ios - Hit json url link to check any new data after a certain time in objective c -

-

i need hit json url every 1 week check new data.i tried way.

first take lunching time in milisecond , save in plist,

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {  long currenttime = (long)(nstimeinterval)([[nsdate date] timeintervalsince1970]);     nsdictionary * dict =[nsmutabledictionary new];     paths = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);     documentsdirectory = [paths objectatindex:0];     path = [documentsdirectory stringbyappendingpathcomponent:@"time.plist"];     [dict setvalue:[nsnumber numberwithlong:currenttime] forkey:@"count"];     [dict writetofile:path atomically:yes]; }

then check in background .if 7 days gone,i fire timer hit json url. 

- (void)applicationdidenterbackground:(uiapplication *)application { paths = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);     documentsdirectory = [paths objectatindex:0];     path = [documentsdirectory stringbyappendingpathcomponent:@"json.plist"];      nsdictionary *plistdictionary = [nsdictionary dictionarywithcontentsoffile:path];      long plisttime= [[plistdictionary objectforkey:@"count"] longvalue];     timewithsevendays=plisttime+604800;      timer =   [nstimer scheduledtimerwithtimeinterval:timewithsevendays                                                target: self                                              selector: @selector(checkforupdatejson)                                              userinfo: nil                                               repeats: yes];     [timer fire];  }

after firing timer,i update plist data current time. if application in foreground in 7 days, create complexity.

should use background service ? background service decrease battery life. or efficient way add appdelegate works foreground , background.

just check new data in didfinishlaunchingwithoptions.

alternative have push notification server let user know there's new content , download when app becomes active.


Comments

Post a Comment

Popular posts from this blog

javascript - Slick Slider width recalculation -

-
i'm trying add slide in panel on slick container css. carousel works except new width not being calculated when space has been added. recalibrate once advance next slide i'd happen each time panel opened or closed. i've tried adding both margin , padding, neither makes difference. ideas? https://jsfiddle.net/mhigley/dpf7mlpl/ html: <button type="button" id="button"><i class="fa fa-arrow-right"></i></button> <aside> <h2>slide in panel</h2> <ol> <li>list item</li> <li>list item</li> <li>list item</li> <li>list item</li> <li>list item</li> </ol> </aside> <main role="main"> <div class="sections"> <section> <article> <h2>first slide</h2> <p>lorem ipsum d...
Read more

jsf - PrimeFaces Datatable - What is f:facet actually doing? -

-
looking through primefaces code in app noticed following line: <f:facet name="header">#{trainsearch.traincount} trains</f:facet> it looks overriding header, makes sense, can explain me in little more detail? what happening line of code? complete code listed below: <p:datatable id = "results" value = "#{trainsearch.trains}" var = "train" rendered="#{not empty trainsearch.trains}" styleclass = "train-search-table horizontal-border"> <f:facet name="header">#{trainsearch.traincount} trains</f:facet> <p:column headertext = "train id"> <p:panelgrid columns="1" styleclass = "train-id-grid" layout = "grid"> <h:outputtext styleclass = "train-id-label" value="#{train.traini}"/> <h:outputtex...
Read more

angular2 services - Angular 2 RC 4 Http post not firing -

-
i trying fire post request app , it's not working, tried multiple ways. don't see request being fired under network tab in chrome. not sure problem is, appreciated. import { injectable } '@angular/core'; import { http, headers } '@angular/http'; @injectable() export class userservice{ private _url="users"; constructor(private _http: http){ } checkifusernameexists(username){ return this._http.get(this._url+"/"+username) .map(response => response.json()) } createuser(user){ let headers = new headers(); headers.append('content-type', 'application/json') console.log(json.stringify(user)); return this._http.post(this._url, json.stringify(user),{headers: headers}) .map(response => response.json()) } } first need capture error , solve error: this._http.post(this._url, json.stringify(user),{headers: headers}) .subscribe( ...
Read more