ios-开屏广告图

1.广告页加载思路。广告页的内容要实时显示，在无网络状态或者网速缓慢的情况下不能延迟加载，或者等到首页出现了再加载广告页。所以这里我不采用网络请求广告接口获取图片地址，然后加载图片的方式，而是先将图片异步下载到本地，并保存图片名，每次打开app时先根据本地存储的图片名查找沙盒中是否存在该图片，如果存在，则显示广告页。

2.判断广告页面是否更新。无论本地是否存在广告图片，每次启动都需要重新调用广告接口，根据图片名称或者图片id等方法判断广告是否更新，如果获取的图片名称或者图片id跟本地存储的不一致，则需要重新下载新图片，并删除旧图片。

3.广告页点击。如果点击广告需要跳转广告详情页面，那么广告链接地址也需要用NSUserDefaults存储。注意：广告详情页面是从首页push进去的。

4.广告页的显示代码可以放在AppDeleate中，也可以放在首页的控制器中。如果代码是在AppDelegate中，可以通过发送通知的方式，让首页push到广告详情页。

AppDeleate.m

   //开机广告
    NSString *filePath = [self getFilePathWithImageName:[DXSave Get:adImageName]];
    BOOL isExist = [self isFileExistWithFilePath:filePath];
    if (isExist) {// 图片存在
        AFHTTPSessionManager * manager = [AFHTTPSessionManager manager];
        manager.requestSerializer = [AFJSONRequestSerializer serializer];
        manager.responseSerializer = [AFJSONResponseSerializer serializer];
        NSString *getImageUrl = [H5_SERVER stringByAppendingString:@"admin/ios_open_ads/ios_get_ad"];
        [manager GET:getImageUrl parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            if ([self isFileExistWithFilePath: [self getFilePathWithImageName:responseObject[@"name"]]]){
                NSDateFormatter* df = [[NSDateFormatter alloc] init];
                [df setDateFormat:@"yyyy-MM-dd"];
                NSLocale* locale = [NSLocale autoupdatingCurrentLocale];
                [df setLocale: locale];
                [DXSave Save:@"showTime" with:responseObject[@"show_time"]];
                NSDate* startTime = [df dateFromString: responseObject[@"start_time"]];
                NSDate* endTime = [df dateFromString: responseObject[@"end_time"]];
                NSDate *today = [NSDate date];
                if (([startTime compare:today] == NSOrderedSame || [startTime compare:today] ==NSOrderedAscending)&&
                    ([endTime compare:today] == NSOrderedSame || [endTime compare:today] ==NSOrderedDescending) ){
                    [DXSave Save:@"showAd" with:@"yes"];
                    startAd *advertiseView = [[startAd alloc] initWithFrame:self.window.bounds];
                    advertiseView.filePath =[self getFilePathWithImageName:[DXSave Get:adImageName]];
                    [advertiseView show];
                }
            }
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            [SVProgressHUD showErrorWithStatus:@"网络繁忙, 请稍后再试"];
        }];
   
    }
    // 2.无论沙盒中是否存在广告图片，都需要重新调用广告接口，判断广告是否更新
    [self getAdvertisingImage];

调用方法

/**
 *  判断文件是否存在
 */
- (BOOL)isFileExistWithFilePath:(NSString *)filePath
{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isDirectory = FALSE;
    return [fileManager fileExistsAtPath:filePath isDirectory:&isDirectory];
}

/**
 *  初始化广告页面
 */
- (void)getAdvertisingImage
{
    // TODO 请求广告接口
    AFHTTPSessionManager * manager = [AFHTTPSessionManager manager];
    manager.requestSerializer = [AFJSONRequestSerializer serializer];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];
    NSString *getImageUrl = [H5_SERVER stringByAppendingString:@"admin/ios_open_ads/ios_get_ad"];
    [manager GET:getImageUrl parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSString *imageUrl = responseObject[@"img"];
        NSString *imageName = responseObject[@"name"];
        [DXSave Save:@"showTime" with:responseObject[@"show_time"]];
        NSString *filePath = [self getFilePathWithImageName:imageName];
        BOOL isExist = [self isFileExistWithFilePath:filePath];
        if (!isExist){// 如果该图片不存在，则下载新图片，删除老图片
            [self downloadAdImageWithUrl:imageUrl imageName:imageName url:responseObject[@"url"]];
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
//        [SVProgressHUD showErrorWithStatus:@"网络繁忙, 请稍后再试"];
    }];
    
}
/**
 *  下载新图片
 */
- (void)downloadAdImageWithUrl:(NSString *)imageUrl imageName:(NSString *)imageName url:(NSString*)url
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]];
        UIImage *image = [UIImage imageWithData:data];
        NSString *filePath = [self getFilePathWithImageName:imageName]; // 保存文件的名称
        [DXSave Save:@"adPath" with:filePath];
        if ([UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES]) {// 保存成功
            NSLog(@"保存成功");
            [self deleteOldImage];
            [DXSave Save:adImageName with:imageName];
            [DXSave Save:adImageUrl with:url];
        }else{
            NSLog(@"保存失败");
        }
        
