问题
Is there a way to detect line breaks occurred by the user or when the textview automatically changes line. I am going to change the height of the textview depending on the number of lines.
Any help appreciated.
回答1:
You can use the method proposed in this answer to find the occurrences of @"\n", the newline character. You can see if the string change using the textViewDidChange: protocol method (apple doc here).
If you want the heigh, directly, look at this answer. I think it can help.
回答2:
You can get the number of rows which is actually what i wanted to do.
numLines = textView.contentSize.height/textView.font.leading;
put this code into textViewDidChange:
来源：https://stackoverflow.com/questions/9252404/detect-linebreak-in-uitextview