  stringWithFormat:@"%d",count];}
        });
    });
    // 启动定时器
    dispatch_resume(self.timer);
}
-(UIImageView * )advertisingView
{
    if (_advertisingView == nil) {   
        _advertisingView =[[UIImageView  alloc]initWithFrame:self.bounds];
        [_advertisingView sd_setImageWithURL:[NSURL URLWithString:@"http://g.hiphotos.baidu.com/zhidao/pic/item/f2deb48f8c5494ee665ec00f29f5e0fe99257eac.jpg"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {      
        }];
    }  
    return _advertisingView;
}
-(UILabel * )timeLabel
{ 
    if (_timeLabel == nil) {
         
        _timeLabel = [[UILabel alloc]initWithFrame:CGRectMake(self.bounds.size.width - 50, 50, 50, 40)];
        _timeLabel.backgroundColor =[UIColor blackColor];
        _timeLabel.alpha = 0.5;
        _timeLabel.textColor = [UIColor whiteColor];  
    }  
    return _timeLabel;
}
-(UIButton * )advertisingJumpButton
{
    if (_advertisingJumpButton == nil) {       
        _advertisingJumpButton = [UIButton buttonWithType:UIButtonTypeCustom];
        _advertisingJumpButton.frame =  CGRectMake(0, self.bounds.size.height - 80, self.bounds.size.width, 60);
        [_advertisingJumpButton setTitle:@"了解详情" forState:UIControlStateNormal];
        [_advertisingJumpButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [_advertisingJumpButton addTarget:self action:@selector(buttonclick) forControlEvents:UIControlEventTouchUpInside];
        _advertisingJumpButton.titleLabel.font = [UIFont systemFontOfSize:18];
        _advertisingJumpButton.backgroundColor = [UIColor blackColor];
        _advertisingJumpButton.alpha = 0.5;
        _advertisingJumpButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
        _advertisingJumpButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    }  
    return _advertisingJumpButton;
}
-(void)buttonclick
{
}
@end

下面是添加这个View的控制器的.m文件：

#import "AdvertisingViewController.h"
@interface AdvertisingViewController ()
@end
@implementation AdvertisingViewController
/**
 *   可以在这个控制器里面做缓存？爱奇艺，QQ音乐的广告是缓存了的！
 */
-(void)viewWillAppear:(BOOL)animated
{   
    [self setNeedsStatusBarAppearanceUpdate];
}
- (BOOL)prefersStatusBarHidden {  
    return YES;
}
-(void)viewDidLoad {  
    [super viewDidLoad];  
    [self.view addSubview:self.adverView];  
}
-(AdvertisingView *)adverView
{  
    if (_adverView == nil) {      
        _adverView = [[ AdvertisingView alloc]initWithFrame:self.view.bounds];     
    }
    return _adverView;
}
-(void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

最重要的下面！！

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    /**
     *  进来先让启动页沉睡 2 秒钟
     */
    [NSThread sleepForTimeInterval:2.0]; 
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];
  
    AdvertisingViewController * adviewcontroller = [[AdvertisingViewController  alloc]init];
    ZXTabBarController * tabbarcontroller = [[ZXTabBarController alloc]init];
    // 这里要添加根控制器，不添加等下面添加是不行的。
    self.window.rootViewController = adviewcontroller ;
    [self.window makeKeyAndVisible];
    [adviewcontroller.adverView startplayAdvertisingView:^(AdvertisingView * adverview) {
       // 更换根控制器
        self.window.rootViewController = tabbarcontroller;
         
    }];
    // Override point for customization after application launch.
    return YES;
 
} 