UIScrollView无法正确还原 [英] UIScrollView does not restore properly

问题描述

我有一个Scrollview，它的属性在viewDidAppear中设置. 现在，当我第一次进入Scrollview时，没有任何问题.但是我有分配给UINavigationController的按钮.因此，当我按其中一个UINavigationController打开时，当我关闭导航控制器时，ScrollView无法正确还原.它基本上将屏幕的中心与先前按下的按钮位置对齐.因此，如果我尝试向上滚动，则不会.

I have a Scrollview, it's properties are set in viewDidAppear. Now when I get to the Scrollview first time there isn't any problem. However I have buttons that are assigned to UINavigationController. So when I press into one of them UINavigationController opens up, when I close the navigation controller, ScrollView does not restore properly. It basically aligns the centre of the screen as previously pressed button location. So if I try to scroll up it does not.

我尝试在viewDidAppear中使用它:

I have tried using this in my viewDidAppear:

scrollView.center = CGPointMake(scrollView.contentOffset.x, scrollView.contentOffset.y); 

哪个工作不太好.我该如何解决?我正在使用iOS6.1

Which did not quite work. How can I solve this? I am using iOS6.1

推荐答案

实际上，我在这里找到了答案:

Actually I found the answer here:

UIScrollview自动布局问题

我使用的确切代码是:

- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    //save the current offset
    previousPoint = scrollView.contentOffset;
    //set current view to the beginning point
    self.scrollView.contentOffset = CGPointZero;
}

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    //retrieve the previous offset
    self.scrollView.contentOffset = previousPoint;
}

previousPoint只是在实现中声明的CGPoint变量.

previousPoint is nothing but a CGPoint variable declared on the implementation.

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