如何设置我的iOS故事板像Instagram流一样反弹？ [英] How to set up my iOS storyboard to bounce like Instagram Stream?

问题描述

我正在构建一个包含社交内容流的应用程序，并且我正试图了解Instagram在应用程序中的流程。所以基本上是一个顶部标题，滚动屏幕，但在内容和内容之间反弹。我可以让顶部标题滚动离开屏幕，我可以让视图不反弹，但我想使用Pull来刷新，最后会在faux导航栏上方 UIView 。我知道一个普通的Navbar会产生这个但是这个滚动的是一个不同的故事。

I am building an app with a stream of social content and am trying to get the behavior of how instagram does it's stream in app. So basically a top header that scrolls off the screen but bounces between that and the content. I can make the top header scroll off the screen and I can make the view not bounce but I want to use Pull to refresh and that ends up going above the "faux" nav bar UIView. I know that a normal Navbar will produce this but this one that scrolls off is a different story.

目前我有一个 UITableview 在 UITableViewCell 之上有一个 UIView ，一切都很好，除了反弹发生在<$ c $之上C>的UIView 。我想我需要在 UITableView 之上获得 UIView 但是在UITableViewController中，故事板不允许我放置 UITiew 上方的 UIView 。

Currently I have a UITableview that has a UIView above the UITableViewCell and everything works great except the bounce happens above the UIView. I figure I need to get the UIView above the UITableView however in the UITableViewController the storyboard won't allow me to place the UIView above the UITableView.

任何想法???

谢谢

推荐答案

好吧，我终于把这一切都搞定了，所以我想我会为每个人发布答案。

Well I finally got this all to work so I thought I would post the Answer for everyone.

基本上我设定了一个标准导航栏然后在 scrollViewDidScroll 我得到滚动的偏移量并根据它改变帧。这似乎工作得很好，请参阅下面的scrollViewDidScroll方法。

Basically I set a standard Navigation bar and then on scrollViewDidScroll I get the offset of the scrolling and change the frame based on that. This seems to work perfectly, see below for my scrollViewDidScroll method.

- (void)scrollViewDidScroll:(UIScrollView *)sender {

    //Initializing the views and the new frame sizes.
    UINavigationBar *navbar = self.navigationController.navigationBar;
    UIView *tableView = self.view;

    CGRect navBarFrame = self.navigationController.navigationBar.frame;
    CGRect tableFrame = self.view.frame;

    //changing the origin.y based on the current scroll view.
    //Adding +20 for the Status Bar since the offset is tied into that.
    navBarFrame.origin.y = MIN(0, (sender.contentOffset.y * -1)) +20;
    navbar.frame = navBarFrame;

    tableFrame.origin.y = MIN(0,MAX(-44,(sender.contentOffset.y * -1)));
    tableView.frame = tableFrame;

}

此外，您还需要让TableView 44px更高来补偿滚动否则你的框架将不够大。我刚刚在viewWillAppear中做了这个并使框架更大。

Also you will want to make your TableView 44px taller to compensate for the scrolling otherwise your frame will not be big enough. I just did this in viewWillAppear and made the frame bigger.

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