ios 如何在iOS中制作水平滚动菜单
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how to make horizontal scrolling menu in iOS
提问by Fahim Parkar
I would like to make a menu which will have horizontal scrolling.
我想做一个水平滚动的菜单。
The menu contains total 16 categories. So I am planning to take 8 on first part and rest 8 on another part.
菜单共包含 16 个类别。所以我打算在第一部分拿 8 分，在另一部分拿 8 分。
Can some-one give me insight of what needs to be done?
有人可以让我了解需要做什么吗？
I believe I need to use below.
我相信我需要在下面使用。
UIScrollView
Add buttons in this scrollview
That's it?
就是这样？
What I want is on first screen 8 buttons where first screen will have two rows with 4 buttons set on each row.
我想要的是第一个屏幕 8 个按钮，其中第一个屏幕将有两行，每行设置 4 个按钮。
Menu sample can be seen at http://www.shoutem.com/
菜单示例可以在http://www.shoutem.com/上看到
回答by Eric
If all you're doing is adding buttons to a horizontal scroll view you would do something like follows...
如果您所做的只是向水平滚动视图添加按钮，您将执行以下操作...
- (void)createScrollMenu
{
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 100)];
int x = 0;
for (int i = 0; i < 8; i++) {
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(x, 0, 100, 100)];
[button setTitle:[NSString stringWithFormat:@"Button %d", i] forState:UIControlStateNormal];
[scrollView addSubview:button];
x += button.frame.size.width;
}
scrollView.contentSize = CGSizeMake(x, scrollView.frame.size.height);
scrollView.backgroundColor = [UIColor redColor];
[self.view addSubview:scrollView];
}
This will create a scrollview with a height of 100, width as big as its parent, and add 8 buttons to it.
这将创建一个高度为 100、宽度与其父级一样大的滚动视图，并为其添加 8 个按钮。
回答by Matt
You can accomplish you're goal using a UIScrollView and your UIButton objects, it would involve setting each button's frame / layout properties depending on what iOS version you're targeting. (As in Eric's answer).
您可以使用 UIScrollView 和您的 UIButton 对象来实现您的目标，这将涉及根据您的目标 iOS 版本设置每个按钮的框架/布局属性。（如埃里克的回答）。
However, if you're targeting iOS 6 and above, using a UICollectionView where your items/cells are the buttons, then you can get the horizontal scrolling "menu bar" for free. There are plenty of SO posts on this, but the main idea is to use a flow layout where the item size has a height such that there will only be one row of items (just make the item height the same as the collection view's height).
但是，如果您的目标是 iOS 6 及更高版本，使用 UICollectionView，其中您的项目/单元格是按钮，那么您可以免费获得水平滚动的“菜单栏”。有很多关于此的 SO 帖子，但主要思想是使用流布局，其中项目大小具有高度，以便只有一行项目（只需使项目高度与集合视图的高度相同） .
EDIT:
编辑：
I should say, this might seem like overkill (and maybe it is), but you will end up with a much more flexible component in case requirements change in the future. It also doesn't result in much extra code and abstracts away tedious layout details.
我应该说，这可能看起来有点矫枉过正（也许确实如此），但是如果将来需求发生变化，您最终会得到一个更加灵活的组件。它也不会产生太多额外的代码并抽象出繁琐的布局细节。
