xcode scrollViewDidScroll 委托正在自动调用
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scrollViewDidScroll delegate is invoking automatically
提问by Bharath
I am using scrollViewDidScroll delegate in my application.
我在我的应用程序中使用 scrollViewDidScroll 委托。
But, many times, even though I dint start scrolling, this delegate is getting invoked which is creating a lot of problem. I heard that even when contentSize for a particular scroll view is set then at that time also this delegate i.e., scrollViewDidScrollwill invoke.
但是，很多时候，即使我没有开始滚动，这个委托也会被调用，这造成了很多问题。我听说即使设置了特定滚动视图的 contentSize ，那时scrollViewDidScroll也会调用这个委托。
What are the different scenarios in which this delegate gets invoked. What are the steps to control this?
调用此委托的不同场景有哪些。控制这种情况的步骤是什么？
Can I set any parameter to handle this?
我可以设置任何参数来处理这个问题吗？
采纳答案by Bharath
回答by Sev
To prevent scrollDidScroll:from firing automatically when the view is loaded and adjusted, I waited to add my UIScrollViewdelegateuntil after all the views load using viewDidLayoutSubviews. It is working well for me.
为了防止scrollDidScroll:在加载和调整视图时自动触发，我等待添加我的，UIScrollViewdelegate直到使用viewDidLayoutSubviews. 它对我来说效果很好。
- (void)viewDidLayoutSubviews {
// add table view delegate after the views have been laid out to prevent scrollViewDidScroll
// from firing automaticly when the view is adjusted on load, which makes the tab bar disappear
self.tableView.delegate = self;
}
回答by Dima
scrollViewDidScroll: gets called every time the scroll bounds change. This means it gets called during the scroll, as well as when it starts. You may want to try scrollViewWillBeginDragging: instead.
scrollViewDidScroll：每次滚动边界改变时都会被调用。这意味着它会在滚动期间以及开始时被调用。您可能想尝试使用 scrollViewWillBeginDragging: 代替。
回答by user1968991
Hi Guys its very old question, however, if you wanna know if the scrollDidScrollwas triggered manually(through finger) or its due to other event like didSelector setContentOffset, use the UIScrollView.isTrackingproperty.
嗨，伙计们，这是一个非常古老的问题，但是，如果您想知道scrollDidScroll是手动触发（通过手指）还是由于其他事件（如didSelector ）setContentOffset，请使用该UIScrollView.isTracking属性。
回答by Karthik damodara
Set UICollectionView, UITableView delegate here in this method
在此方法中设置 UICollectionView、UITableView 委托
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
// This method is called only after all subviews are laid
}
