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Code:

-(void) viewdidload {[Super viewdidload];            Additional setup after loading the view, typically from a nib.    Uiimageview *imageview=[[uiimageview Alloc]initwithframe:cgrectmake (50, 100, 200, 200)];    Imageview.backgroundcolor=[uicolor Redcolor];                                    [Self.view Addsubview:imageview];   [Self setimageurlwithactivityindicator:@ "I love you!": ImageView]; }//the network requests a picture, add the loading control-(void) Setimageurlwithactivityindicator: (nsstring*) urlstring:(Uiimageview *) image{if (![        URLString isequaltostring:@ ""]) {//__block uiactivityindicatorview *activityindicator = nil;        Uiactivityindicatorview *activityindicator = nil; Activityindicator = [Uiactivityindicatorview.alloc initwithactivityindicatorstyle:        Uiactivityindicatorviewstylegray];        [Image Addsubview:activityindicator];        Cgpoint point = Cgpointmake (IMAGE.FRAME.SIZE.WIDTH/2, IMAGE.FRAME.SIZE.HEIGHT/2);        Activityindicator.center = point; [ActivityindIcator startanimating]; [Image Setimagewithurl:[nsurl Urlwithstring:[image_url stringbyappendingformat:@ "%@", URLString]] PlaceholderI             Mage:nil success:^ (UIImage *image) {NSLog (@ "... success code here ...");             [Activityindicator stopanimating];         [Activityindicator Removefromsuperview];             } failure:^ (Nserror *error) {NSLog (@ "... failure code here ...");             [Activityindicator stopanimating];         [Activityindicator Removefromsuperview];    }]; }}

Web request picture