确定UITextView将截断字符串的位置

Question

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

我怎样才能determing显示的字符串和被截断掉的范围的范围内？

Answer 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 
} 
} 

，但它仅限于BreakLineByWord如果没有的话 “” 和截断，charIndex is 0

希望这会有所帮助:)