iphone - How to get height of a line in UITextView -

as shown in above diagram ... lineheight height of orange box. how can height of blue box (i.e. lineheight + line spacing height)? thanks!

update: found the lineheight behaves differently depends on characters in content. if content in english, lineheight corrent (21, example, in default uitextview). however, when content mixed chinese characters, uifont lineheight still reported 21 while self.textview.contentsize.height increased differently:

english - adding 21 points each line chinese - adding 24 points each line 

update (sizewithfont:)

cgsize constrainedrect = cgsizemake(1000, 1000); cgsize rectenglish = [@"hello\nworld" sizewithfont:self.textview.font constrainedtosize:constrainedrect linebreakmode:uilinebreakmodewordwrap]; nslog(@"width: %.2f height: %.2f", rectenglish.width, rectenglish.height); cgsize rectchinese = [@"你\n好嗎" sizewithfont:self.textview.font constrainedtosize:constrainedrect linebreakmode:uilinebreakmodewordwrap]; nslog(@"width: %.2f height: %.2f", rectchinese.width, rectchinese.height); 

output:

width: 41.00 height: 42.00 width: 34.00 height: 42.00 

you have use

yourtextview.font.lineheight