iOS從url下載html文件

Question

我需要從服務器url下載html文件並替換爲本地html文件。我正在使用AFNetworking下載文件並存儲到Documents文件夾。它正在下載視頻&音頻文件。但是，當我嘗試下載HTML文件我得到以下錯誤Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x83d0730 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder 
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"solarhtml"]; 

if ([[NSFileManager defaultManager] fileExistsAtPath:dataPath]) 
[[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error]; 

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; 

[manager.requestSerializer setValue:@"application/x-www-form-urlencoded" 
forHTTPHeaderField:@"Content-Type"]; 

[manager setResponseSerializer:[AFJSONResponseSerializer serializer]]; 
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/html", nil]; 


[manager GET:@"http://server.net/projects/index.html" 
parameters:nil 
success:^(AFHTTPRequestOperation *operation, id responseObject) { 
[operation.responseData writeToFile:[dataPath stringByAppendingPathComponent:@"index.html"] atomically:YES]; 


NSLog(@"Successfully downloaded file to %@", [NSURL fileURLWithPath:dataPath]); 
NSLog(@"THE RESPONSE: %@", responseObject); 


} 
failure:^(AFHTTPRequestOperation *operation, NSError *error1) { 
NSLog(@"%@", error1); 
}]; 

訪問HTML文件：

-(void)estimatesavings:(id)sender{ 


     if(updateclick==YES){ 

     web_estimate=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 1024, 768)]; 

     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
     NSString *documentsDirectory = [paths objectAtIndex:0]; 
     NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"index.html"]; 

     NSURL *targetURL = [NSURL fileURLWithPath:filePath]; 
     NSURLRequest *request = [NSURLRequest requestWithURL:targetURL]; 
     [web_estimate loadRequest:request]; 

     web_estimate.delegate=self; 

     [self.view addSubview:web_estimate]; 

    }else{ 


    NSString *pathToBundle = [[NSBundle mainBundle] bundlePath]; 
    NSURL *baseURL = [NSURL fileURLWithPath:pathToBundle]; 
    NSString *htmlFile = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"]; 
    NSString *htmlString = [NSString stringWithContentsOfFile:htmlFile encoding:NSUTF8StringEncoding error:nil]; 
    //CGRect fullScreenRect=[[UIScreen mainScreen]applicationFrame]; 
    web_estimate=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 1024, 768)]; 
    [web_estimate loadHTMLString:htmlString baseURL:baseURL]; 



    web_estimate.delegate=self; 
    [self.view addSubview:web_estimate]; 

    } 


    } 

錯誤：

copy failed: Error Domain=NSCocoaErrorDomain Code=4 "The operation couldn’t be completed. (Cocoa error 4.)" UserInfo=0x83c8b50 {NSSourceFilePathErrorKey=/Users/ranganathagv/Library/Application Support/iPhone Simulator/6.1/Applications/CEDFEBEB-2A5C-40A9-8965-761689FD83C2/ActewAGL.app/index.html, NSUserStringVariant=(
    Copy 
), NSFilePath=/Users/ranganathagv/Library/Application Support/iPhone Simulator/6.1/Applications/CEDFEBEB-2A5C-40A9-8965-761689FD83C2/ActewAGL.app/index.html, NSDestinationFilePath=/Users/ranganathagv/Library/Application Support/iPhone Simulator/6.1/Applications/CEDFEBEB-2A5C-40A9-8965-761689FD83C2/Documents/solarhtml/index.html, NSUnderlyingError=0x83c89c0 "The operation couldn’t be completed. No such file or directory"}c 

Answer 1

有兩個問題：

1. 嘗試使用AFJSONResponseSerializer並更改acceptableContentTypes將不起作用，因爲AFJSONResponseSerializer將接受響應，但仍會嘗試解析JSON。相反，您應該只使用AFHTTPResponseSerializer。有關更多信息，請參閱https://stackoverflow.com/a/21621530/1271826。

2. 另一個問題在於你打開的例程。而不是隻從包中打開文件，您應該打開文件夾中的文件。您甚至可能希望將該文件從該文件夾複製到Documents文件夾（以防尚未下載）。

   例如：

   NSString *documentsFolder = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; 
   NSString *solarFolder  = [documentsFolder stringByAppendingPathComponent:@"solarhtml"]; 
   NSString *documentsPath = [solarFolder stringByAppendingPathComponent:@"index.html"]; 
   NSString *bundlePath  = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"]; 
   
   NSFileManager *fileManager = [NSFileManager defaultManager]; 
   
   if (![fileManager fileExistsAtPath:documentsPath]) { 
       NSError *error; 
       if (![fileManager fileExistsAtPath:solarFolder]) { 
        if (![fileManager createDirectoryAtPath:solarFolder withIntermediateDirectories:YES attributes:nil error:&error]) { 
         NSLog(@"create folder failed: %@", error); 
        } 
       } 
       if (![fileManager copyItemAtPath:bundlePath toPath:documentsPath error:&error]) { 
        NSLog(@"copy failed: %@", error); 
       } 
   } 
   
   NSString *htmlString = [NSString stringWithContentsOfFile:documentsPath encoding:NSUTF8StringEncoding error:nil]; 
   web_estimate=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 1024, 768)]; 
   [web_estimate loadHTMLString:htmlString baseURL:baseURL]; 
   

   這樣，如果該文件尚未在所有下載，這將文件從包試圖在必要時打開它，之前複製。