html - Link to css file in documents from UIWebView without using Base Path -

i have loaded html string (after downloading css file documents) this:

/* result html file references local resources  <link href="file:///users/user/library/developer/coresimulator/devices/123/data/containers/data/application/123/documents/gen1.css" rel="stylesheet" type="text/css">  , external resources  <link href="http://api.tiles.mapbox.com/mapbox.js/v1.6.4/mapbox.css" rel="stylesheet" />  */ pagegenerator *generator = [pagegenerator sharedgenerator]; nsstring *result = [generator generatepagewithoptions:options]; // filesdir file:// + [[[nsfilemanager defaultmanager] urlsfordirectory:nsdocumentdirectory indomains:nsuserdomainmask] lastobject] + / [self.webview loadhtmlstring:result baseurl:[nsurl urlwithstring:[generator filesdir]]]; 

now, problem external resources contain url's "//www.site.com/img.png" , uiwebview rewrites them "file://www.site.com/img.png", , gets 404 error.

how can access local resource without need set base url? or how can rewrite "//" "http://" instead "file://"?

thanks lot.

what want install custom nsurlprotocol creating class subclasses nsurlprotocol type , implements nsurlconnectiondelegate , registering using [nsurlprotocol registerclass:[myurlprotocol class]];

this comprehensive tutorial on doing want do.

anytime webview makes request asset, css file or image, it's going call + (bool)caninitwithrequest:(nsurlrequest *)request request. can inspect nsurlrequest see if asset has scheme using [request.url.scheme isequaltostring:@"file']. in scenario, can return yes protocol delegate can take on request.

you'll want override url used however, (or @ least result of happens it).

i think should able use this:

- (void)startloading {     nsurlrequest* defaultrequest = self.request; // request file://...     nsmutableurlrequest* request = [defaultrequest mutablecopy];     // change url or whatever want on request here.     self.connection = [nsurlconnection connectionwithrequest:request delegate:self]; } 

if doesn't work, can @ changing + (nsurlrequest *)canonicalrequestforrequest:(nsurlrequest *)request return modified request. note result returned should identical given request ios caching mechanisms use nsurlrequest return.

you can add in rest of code shown in link above delegate:

+ (nsurlrequest *)canonicalrequestforrequest:(nsurlrequest *)request {     return request; }  + (bool)requestiscacheequivalent:(nsurlrequest *)a torequest:(nsurlrequest *)b {     return [super requestiscacheequivalent:a torequest:b]; }  - (void)stoploading {     [self.connection cancel];     self.connection = nil; }  - (void)connection:(nsurlconnection *)connection didreceiveresponse:(nsurlresponse *)response {     [self.client urlprotocol:self didreceiveresponse:response cachestoragepolicy:nsurlcachestoragenotallowed]; }  - (void)connection:(nsurlconnection *)connection didreceivedata:(nsdata *)data {     [self.client urlprotocol:self didloaddata:data]; }  - (void)connectiondidfinishloading:(nsurlconnection *)connection {     [self.client urlprotocoldidfinishloading:self]; }  - (void)connection:(nsurlconnection *)connection didfailwitherror:(nserror *)error {     [self.client urlprotocol:self didfailwitherror:error]; } 

this example has overridden image requests return pictures of david hasselhoff.

this mechanism powerful. instance, use theme app substituting every css file requested @ runtime without changing html.