为什么我的scrollView不以我的坐标开始？

问题描述

| 我需要在我的iPad App中放置一个scrollView（内部带有文本滚动）。 我使用以下代码：

- (void)showRootPopoverButtonItem:(UIBarButtonItem*)barButtonItem 
{
    movie_scroll.frame = CGRectMake(50,430,700,600);
    movie_scroll.directionalLockEnabled = YES;
    movie_detail.frame = CGRectMake(0,600,400);

    NSLog(@\"You are in portrait from showRootPopoverButtonItem\"); 
}

- (void)invalidateRootPopoverButtonItem:(UIBarButtonItem*)barButtonItem 
{
    movie_scroll.frame = CGRectMake(50,540,400);
    movie_scroll.directionalLockEnabled = YES;
    movie_detail.frame = CGRectMake(0,300);

    NSLog(@\"You are in landscape from invalidateRootPopoverButtonItem\"); 
}

- (void)viewDidLoad

//change position for scrollView
if (UIDeviceOrientationIsLandscape(self.interfaceOrientation))
{
    movie_scroll.frame = CGRectMake(50,300);

    NSLog(@\"You are in  landscape from viewDidLoad\");   
}
else 
{
    movie_scroll.frame = CGRectMake(50,400);

    NSLog(@\"You are in portrait da viewDidLoad\");   
}

好吧，当我第一次以纵向运行该应用程序时，我的位置没有scrollView。如果我尝试旋转设备，则scrollView的起始位置... 为什么？     

解决方法

您可能应该将viewDidLoad代码放入viewWillAppear：中，因为可能未在viewWidAppear：之前在viewDidLoad中设置所有内容的界限。我不明白您的最后一个问题：\“如果我尝试旋转设备，则scrollView的起始位置... \”