    });
}

/**
 *  删除旧图片
 */
- (void)deleteOldImage
{
    NSString *imageName = [DXSave Get:adImageName];
    if (imageName) {
        NSString *filePath = [self getFilePathWithImageName:imageName];
        NSFileManager *fileManager = [NSFileManager defaultManager];
        [fileManager removeItemAtPath:filePath error:nil];
    }
}

/**
 *  根据图片名拼接文件路径
 */
- (NSString *)getFilePathWithImageName:(NSString *)imageName
{
    if (imageName) {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES);
        NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:imageName];
        return filePath;
    }
    return nil;
}

广告页面（uiView）

startAd.m


#import "startAd.h"

@interface startAd()
@property (nonatomic, strong) UIImageView *adView;

@property (nonatomic, strong) UIButton *countBtn;

@property (nonatomic, strong) NSTimer *countTimer;

@property (nonatomic, assign) int count;

@end

@implementation startAd

- (NSTimer *)countTimer
{
    if (!_countTimer) {
        _countTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countDown) userInfo:nil repeats:YES];
    }
    return _countTimer;
}

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        
        // 1.广告图片
        _adView = [[UIImageView alloc] initWithFrame:frame];
        _adView.userInteractionEnabled = YES;
        _adView.image = [UIImage imageWithContentsOfFile:_filePath];
        _adView.contentMode = UIViewContentModeScaleAspectFill;
        _adView.clipsToBounds = YES;
        if(![[DXSave Get:@"adImageUrl"] isEqualToString:@""]){
            UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(pushToAd)];
            [_adView addGestureRecognizer:tap];
        }
        
        // 2.跳过按钮
        CGFloat btnW = 60;
        CGFloat btnH = 30;
        _countBtn = [[UIButton alloc] initWithFrame:CGRectMake(SCREEN_WIDTH - btnW - 24, btnH, btnW, btnH)];
        [_countBtn addTarget:self action:@selector(dismiss) forControlEvents:UIControlEventTouchUpInside];
        [_countBtn setTitle:[NSString stringWithFormat:@"跳过%d", [[DXSave Get:@"showTime"] intValue]] forState:UIControlStateNormal];
        _countBtn.titleLabel.font = [UIFont systemFontOfSize:15];
        [_countBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        _countBtn.backgroundColor = [UIColor colorWithRed:38 /255.0 green:38 /255.0 blue:38 /255.0 alpha:0.6];
        _countBtn.layer.cornerRadius = 4;
        
        [self addSubview:_adView];
        [self addSubview:_countBtn];
        
    }
    return self;
}

- (void)setFilePath:(NSString *)filePath
{
    _filePath = filePath;
    _adView.image = [UIImage imageWithContentsOfFile:filePath];
}

- (void)pushToAd{
    [self dismiss];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"pushtoad" object:nil userInfo:nil];
}

- (void)countDown
{
    _count --;
    [_countBtn setTitle:[NSString stringWithFormat:@"跳过%d",_count] forState:UIControlStateNormal];
    if (_count == 0) {
        [self dismiss];
    }
}

- (void)show
{
    // 倒计时方法：定时器
    [self startTimer];
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    [window addSubview:self];
}

// 定时器倒计时
- (void)startTimer
{
    _count = [[DXSave Get:@"showTime"] intValue];
    [[NSRunLoop mainRunLoop] addTimer:self.countTimer forMode:NSRunLoopCommonModes];
}

// GCD倒计时
- (void)startCoundown
{
    __block int timeout = [[DXSave Get:@"showTime"] intValue] + 1; //倒计时时间 + 1
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);
    dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0 * NSEC_PER_SEC, 0); //每秒执行
    dispatch_source_set_event_handler(_timer, ^{
        if(timeout <= 0){ //倒计时结束，关闭
            dispatch_source_cancel(_timer);
            dispatch_async(dispatch_get_main_queue(), ^{
                [self dismiss];
            });
        }else{
            dispatch_async(dispatch_get_main_queue(), ^{
                [_countBtn setTitle:[NSString stringWithFormat:@"跳过%d",timeout] forState:UIControlStateNormal];
            });
            timeout--;
        }
    });
    dispatch_resume(_timer);
}

// 移除广告页面
- (void)dismiss
{
    [self.countTimer invalidate];
    self.countTimer = nil;
    
    [UIView animateWithDuration:0.3f animations:^{
        self.alpha = 0.f;
    } completion:^(BOOL finished) {
        [self removeFromSuperview];
    }];
    
}


@end

startAd.h


#import <UIKit/UIKit.h>
#define kUserDefaults [NSUserDefaults standardUserDefaults]
static NSString *const adImageName = @"adImageName";
static NSString *const adImageUrl = @"adImageUrl";
static NSString *const adUrl = @"adUrl";
@interface startAd : UIView

/** 显示广告页面方法*/
- (void)show;
/** 图片路径*/
@property (nonatomic, copy) NSString *filePath;

@end

最后首页加跳转链接

- (void)viewDidLoad {
   [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pushToAd) name:@"pushtoad" object:nil];
}

- (void)pushToAd {
    loadUrlViewController *adVc = [[loadUrlViewController alloc] init];
    adVc.currentRoute = [DXSave Get:@"adImageUrl"];
    [self.navigationController pushViewController:adVc animated:YES];
}