ios - Wait until method run successfully -

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i make sure [mapview addannotation: annotation1] has been run , call delegates , run rest of code. 

 -(void) addannotations:(double)latit :(double)longit :(nsstring*)value{       annotation *annotation1=[[annotation alloc]init];     annotation1.coordinate = cllocationcoordinate2dmake(latit,longit);     annotation1.title=[nsstring stringwithformat:@"%@", secondidarray];     [mapview addannotation:annotation1];      if([annotationarray count]==0)     {         annotationarray=[[nsmutablearray alloc]initwithobjects:annotation1,nil];         valuearray=[[nsmutablearray alloc]initwithobjects:secondidarray,nil];     }     else{         [annotationarray addobject:annotation1];         [valuearray addobject:secondidarray];      }      for(int i=0;i<[annotationarray count];i++)     {         annotation *a = ((annotation*)[annotationarray objectatindex:i]);          mkannotationview *av1=[mapview viewforannotation:((annotation*)[annotationarray objectatindex:i])];         pincolor=[self colorforacceleration2:[[valuearray objectatindex:i]intvalue]];         a.title=[nsstring stringwithformat:@"particule level:%@",[valuearray objectatindex:i]];         a.color=pincolor;         av1.image=[zspinannotation pinannotationwithcolor:a.color];         av1.annotation=a;     } }  - (void)mapview:(mkmapview *)mapview didaddannotationviews:(nsarray *)views {     //here     [self.mapview selectannotation:[[self.mapview annotations]objectatindex:0] animated:yes]; }


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