確定UITextView將截斷字符串的位置

Question

我有一個UITextView長字符串。文本視圖大小由自動佈局確定，並設置爲截斷文本。它看起來像這樣：

我怎樣才能determing顯示的字符串和被截斷掉的範圍的範圍內？

Answer 1

試試這個

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 
} 
} 

，但它僅限於BreakLineByWord如果沒有的話 「」 和截斷，charIndex is 0

希望這會有所幫助:)