ios - NSURL download file, indicators shows too late -

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hi got following code , want show activityindicator while downloading. indicator shows when download has finished?

_fandownloadindicator.hidden = no; nslog(@"batzn"); nsstring *documentpath = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes)objectatindex:0]; nsstring *file = [documentpath stringbyappendingpathcomponent:@"fan_new.mp3"]; bool fileexists = [[nsfilemanager defaultmanager]fileexistsatpath:file];  if(fileexists == no) {      nsurl *downurl = [nsurl urlwithstring:url];     nsdata *data = [nsdata datawithcontentsofurl:downurl];     if ([data writetofile:file atomically:yes]) {         nslog(@"downloaded fan");

issue

you doing download task on main thread, , wait until thread ends before show loading view.

solution

you need start downloading task on background thread using dispatch_async. check out code below

_fandownloadindicator.hidden = no; nslog(@"batzn"); nsstring *documentpath = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes)objectatindex:0]; nsstring *file = [documentpath stringbyappendingpathcomponent:@"fan_new.mp3"]; bool fileexists = [[nsfilemanager defaultmanager]fileexistsatpath:file];  if(fileexists == no) {  //show loading view here  dispatch_async(dispatch_get_global_queue( dispatch_queue_priority_high, 0), ^{              //do downloading here on background thread             nsurl *downurl = [nsurl urlwithstring:url];             nsdata *data = [nsdata datawithcontentsofurl:downurl];             dispatch_async(dispatch_get_main_queue(), ^{                 if ([data writetofile:file atomically:yes]) {                     //hide loading view                     nslog(@"downloaded fan");                 }                });         }); }

also i'll provide suggestion loading view mbprogresshud. here can it

//show loading form here [mbprogresshud showhudaddedto:self.view animated:yes]; dispatch_async(dispatch_get_global_queue( dispatch_queue_priority_low, 0), ^{     // something...     dispatch_async(dispatch_get_main_queue(), ^{         [mbprogresshud hidehudforview:self.view animated:yes];     }); });

update

if dealing downloading images, should recommend library:

sdwebimage

it offers third party show activity indicator.


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