tableview 使用中防止数组越界

在写项目的时候，调用下面的方法时

- (void)fetchOwnedStockSocketData
{
    [self.ownedStockDataArray enumerateObjectsUsingBlock:^(DNUserOptionalListModel * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
   [self.secket dn_establishConnectionWithParams:obj.prod_code subscribeType:DNSocketMsgSendSubscribeTypeSubscribe successOnMainThread:^(NSDictionary * _Nullable data) {
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection:0];
                DNUserOptionalListModel *userOptionalEntity = self.ownedStockDataArray[indexPath.row];
                if ([userOptionalEntity.last_px floatValue] != [data[@"last_px"] floatValue]) {
                    userOptionalEntity.last_px = data[@"last_px”];
                    userOptionalEntity.px_change_rate = data[@"px_change_rate”];
                    DLog(@"prod_code=====%@",data[@"prod_code”]);
                    if ([obj.prod_code isEqualToString:data[@"prod_code"]] && self.searchController.active == NO) {
                        [self.ownedStocktableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
                    }
                }
        }];
    }];
}

崩溃日志如下： 111.png

。

其实这是数组越界造成的：解决方案如下

- (void)fetchOwnedStockSocketData
{
    [self.ownedStockDataArray enumerateObjectsUsingBlock:^(DNUserOptionalListModel * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        
        [self.secket dn_establishConnectionWithParams:obj.prod_code subscribeType:DNSocketMsgSendSubscribeTypeSubscribe successOnMainThread:^(NSDictionary * _Nullable data) {
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection:0];
            if (indexPath.row <= self.ownedStockDataArray.count-1) {
                DNUserOptionalListModel *userOptionalEntity = self.ownedStockDataArray[indexPath.row];
                if ([userOptionalEntity.last_px floatValue] != [data[@"last_px"] floatValue]) {
                    userOptionalEntity.last_px = data[@"last_px"];
                    userOptionalEntity.px_change_rate = data[@"px_change_rate"];
                    DLog(@"prod_code=====%@",data[@"prod_code"]);
                    if ([obj.prod_code isEqualToString:data[@"prod_code"]] && self.searchController.active == NO) {
                        [self.ownedStocktableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
                    }
                }
            }
        }];
    }];
}

增加了防止数组越界的判断，这句代码

if (indexPath.row < self.ownedStockDataArray.count) {
}