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POupdate value for a key in dictionary
 

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  1. POupdate value for a key in dictionary
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    <p>I want to update value for key 'distance' in a dictionary which is not Mutable, I have an array consist of dictionaries which is read from json, I need to update all distance values in app, could you please provide me by a sample code that how can I do this?</p> <p>here is where I create this array:</p> <pre><code>NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&amp;response error:&amp;err]; self.seachResult =[NSJSONSerialization JSONObjectWithData:responseData options:nil error:nil]; </code></pre> <p>and here is sample information in it:</p> <pre><code>2013-07-20 00:04:41.753 MyApp[61075:16a03] sorted array of dictionaries: ( { cid = 2; distance = 0; image = "http://images.png"; latitude = "48.245565"; longitude = "16.342333"; manual = ""; movie = "http://jplayer.org/video/m4v/Big_Buck_Bunny_Trailer.m4v"; pcode = 023942435228; pid = 1; pname = "example product"; price = "12.00"; qrcode = ""; rid = 1; rname = "Example Retailer Name"; sale = 0; "sale_percent" = 0; "sale_price" = "0.00"; text = "here is text about sample product number 1...\nasdasdasda\nsdfsdfsd\nSdfsdf }, { cid = 1; distance = 0; image = ""; latitude = ""; longitude = ""; manual = ""; movie = ""; pcode = 1; pid = 3; pname = "test product"; price = "46.00"; qrcode = ""; rid = 2; rname = ""; sale = 0; "sale_percent" = 0; "sale_price" = "35.00"; text = "some text here... }, { cid = 2; distance = 0; image = "httpestImage"; latitude = "48.245565"; longitude = "16.342333"; manual = ""; movie = ""; pcode = 1; pid = 2; pname = "sample product 2"; price = "126.00"; qrcode = ""; rid = 1; rname = "Example Retailer Name"; sale = 1; "sale_percent" = 20; "sale_price" = "99.99"; text = "here is text about sample product number 2...\nblah blah blah\nasdasdasd\nASdasdas\nASdasdasd"; } ) </code></pre> <p>for test I tried this but even I cannot update value for such a simple dictionary:</p> <pre><code>NSMutableDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys: @"value1", @"key1", @"value2", @"key2", nil]; [dict setValue:@"test" forKey:@"key2"]; </code></pre> <p>error:</p> <p>2013-07-20 00:46:08.086 NSdictionaryTest[61130:11303] <strong>* Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[&lt;__NSDictionaryI 0x7556390> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key key2.' *</strong> First throw call stack: (0x1c90012 0x10cde7e 0x1d18fb1 0xb79e41 0xafb5f8 0xafb0e7 0x2200 0xf31c7 0xf3232 0x423d5 0x4276f 0x42905 0x4b917 0xf96c 0x1094b 0x21cb5 0x22beb 0x14698 0x1bebdf9 0x1bebad0 0x1c05bf5 0x1c05962 0x1c36bb6 0x1c35f44 0x1c35e1b 0x1017a 0x11ffc 0x1e5d 0x1d85) libc++abi.dylib: terminate called throwing an exception</p>
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    1. COYou are initializing the NSMutableDictionary *dict with an immutable one. This should work: NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys: @"value1", @"key1", @"value2", @"key2", nil]; [dict setValue:@"test" forKey:@"key2"];
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