iphone - how to avoid overwrite file -

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i using nsurlconnection download file server , storing locally follows 

-(void) connection:(nsurlconnection *)connection      didreceivedata:(nsdata *)data   {      [webdata appenddata:data];      paths = nssearchpathfordirectoriesindomains(nsdocumentdirectory , nsuserdomainmask, yes);       self.documentsdir = [[paths objectatindex:0]stringbyappendingpathcomponent:@"newresult.zip" ];       [[nsfilemanager defaultmanager] createfileatpath:documentsdir contents:nil attributes:nil];      nsfilehandle *file1 = [nsfilehandle filehandleforupdatingatpath: documentsdir];      [file1 writedata: webdata];       [file1 closefile];   }

this working overwrite old file every time how avoid on writing know possible nsurldownload here not using nsurldownload.

if (![filemanager fileexistsatpath: path]){     nslog(@"file not exists @ path %@", path);     }else{     nslog(@"file exists @ path:%@", path); }

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