无法在iOS7上使用scrollsToTop [英] Can't get scrollsToTop working on iOS7

问题描述

我的目标是在我的最新应用中使用iOS7，点击状态栏似乎无法将tableView或collectionView滚动到顶部。

I'm targeting iOS7 in my latest app, and tapping on the status bar doesn't seem to scroll a tableView or collectionView to the top.

我'设置 self.tableView.scrollsToTop = true 但仍然没有任何反应。

I've set self.tableView.scrollsToTop = true and still nothing happens.

我知道Apple显着改变了状态栏在iOS7中，但这些更改是否会破坏 scrollsToTop 功能？

I know Apple significantly changed the status bar in iOS7, but did those changes break the scrollsToTop functionality?

更新

为了回应其中一个答案中的评论，我测试了以确保我的集合视图确实是屏幕上唯一的scrollView，它是：

In response to a comment in one of the answers, I tested to ensure that my collection view was indeed the only scrollView on the screen, and it was:

(lldb) po [self.view recursiveDescription]
<UIView: 0x1092ddf0; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x109357e0>>
   | <UICollectionView: 0x11351800; frame = (0 0; 320 568); clipsToBounds = YES; opaque = NO; autoresize = W+H; gestureRecognizers = <NSArray: 0x10966080>; layer = <CALayer: 0x109623a0>; contentOffset: {0, -64}> collection view layout: <UICollectionViewFlowLayout: 0x10940a70>
   |    | <UIImageView: 0x10965fa0; frame = (0 564.5; 320 3.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x10965ee0>> - (null)
   |    | <UIImageView: 0x10948f60; frame = (316.5 561; 3.5 7); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x10966030>> - (null)

更新＃2

不确定是否重要，但我使用的是标准的iOS7 NavigationController，其中navigationBar是透明的，并且当我们在下面滚动时将模糊应用到我的集合/ tableViews。

Not sure if it matters, but I'm using a standard iOS7 NavigationController where the navigationBar is transparent and applies a blur to my collection/tableViews as they scroll underneath.

更新＃3

想出来。结果我做了在屏幕上有多个scrollView。我的应用程序在应用程序的主要部分下面有一个左抽屉菜单，该菜单有一个tableView用于选项。我只需设置 self.menuTable.scrollsToTop = false ，一切都在应用程序的其余部分按预期工作。没有必要实现scrollView Delegate方法或任何东西。

Figured it out. Turns out I did have more than one scrollView on the screen. My app has a left drawer menu underneath the main part of the app, and that menu has a tableView for the options. I simply set self.menuTable.scrollsToTop = false and everything worked as expected throughout the rest of the app. Didn't have to implement the scrollView Delegate methods or anything.

推荐答案

你有多个滚动视图/表视图/屏幕上的集合视图？如果是这样，只有其中一个可以 scrollsToTop 设置为 YES ，否则iOS7不会将其中任何一个滚动到顶部。

Do you have more than one scroll view/table view/collection view on screen? If so, only one of them can have scrollsToTop set to YES, otherwise iOS7 will not scroll any of them to the top.

您还可以实现UIScrollViewDelegate方法 scrollViewShouldScrollToTop： 如果传入滚动视图则返回YES等于你要滚动到顶部的那个：

You can also implement the UIScrollViewDelegate method scrollViewShouldScrollToTop: and return YES if the passed in scroll view is equal to the one that you want to scroll to the top:

- (BOOL) scrollViewShouldScrollToTop:(UIScrollView*) scrollView {
    if (scrollView == self.myTableView) {
        return YES;
    } else {
        return NO;
    }
}

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