UIScrollView中的UIView没有出现

Question

我正在尝试创建一个类似于this video中的水平滚动菜单。

由于某些原因，在向UIView添加一堆UIButtons并将其添加到UIScrollView后，-viewDidLoad不会显示。这是我的代码（它在UIViewController的子类的//set up scrollview UIScrollView *designPicker = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 431, 320, 49)]; //set up a view to drop into the scroll view UIView * buttonsView = [[UIView alloc] initWithFrame:CGRectMake(0, 431, 640, 49)]; //add buttons to scrollview // load all the images from our bundle and add them to the scroll view NSUInteger i; float runningX = designPicker.frame.origin.x; for (i = 1; i <= 10; i++) { UIButton *tempBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [tempBtn setBackgroundImage:[UIImage imageNamed:@"button.png"] forState:UIControlStateNormal]; CGRect rect = CGRectMake(runningX, designPicker.frame.origin.y, 30.0, 30.0); tempBtn.frame = rect; [buttonsView addSubview:tempBtn]; runningX = runningX + 35; [tempBtn release]; } [designPicker setContentSize:buttonsView.frame.size]; [designPicker addSubview:buttonsView]; [self.view addSubview:designPicker]; 中调用）：

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Answer 1

您不应使用UIScrollView的框架添加按钮。框架的原点位于superview的（UIScrollView）坐标的超视图中。您应该使按钮的框架相对于UIView。因此，如果您希望按钮显示在视图的顶部，您应该从（0,0）开始。

Answer 2

不是将scrollview作为子视图添加到视图中，而是将视图添加为scrollview的子视图。正如 -

[self.scrollView addSubview:self.view];
// release scrollView as self.view retains it
self.view=self.scrollView;
[self.scrollView release];

并确保您的视图的内容大小应该大于滚动视图的内容大小。它对我有用。