ios - Error SIGABRT while trying to delete multiple selected cells in UICollectionView: -

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i trying delete series of selected images in uicollectionview on clicking delete button. here delete button action:

- (ibaction)deletevideos:(id)sender {     if(deleteenabled){         if([selectedvideos count]>0){             for(nsarray *indexpath in self.memorymirrorsessioncollectionview.indexpathsforselecteditems) {                 [videoimagesarray removeobjectatindex:indexpath];                 [image_array removeobjectatindex: indexpath];                 nslog(@"%@", indexpath);                 [self.memorymirrorsessioncollectionview deleteitemsatindexpaths:indexpath];             }         }     } }

and these declarations , definitions:

@interface xvzuicollectioncontroller(){     nsmutablearray *videoimagesarray;     bool selectenabled;     nsmutablearray *selectedvideos;     bool deleteenabled;     bool shareenabled;     nsinteger *indexstack; }  - (void)viewdidload {     image_array = [nsmutablearray arraywithobjects:     @"testimage1.jpg", @"testimage2.png", @"testimage3.jpg", @"testimage4.png",@"testimage5.jpg", @"testimage2.png",@"testimage1.jpg", @"testimage5.jpg", nil ];     videoimagesarray = [nsmutablearray arraywithobjects: image_array, nil];    }

when click on delete button, signal abort exception on highlighted line below. suggestions? 

int main(int argc, char *argv[]) {     @autoreleasepool {         **return uiapplicationmain(argc, argv, nil, nsstringfromclass([nmappdelegate class]));** //sigabrt     } }

your for loop structured incorrectly.

you repeatedly retrieving nsarray reference using integer in delete calls.

you should retrieve selected index paths once , iterate on selected paths -

- (ibaction)deletevideos:(id)sender {     if(deleteenabled){         if([selectedvideos count]>0){             nsarray *selectedindexpaths=self.memorymirrorsessioncollectionview.indexpathsforselecteditems;             for(nsindexpath *indexpath in selectedindexpaths) {                 [videoimagesarray removeobjectatindex:indexpath.item];                 [image_array removeobjectatindex: indexpath,item];                 nslog(@"%d", indexpath.item);                 [self.memorymirrorsessioncollectionview deleteitemsatindexpaths:indexpath];             }         }     } }

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