ios - Trouble loading html file in webview of detailview using plist and tableviw -

• i have a1.html, a2.html, b1.html, b2.html local resources within app.
• i having trouble loading these html files using plist , tableview detailview's webview

plist

topics.plist

<?xml version="1.0" encoding="utf-8"?> <!doctype plist public "-//apple//dtd plist 1.0//en"     "http://www.apple.com/dtds/propertylist-1.0.dtd"> <plist version="1.0"> <dict> <key>hn</key> <array>     <dict>         <key>name</key>         <string>boston</string>         <key>file</key>         <string>a1</string>     </dict>     <dict>         <key>name</key>         <string>massachussets</string>         <key>file</key>         <string>a2</string>     </dict> </array> <key>lea</key> <array>     <dict>         <key>name</key>         <string>birmingham</string>         <key>file</key>         <string>b1</string>     </dict>     <dict>         <key>name</key>         <string>alabama</string>         <key>file</key>         <string>b2</string>     </dict> </array> 

tableview

topicstableviewcontroller.m

#import "topicstableviewcontroller.h" #import "topicdisplayviewcontroller.h"   #define hnsection 0 #define leasection 1  #define numberofsections 2  @interface topicstableviewcontroller () @property (nonatomic, retain) nsmutabledictionary *topicslist;  @end  @implementation topicstableviewcontroller  @synthesize topicslist;  - (id)initwithstyle:(uitableviewstyle)style   { self = [super initwithstyle:style]; if (self) {     // customize initiation } return self; }  - (void)viewdidload {  [super viewdidload];  nsstring *plistpath = [[nsbundle mainbundle] pathforresource:@"topics" oftype:@"plist"]; topicsdict = [[nsdictionary alloc] initwithcontentsoffile:plistpath];   self.hnarray = topicsdict[@"hn"]; self.leaarray= topicsdict[@"lea"];       }   - (nsstring *)tableview:(uitableview *)tableview titleforheaderinsection:  (nsinteger)section {   switch (section){    case hnsection:      return @"northeast";   break;  case leasection:      return @"south";  break;   default:      return 0;  }     }    // customize number of rows in table view.   - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section    {  switch (section) {     case hnsection:         return [self.hnarray count];         break;     case leasection:         return [self.leaarray count];         break;     default:         return 0;      }   }  // customize appearance of table view cells.   - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {      static nsstring *cellidentifier = @"cell";       uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];     switch (indexpath.section)     {     case hnsection:       cell.textlabel.text = self.hnarray[indexpath.row][@"name"];         break;     case leasection:          cell.textlabel.text = self.leaarray[indexpath.row][@"name"];         break;     default:         return 0; } cell.accessorytype=uitableviewcellaccessorydisclosureindicator; return cell;    }   - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath  *)indexpath {      topicdisplayviewcontroller*destinationcontroller ;     nsstring*file;      switch (indexpath.section)     {                case hnsection:             file = [[nsstring alloc] initwithformat:@"%@", self.hnarray[indexpath.row][@"file"]];             destinationcontroller.htmlfile  =  self.hnarray[indexpath.row][@"file"];              break;         case leasection:               file = [[nsstring alloc] initwithformat:@"%@", self.leaarray[indexpath.row][@"file"]];             destinationcontroller.htmlfile  =  self.leaarray[indexpath.row][@"file"];             break;      }  }   - (void)tableview:(uitableview *)tableview accessorybuttontappedforrowwithindexpath:   (nsindexpath *)indexpath { [self tableview:tableview didselectrowatindexpath:indexpath];  }   @end 

deatailview

topicdisplayviewcontroller.h

#import <uikit/uikit.h> @interface topicdisplayviewcontroller : uiviewcontroller {     iboutlet uiwebview*topicview;     nsstring*htmlfile; }  @property (retain) nsstring*htmlfile;  @property (nonatomic) uiwebview*topicview;  @end 

topicdisplayviewcontroller.m

#import "topicdisplayviewcontroller.h" @interface topicdisplayviewcontroller ()  @end  @implementation topicdisplayviewcontroller   @synthesize htmlfile;    - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil { self = [super initwithnibname:nibnameornil bundle:nibbundleornil]; if (self) {     // custom initialization } return self; }  - (void)viewdidload { nsstring *bundle = [[nsbundle mainbundle] bundlepath]; nsstring *webpath = [bundle stringbyappendingpathcomponent:htmlfile]; [topicview loadrequest:[nsurlrequest requestwithurl:                       [nsurl fileurlwithpath:webpath]]];   }   @end