确定 UITextView 将截断字符串的位置

Posted 2023-03-15

【中文标题】确定 UITextView 将截断字符串的位置

【英文标题】：Determine where UITextView will truncate string

【发布时间】：2016-05-30 10:34:38

【问题描述】：

我有一个带有长字符串的UITextView。文本视图大小由自动布局确定，并设置为尾部截断文本。它看起来像这样：

如何确定显示的字符串范围和截断的范围？

【参考方案1】：

试试这个

class ViewController: UIViewController ,NSLayoutManagerDelegate

@IBOutlet weak var textView: UITextView!
var range :NSRange!
override func viewDidLoad() 
    super.viewDidLoad()


    textView.textContainer.layoutManager?.delegate = self
    let str = textView.text as NSString
    //Regardless of the repeated string
    range = str.rangeOfString("cillium adipisicing")
    print(range)




// Invoked while determining the soft line break point.  When NO, NSLayoutManager tries to find the next line break opportunity before charIndex
func layoutManager(layoutManager: NSLayoutManager, shouldBreakLineByWordBeforeCharacterAtIndex charIndex: Int) -> Bool

    // charIndex is in the string or not
    if range.location != NSNotFound && NSLocationInRange(charIndex, NSRange(location: range.location + 1, length: range.length - 1 )) 
        print("range of string is truncated -> charIndex is \(charIndex)")
    
    return  true

但仅限于BreakLineByWord，如果单词没有“”并被截断，charIndex is 0

希望对你有帮助:)