iOS - 如何预定义 TextView 行高 [英] iOS - How to predefine TextView line height

问题描述

我有一些 UITextView 声明如下

lazy var inputTextView: UITextView = {
    let tv = UITextView()
    tv.tintColor = UIColor.darkGray
    tv.font = UIFont.systemFont(ofSize: 17)
    tv.backgroundColor = UIColor.white
    return tv
}()

我一直在搜索如何为这个 UITextView 预定义行高，所以每当我写一个长文本时，当它到达行尾时到下一行，间距将大于默认值.

I've been searching how can I predefine the line height for this UITextView so whenever I write a long text, when it reaches the end of the line and goes to the following line, the spacing would be bigger than the default.

我尝试在 UITextView 声明中使用以下内容:

I've tried using the following inside the UITextView declaration:

let style = NSMutableParagraphStyle()
style.lineSpacing = 40
let attributes = [NSParagraphStyleAttributeName : style]
tv.attributedText = NSAttributedString(string: "", attributes:attributes)

会变成:

lazy var inputTextView: UITextView = {
    let tv = UITextView()
    tv.tintColor = UIColor.darkGray
    tv.font = UIFont.systemFont(ofSize: 17)
    tv.backgroundColor = UIColor.white
    let style = NSMutableParagraphStyle()
    style.lineSpacing = 40
    let attributes = [NSParagraphStyleAttributeName : style]
    tv.attributedText = NSAttributedString(string: "", attributes:attributes)
    return tv
}()

它仅在我在 attributedText 属性中预先插入一些文本时才有效，但由于文本一开始是空的，因此不会使用这些属性，而是将其设置为默认值.

It only works if I pre-insert some text in the attributedText property but since the text is empty in the beginning it will not use those properties and it will be set as default.

当我在 UITextView 中书写时，如何增加默认行高并保持它?

How can I increase the default line height and keep it whenever I'm writing in the UITextView?

谢谢;)

推荐答案

那些正在寻找 Swift 4 版本的人

Those who are looking for Swift 4 version

let spacing = NSMutableParagraphStyle()
spacing.lineSpacing = 7
spacing.alignment = .center
textView.typingAttributes = [NSAttributedStringKey.paragraphStyle.rawValue: spacing,
                             NSAttributedStringKey.font.rawValue: UIFont.systemFont(ofSize: 14)]

从 iOS 11 开始，Apple 会清除每个字符后的文本属性.所以你必须设置输入属性，

From iOS 11, Apple clears the text attributes after every character. So you have to set the typing attributes in,

func textViewShouldBeginEditing(_ textView: UITextView) -> Bool

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