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我使用UIViewController来自 XIB 的几个子视图（ViewController 的视图），它们是在使用UISegmentedControl. 其中一个视图包含一个UIScrollView. 问题是第一次添加此子视图时UIScrollView不可滚动。如果我选择另一个片段/视图，然后选择另一个片段/视图，那么它现在是可滚动的。UIScrollView

UIScrollView仅在 IB 中添加。这是 MainViewController.m 中视图和 UISegmentedControl 的一些代码

- (void)viewDidLoad
{
[super viewDidLoad];

nameSubViewController = [[NameSubViewController alloc] initWithNibName:@"NameSubViewController" bundle:nil];
nameSubView = (NameSubView *)[nameSubViewController view];

priceSubViewController = [[PriceSubViewController alloc] initWithNibName:@"PriceSubViewController" bundle:nil];
priceSubView = (PriceSubView *)[priceSubViewController view];

[self.view addSubview:nameSubView];
currentView = nameSubView;
}

- (void) segmentAction:(id)sender
{
segmentedControl = sender;
if([segmentedControl selectedSegmentIndex] == 0) {
    [currentView removeFromSuperview];
    [self.view addSubview:nameSubView];
    currentView = nil;
    currentView = nameSubView;
}
if([segmentedControl selectedSegmentIndex] == 1) {
[currentView removeFromSuperview];
[self.view addSubview:priceSubView];
    currentView = nil;
    currentView = priceSubView;
}

在这段代码中，假设段 1 ( priceSubView) 包含 UIScrollView。如果我选择此段，除非我再次选择段 0 ( ) 并重新选择段 1，UIScrollView否则不会对滚动做出反应。nameSubView

是什么导致了这种情况以及如何解决？

4

1 回答 1

0

如果您需要在第一次加载时滚动。您需要在 firstLoad 时添加滚动视图。您在更改段控件后添加滚动视图，这就是它不滚动的原因。一探究竟。

更改viewDidLoad如下：

- (void)viewDidLoad
{
  [super viewDidLoad];

  nameSubViewController = [[NameSubViewController alloc] initWithNibName:@"NameSubViewController" bundle:nil];
  nameSubView = (NameSubView *)[nameSubViewController view];

  priceSubViewController = [[PriceSubViewController alloc] initWithNibName:@"PriceSubViewController" bundle:nil];
  priceSubView = (PriceSubView *)[priceSubViewController view];

  [self.view addSubview:priceSubView];
  currentView = priceSubView;
}
于 2012-10-31T13:16:47.140 回答