ios - show spinner and remove it in the same block -


in method can take several seconds have:

uiactivityindicatorview *spinner = [[uiactivityindicatorview alloc]initwithframe:cgrectmake(135,140,50,50)]; spinner.color = [uicolor bluecolor]; [spinner startanimating]; [_mapviewcontroller.view addsubview:spinner];  // lots of code  [spinner removefromsuperview];

the spinner doesn't show up. since screen doesn't update @ time. how can around problem?

use gcd:

uiactivityindicatorview *spinner = [[uiactivityindicatorview alloc]initwithframe:cgrectmake(135,140,50,50)]; spinner.color = [uicolor bluecolor]; [spinner startanimating]; [_mapviewcontroller.view addsubview:spinner];  dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{     // lots of code run in background      dispatch_async(dispatch_get_main_queue(), ^{         // stop , remove spinner on main thread when done         [spinner removefromsuperview];     }); });

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