如何以编程方式创建 UIScrollView?

问题描述

好的，这里的关键是我根本没有使用 IB，因为我正在使用的视图是通过编程方式创建的.UIView 覆盖了屏幕的下半部分，上面有一堆按钮.但是，我想在 UIView 中添加更多按钮，而不使其变得更大.为此，我想在视图中创建一个 UIScrollView，这将允许我在屏幕外添加更多按钮，以便用户可以滚动到它们.我认为这就是它的工作原理.

Alright, so the key here is I'm not using IB at all, because the View I'm working with is created programmatically. The UIView covers the lower half the screen, and has a bunch of buttons on it. However, I want to add more buttons to the UIView, without making it any larger. To do so, I want to make a UIScrollView inside the view, which will allow me to add more buttons off screen so the user can scroll to them. I think that's how it works.

self.manaView = [[[UIView alloc] initWithFrame:frame] autorelease];
self.manaView.backgroundColor = [UIColor purpleColor];

UIScrollView *scroll = [UIScrollView alloc];
scroll.contentSize = CGSizeMake(320, 400);
scroll.showsHorizontalScrollIndicator = YES;
[self.manaView addSubview:scroll];

代码的第一部分启动了我的 UIView，效果很好，但我不知道如何以编程方式制作 UIScrollView 并将其添加到视图中，然后向其中添加按钮.

The first part of the code iniates my UIView, which works great, but I can't figure out how to make the UIScrollView programmatically and add it to the view, and then add the buttons to it.

UIButton *ret2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
ret2.tag = 102;
ret2.frame = CGRectMake(255, 5, 60, 50);
[ret2 setTitle:@"Return" forState:UIControlStateNormal];
[ret2 addTarget:self action:@selector(flipAction:) forControlEvents:UIControlEventTouchUpInside];
[scroll addSubview:ret2];

当我这样做时，按钮从我的屏幕上消失了.那么我该如何正确地做到这一点呢?感谢您的帮助！

When I did that, the button simply disappeared off my screen. So How do I do this correctly? Thank you for your help!

推荐答案

代替:

UIScrollView *scroll = [UIScrollView alloc];

执行此操作(将框架设置为您希望滚动视图的大小):

do this (setting the frame to however big you want the scroll view to be):

UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:...];

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