我有一个NSTextView
我有很多文字。
如何在某个索引处获取字符的行号和列号?
让我们说,我在NSTextView
:
"This is just a\ndummy text\nto show you\nwhat I mean."
我需要第16个字符的行号和列号。在这种情况下:
Line: 2
Column: 2
如何使用Swift计算/获取此内容?
另一个例子:
"This is just a\ndummy text\nto show you\nwhat I mean."
我想要 15th (或16,如果\n
也被计算在内)的行号和行号,如下所示:
Line: 2
Column: 1
答案 0 :(得分:4)
你只需要使用String方法componentsSeparatedByString打破你的文本行,然后你只需要保持你的行,列和字符位置的计数如下:
extension String {
func characterRowAndLineAt(position: Int) -> (character: String, line: Int, column:Int)? {
var lineNumber = 0
var characterPosition = 0
for line in components(separatedBy: .newlines) {
lineNumber += 1
var columnNumber = 0
for column in line {
characterPosition += 1
columnNumber += 1
if characterPosition == position {
return (String(column), lineNumber, columnNumber )
}
}
characterPosition += 1
if characterPosition == position {
return ("\n", lineNumber, columnNumber+1 )
}
}
return nil
}
}
let myText = "This is just a\ndummy text\nto show you\nwhat I mean."
let result = myText.characterRowAndLineAt(position: 16) // "(.0 "d", .1 2, .2 1)"
let character = result?.character // "d"
let line = result?.line // 2
let column = result?.column // 1