PopOver和UIStoryboardPopoverSegue类奇怪的行为

Question

基于uitableviewcell选择，我执行了一个segue。我已经在下面粘贴了我对segue代码的准备工作。就在它的位置，代码似乎工作正常。但是，当我移动线

currentSelectionPopOver = [(UIStoryboardPopoverSegue *)segue popoverController];

直接在

之后      [destList setDelegate：self]; 语句，我加载视图时似乎没有设置我的destList属性的if语句。思考？只是对这种行为感到好奇。

   - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {



    if([segue.identifier isEqualToString:@"showSelectionList"]) {

        //the destination view controller displays the data
        SelectionListController *destList = segue.destinationViewController;
        [destList setDelegate:self];


        //Set the type of selection list to show.
        if(tagThatRequestedSelectionList == TAG_OFFSET + STATE) {
            DLog()
            [destList setRequestType:STATES_LIST];
        }//end if.

        if(tagThatRequestedSelectionList == TAG_OFFSET + CITY) {
            DLog();
            [destList setRequestType:CITY_LIST];
        }//end if.

        //Setup a pointer to the popover controller so it can be dismissed.
        currentSelectionPopOver = [(UIStoryboardPopoverSegue *)segue popoverController];    
     }
     }//end prepare.