Question

在我第一次加载时，一切都很棒。这是我的NSlog

2013-03-07 09:15:57.289 SAMPLE[10566:207] -->Starting viewDidLoad
2013-03-07 09:15:57.775 SAMPLE[10566:207] -->Starting viewDidAppear
2013-03-07 09:15:58.518 SAMPLE[10566:207] all done!
2013-03-07 09:15:58.518 SAMPLE[10566:207] stories array has 4 items
2013-03-07 09:15:58.527 SAMPLE[10566:207] -->Starting CellForRowAtIndex

但是，当我单击导航中的后退按钮并再次单击视图时，它会一直挂起，直到填充单元格。见下面的NSlog

2013-03-07 09:16:06.252 SAMPLE[10566:207] -->Starting viewDidLoad
2013-03-07 09:16:06.309 SAMPLE[10566:207] -->Starting CellForRowAtIndex
2013-03-07 09:16:07.019 SAMPLE[10566:207] -->Starting CellForRowAtIndex
2013-03-07 09:16:07.679 SAMPLE[10566:207] -->Starting CellForRowAtIndex
2013-03-07 09:16:08.198 SAMPLE[10566:207] -->Starting CellForRowAtIndex
2013-03-07 09:16:09.242 SAMPLE[10566:207] -->Starting viewDidAppear

我的viewDidAppear在此有以下内容。

- (void)viewDidAppear:(BOOL)animated {
    NSLog(@"-->Starting viewDidAppear");   

     [super viewDidAppear:animated];

    if ([[xmlParser branch] count] == 0) {
         [self loadDatafromServer];   // Goes and runs my XML Parser and fill the array.

    }
         [self loadBranchs];  // This just loads my annotations for my map
  [self.tableView reloadData];       
}

这里有任何想法。正如我所说，她第一次加载完美，但如果用户回来并进来，它首先填充单元格导致延迟。我希望它打开视图然后填充。指示器将显示它们的载荷。

Answer 1

不要在viewDidAppear中实现该任务，因为此方法在呈现视图之前执行与之关联的其他任务。所以延迟。更好地在viewWillAppear方法中实现它。

 - (void)viewWillAppear:(BOOL)animated {

     [super viewWillDidAppear:animated];

        if ([[xmlParser branch] count] == 0) {
             [self loadDatafromServer];   // Goes and runs my XML Parser and fill the array.

        }
             [self loadBranchs];  // This just loads my annotations for my map
      [self.tableView reloadData];       
    }

希望它可以帮助你：）

第二次尝试时，在CellForRowAtIndex之后加载viewDidAppear

1 个答案: