设置UIScrollView的内容大小的起点

问题描述

如何设置UIScrollView的起点？我想在UIScrollView左侧添加一个UIImageView，但更改contentSize只会在scrollview右侧添加滚动空间。如何在scrollView的（0,0）点左侧添加ImageView并使其成为scrollview内容大小的一部分？

How do I set the starting point of a UIScrollView? I would like to add a UIImageView left of the UIScrollView but changing the contentSize only adds scrolling room to the right of the scrollview. How do I add an ImageView left of the scrollView's (0,0) point and make it part of the scrollview's content size?

推荐答案

希望我有你想要做的事情。我认为这只需要几轮就可以使用contentOffset来实现。

Hopefully I've got what you're trying to do here. I think this just takes a few turns with the contentOffset to get right.

开始;

• 在第0帧（0,0,320,480）添加scrollView - 它是一个全屏滚动


• 将contentSize设置为（320 * 3,480） - 它现在有一个内容宽度为3'页'


• 将您的imageView作为子视图添加到scrollView at frame（320,0,320,480）


• 将scrollView的contentOffset设置为（320,0） - 这会将scrollView的内容向左移动，在负x方向上移动320


• 现在你的imageView将在屏幕上，但它的宽度都是320px在滚动条内容的左侧和右侧。

• Add the scrollView at frame (0,0,320,480) - its a full screen scroller
• set contentSize to (320*3, 480) - it now has a content with the width of 3 'pages'
• Add your imageView as a subview to the scrollView at frame (320,0,320,480)
• set contentOffset of the scrollView to (320, 0) - this will move the content of the scrollView left, in the negative x direction by 320
• Now your imageView will be on screen, but it will have a 320px width both on the left and right on the scroller content.

（请注意，在下面的代码中，我只是添加了一个UIView而不是一个imageView）

(Note that in the code below, i've simply added a UIView and not an imageView)

UIScrollView *scroller = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
scroller.delegate = self;
scroller.pagingEnabled = YES;
scroller.backgroundColor = [UIColor blueColor];
scroller.contentSize = CGSizeMake(960, 480);

UIView *imgView = [[UIView alloc] initWithFrame:CGRectMake(320, 0, 320, 480)];
[imgView setBackgroundColor:[UIColor redColor]];
[scroller addSubview:imgView];

[scroller setContentOffset:CGPointMake(320, 0)];
[self.view addSubview:scroller];

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