注意：我已经检查了这个问题,其中的问题与多次加载相同的内容有关.
NSURLProtocol isn’t asked to load after YES response to canInitWithRequest
实际页面在我的自定义NSURLProtocol中加载很好,它从canInitWithRequest返回YES(几次),然后在大约第4或第5次后调用startLoading.然后它以类似的方式加载我的css文件.然后我看到我的视频对象的请求从canInitWithRequest返回YES,但没有任何反应.永远不会为我的视频资源请求调用startLoading.这是我加载页面时设备的简化日志：
canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL START LOADING: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://cssResource START LOADING: https://cssResource canInitWithRequest: https://MyVideoResource
当我从完全相同的设备类型运行相同iOS版本的模拟器加载完全相同的页面时,日志显示资源实际上由于某种原因开始加载：
canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://WebpageURL START LOADING: https://WebpageURL canInitWithRequest: https://WebpageURL canInitWithRequest: https://cssResource START LOADING: https://cssResource canInitWithRequest: https://MyVideoResource canInitWithRequest: https://MyVideoResource START LOADING: https://MyVideoResource -- WHY NOT ON DEVICE?
该页面留下了一个永远不会播放的视频 – 只有一个白色的盒子,它上面有“播放视频”按钮.页面看起来像是不断加载某些东西(状态栏中的活动指示器正在旋转)但没有发生任何事情,并且Xcode的Debug导航器中的网络活动是扁平化的.
TL;博士
有谁知道为什么从未在我的iPhone上尝试加载此资源？显然,模拟器知道它需要加载.
编辑：这是来自我的NSURLProtocol的略微编辑的相关代码
@implementation CHHTTPURLProtocol
{
NSURLConnection *connection;
NSHTTPURLResponse *httpResponse;
NSData *responseData;
}
+ (BOOL)canInitWithRequest:(NSURLRequest *)request
{
if (/* key exists on request */)
return NO;
else if (/* not http or https */)
return NO;
NSLog(@"canInitWithRequest: %@",request.URL.absoluteString);
return YES;
}
+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request
{
return request;
}
- (void)startLoading
{
NSMutableURLRequest *request = [self.request mutableCopy];
NSLog(@"START LOADING: %@",request.URL.absoluteString);
if (authenticate) authenticate(request);
/* add key to request */
connection = [NSURLConnection connectionWithRequest:request delegate:self];
}
- (void)stopLoading
{
[connection cancel];
connection = nil;
}
/* Other methods like connection:didReceiveData: and connectionDidFinishLoding: */
+ (void)authenticateWithBlock:(AuthenticationBlock)block
{
authenticate = block;
}
static AuthenticationBlock authenticate;
解决方法
实现可能因模拟器而异.
我得到你的协议使用canInitWithRequest调用进行轮询,但这并不一定意味着玩家将使用NSURLSession / NSURLRequest实际加载资源.
尝试通过自定义协议将视频加载到MPMoviePlayerViewController中的行为与您所看到的类似：How to play movie with a URL using a custom NSURLProtocol?
