如何让TextView能够水平滚动 [英] How to let TextView be able to scroll horizontally

问题描述

我知道TextView嵌入在ScrollView中.如果String (其中不包含"\n")

I know the TextView is embedded in a ScrollView. And if there is a fairly long String(Which contains no "\n")

TextView将根据TextView的宽度自动进行换行.

The TextView will automatically do the line-wrap, according to the width of the TextView.

如果TextView的高度很短，那么我们可以垂直滚动它. 如何禁用自动换行?这样，如果没有遇到"\ n"，则不会换行.而是让用户水平滚动以查看文本.

If TextView's height is short, then we are able to scroll it vertically. How do you disable the auto line-wrap? Such that, if there are no "\n" encounters, it does not line wrap. Rather, it lets the user scroll horizontally to view the text.

我该如何实现?

推荐答案

我想出了如何在许多人的帮助下做到这一点:D，谢谢，我们开始了！

I figure out how to do this with many helps of you guys :D, thanks, and here we go!

1..因此，首先，我们需要一个longlonglong字符串，对吗?

1. So, firstly, We need a longlonglong String, right?

let displayStr = "1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20\n1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 "

2.假设我们有一个UIScrollView，它通过@IBOutlet链接或通过调用.viewWithTag(xxx)获得，我们将其命名为scroll:

2. Assume we have a UIScrollView which is linked by @IBOutlet or got by calling the .viewWithTag(xxx) .We will let it be named as scroll :

3..现在该获取字符串的 size 了，这是我们将使用的关键功能:

3. It's time to get the size of our string, here is a key function we'll use it:

哦！我几乎忘了定义我们将使用哪种 Font (这是一个至关重要的参数)，以及字符串大小的 max-size 是什么

Oh! I almost forget to define what kind of Font( this's a crucial parameter ) we will use, and What is the max-size of our string's size

let maxSize = CGSizeMake(9999, 9999)
let font = UIFont(name: "Menlo", size: 16)!
//key function is coming!!!
let strSize = (displayStr as NSString).boundingRectWithSize(maxSize, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName : font], context: nil)

4.好，现在我们可以将字符串放入textView中，您需要以编程方式创建一个新的UITextView，以便我们可以定义与字符串大小相同的框架(哦，也许更大一些:D):

4. OK, now we can put the string into a textView, you need to programmatically create a new UITextView, so that we can define the frame which is identical to the string's size(Oh, maybe a little bigger :D) :

let frame = CGRectMake(0, 0, size.width+50, size.height+10)
let textView = UITextView(frame: frame)
textView.editable = false
textView.scrollEnabled = false//let textView becomes unScrollable
textView.font = font
textView.text = displayStr

5..回到我们的scroll，我们将其设置为contentSize:

5. Back to our scroll, we will set its contentSize:

scroll.contentSize = CGSizeMake(size.width, size.height)

6..最后，添加Subview: scroll.addSubview(textView)

6. Finally, addSubview: scroll.addSubview(textView)

您可以看到，textView嵌入在scrollView中，这使它可以 用2个方向滚动.

You can see, textView is embed in a scrollView, which allow it to scroll with 2 directions.

B.T.W.我的工具只是一个演示 静态字符串.如果您希望用户使用不会行的textView 如果他不输入任何"\ n"，则换行，您可能需要动态计算 字符串大小. :D

B.T.W. My implement is just a demo for static String. if you want user to use a textView which will not line wrap if he doesn't input any "\n", you may need dynamically calculate the string size. :D

[我希望这会有所帮助]

[I hope this will help]

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