iOS7 UIWebView Memory leak

Question

We have an comprehensive iOS app with Hybrid mode - a UIWebView hold the major part of the web application in JS. It works fine on iOS6, but recently we found serious out of mem

Answer 1

Both the UIWebView and the native safari browser with iOS7 seems to have a problem in memory management when handling json object. If you have a dictionary with a deep nested structure, and you happen to have one of the key to be a numeric string, and it is less than 99999, you might have received memory warnings frequently.

something like,

 {"**98304**":
     {"key":
         {"2ndLevelKey":
             {
                "address":"10928 Homestead rd","city":"Cupertino","Zip":95014
             }
         }
     }
 }

The work around is simple, try to replace the key "98304" something like "ID98304". Hope you have tackled the problem already. :)

Answer 2

I don't have enough reputation to upvote or comment. So I think an "answer" is the only way that I can contribute.

I agree with Ming Zhu's contribution. I found that if you have 5 digit keys (9999 < key <= 99999) the memory usage on iOS 7 explodes.

Below is the example code that I came to when trying to reproduce what was crashing my app.

tempobj = {};

for(var i=1; i<2000; i++){
    var temp = {};
    tempobj[i] = temp;
    temp[98304] = "hello world";
}

I did also submit a bug to apple before finding this stackoverflow, but looks like that is a good thing anyways.