ios - UIScrollview 第二次没有正确显示

Question

我有一个 UIScrollview，它加载良好，显示良好，一切都很好。然后我推送另一个 View Controller ，称之为 VC2，它也工作正常。从 VC2 我弹出回到 UIScrollview，这是奇怪的行为......当 UIScrollview 回来时，第一个(我猜)从顶部开始的 300 像素被切断。如果我将页面下拉，我仍然可以看到内容，但显然这对我不起作用。有人有什么想法吗？

代码如下:

这是创建 ScrollView :

-(IBAction)startNewSearch:(id)sender
{
NewSearch *VCscrollView = [[NewSearch alloc] init];
[[self navigationController] pushViewController:VCscrollView animated:YES];
}

ScrollView

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];
scrollView.contentSize = CGSizeMake(320, 890);
[scrollView setContentOffset:CGPointMake(0, 0) animated:NO];
[scrollView flashScrollIndicators];
}

-(void)viewWillAppear:(BOOL)animated
{
scrollView.frame = CGRectMake(0, 0, 320, 890);
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

从 ScrollView 中调用 VC2 的 IBAction:

-(IBAction)previewSearch:(id)sender
{   
VCcontactServer *VC2 = [[VCcontactServer alloc] init];
[[self navigationController] pushViewController:VC2 animated:YES];
}

Answer 1

正确答案归功于 Andrey Soloviev，但不幸的是他没有发帖让我给予他荣誉。添加代码:

-(void)viewWillAppear:(BOOL)animated
{
scrollView.frame = CGRectMake(0, 0, 320, 890);
}

按照描述解决了问题。问题的根源最终有点复杂，超出了我的问题范围。