[英]Objective C - Core Text, number of characters in a line?
Given an index for current character, how can I determine the number of line that the selected character is at? 给定当前字符的索引,我如何确定所选字符所在的行数?
Given a CTLine how can I determine the number of characters in it? 给定CTLine,如何确定其中的字符数?
For the first one: 对于第一个:
int currentCharacterIndex = 12; // You define this.
CFArrayRef lines = CTFrameGetLines(frame);
int currentLine = 0;
for (CTLineRef line in lines) {
currentLine++;
CFRange range = CTLineGetStringRange(line);
if (currentCharacterIndex > range.location)
break;
}
// Current line is now the line that the currentCharacterIndex resides at
For the second one: 对于第二个:
CFRange range = CTLineGetStringRange(line);
CFIndex length = range.length; // Number of characters
Can't be sure these work as I haven't tested them but it's worth a go. 由于我尚未测试它们,因此无法确定它们是否可以正常工作,但是值得一试。
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