确定 UITextView 将截断字符串的位置答案

【问题标题】：Determine where UITextView will truncate string确定 UITextView 将截断字符串的位置
【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？

【问题讨论】：

标签： ios string swift autolayout uitextview

【解决方案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:)

【讨论】：