APP给HTML做缓存

// 检查本地缓存
    NSArray *arrayOfCache =NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);
    NSString *cachesPath = [arrayOfCache objectAtIndex:0];
// 首页HTML缓存路径   static NSString *const HTML_CACHE_PATH = @"homeHtml.html";
    NSString *HTMLCachePath = [cachesPath stringByAppendingPathComponent:HTML_CACHE_PATH];
//判断是否存在该路径
    BOOL hasCache = [[NSFileManager defaultManager] fileExistsAtPath:HTMLCachePath];
    if (hasCache) {
        NSString *htmlStr = [[NSString alloc] initWithContentsOfFile:HTMLCachePath encoding:NSUTF8StringEncoding error:nil];
        [self.webView loadHTMLString:htmlStr baseURL:nil];
        // 判断缓存是否需要更新
        NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
        NSTimeInterval lastDateInterval = [userDefault doubleForKey:HTML_CACHE_DATE_KEY];
        NSTimeInterval timeInterval = [[NSDate date] timeIntervalSince1970] - lastDateInterval;
        NSTimeInterval hourInterval = 60 * 60;
        if (timeInterval > 2 * hourInterval) {
            [self cacheHTMLFileWithCallBack:^(BOOL success) {
                
            }];
        }
    }else {
        // load request
        NSString *urlStr = [kBaseH5 stringByAppendingString:@"/h5/appProject/appIndex/index.html"];
        //urlStr = @"http://192.168.1.116/appProject/appIndex/index.html";
        NSURL *url = [NSURL URLWithString:urlStr];
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        [self.webView loadRequest:request];
        
        [self cacheHTMLFileWithCallBack:^(BOOL success) {
            
        }];
    }

- (void)cacheHTMLFileWithCallBack:(void(^)(BOOL success))callBack {
    // load request
    NSString *urlStr = [kBaseH5 stringByAppendingString:@"/h5/appProject/appIndex/index.html"];
    //urlStr = @"http://192.168.1.116/appProject/appIndex/index.html";
    NSURL *url = [NSURL URLWithString:urlStr];
    
    dispatch_queue_t concurrentQueue = dispatch_queue_create("cocurrentQueue", DISPATCH_QUEUE_CONCURRENT);
    dispatch_async(concurrentQueue, ^{
        NSError *error = nil;
        NSString *htmlStr = [[NSString alloc] initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];
        if (!error) {
            NSLog(@"下载成功");
            NSArray *arrayOfCache =NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);
            NSString *cachesPath = [arrayOfCache objectAtIndex:0];
            NSString *HTMLCachePath = [cachesPath stringByAppendingPathComponent:HTML_CACHE_PATH];
            NSError *error = nil;
            [htmlStr writeToFile:HTMLCachePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
            if (!error) {
                NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
                [userDefault setDouble:[[NSDate date] timeIntervalSince1970] forKey:HTML_CACHE_DATE_KEY];
                callBack(YES);
            }
        }
    });
}

Snip20170712_1.png