我正在运行didcompletewitherror我用来下载本地托管的XML文件：url - http://10.232.254.59/catalogue.xml
问题在于我使用网址 - http://10.232.254.59/catalogue.x或
url - http://10.232.254.59/catal或任何其他组合而不更改IP，// MainViewController.m
@interface MainViewController ()
{
NSURLSessionDownloadTask *download;
}
@property(nonatomic,strong)NSURLSession *backgroundSession;
- (void)viewDidLoad {
NSURLSessionConfiguration *ConfigurationObject = [NSURLSessionConfiguration defaultSessionConfiguration];
ConfigurationObject.timeoutIntervalForRequest = 10.0;
ConfigurationObject.timeoutIntervalForResource = 10.0;
self.backgroundSession = [NSURLSession sessionWithConfiguration:ConfigurationObject delegate:self delegateQueue:nil];
[self LoadMediaUrl_StartTask_StartActivityIndicator];
}
-(void)LoadMediaUrl_StartTask_StartActivityIndicator{
NSURL *url ;
url = [self mediaUrlFromSettings];
if(url.absoluteString.length != 0){
download = [self.backgroundSession downloadTaskWithURL:url];
[download resume];
--do more stuff---
}
}
- (void)URLSession:(NSURLSession *)session downloadTask:(nonnull NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(nonnull NSURL *)location{
NSLog(@"didFinishDownloadingToURL called");
NSFileManager *fileManager = [NSFileManager defaultManager];
dispatch_async(dispatch_get_main_queue(), ^{
*** start the parser ***
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Success" message:[NSString stringWithFormat:@" Catalogue Download Success! Press OK to Load New Media List."] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"cancel", nil];
alert.tag = ALERT_VIEW_DOWNLOAD_SUCCESS;
[alert show];
});
-(void)URLSession:(NSURLSession *)session task:(nonnull NSURLSessionTask *)task didCompleteWithError:(nullable NSError *)error
{
NSLog(@"didCompleteWithError error : %@",[error localizedDescription]);
if(error != nil){
dispatch_async(dispatch_get_main_queue(), ^{
[self.downloadActivityIndicator stopAnimating];
[self.downloadProgressView setHidden:YES];
self.DownloadImageView.alpha = 1.0;
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error" message:[NSString stringWithFormat:@" Catalogue Download Failed ! %s%@","\n",[error localizedDescription]] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Retry", nil];
alert.tag =ALERT_VIEW_DOWNLOAD_FAILED;
[alert show];
});
}
download = nil;
}
委托给我错误=（null）。
didCompleteWithError我在更改IP时didFinishDownloadingToURL出现错误但在更改IP / *时没有，因此即使出现错误的网址，也会显示下载成功提示。
即使在网址不好的情况下，我也会收到LoadMediaUrl_StartTask_StartActivityIndicator代表电话
我在几个地方调用<body>
<div class="fadeInDown">
I want this to appear centered, from the top and over all my content
</div>
<div id='content'>
...much complex html layout...bootstrap...wow
</div>
</body>
并使用相同的backgroundSession obj。
有谁能告诉我可能是什么原因？
答案 0 :(得分：0)
我想我得到了原因 URLSession didCompleteWithError nil error
它因为它只报告客户端错误，但不确定这种风格如何符合服务器问题。
答案 1 :(得分：0)
要检测服务器错误（例如404），请实现didReceiveResponse委托方法。从那里，检查NSHTTPURLResponse对象中的httpStatusCode属性。您必须首先将NSURLResponse强制转换为NSHTTPURLResponse指针。