Cocoa Text Height Calculation

gistfile1.m

// Initialize to your properties

self.wlNoteEditor = [[NSTextView alloc] initWithFrame:NSMakeRect(0, 0, 1, 1)];
[self.wlNoteEditor setAutoresizingMask:NSViewWidthSizable];
[[self.wlNoteEditor textContainer] setContainerSize:NSMakeSize(self.wlNoteEditorContainer.contentSize.width, FLT_MAX)];
[[self.wlNoteEditor textContainer] setWidthTracksTextView:YES];

CGFloat spacing = 7.0f;

NSMutableParagraphStyle *para = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[para setLineSpacing:spacing];
[para setMaximumLineHeight:16];
[para setMinimumLineHeight:16];
[self.wlNoteEditor setDefaultParagraphStyle:para];

// Make the linespaceing work, by setting a random placeholder, this is a bug in NSTextView
[self.wlNoteEditor setString:@"placeholder"];

[self.wlNoteEditor setTextContainerInset:NSMakeSize(17, 7)];
[self.wlNoteEditor setFont:[NSFont fontWithName:@"HelveticaNeue" size:13.0]];

.
.

[[self.wlNoteEditor textStorage] setAttributedString:someAtrString];

.
.

[self.wlNoteEditor.layoutManager glyphRangeForTextContainer:self.wlNoteEditor.textContainer];
CGFloat height = [self.wlNoteEditor.layoutManager usedRectForTextContainer:self.wlNoteEditor.textContainer].size.height;


Height is a 100 % perfect match now, adjust font etc, the text view is used with a dispatch_once to keep it off screen for continuous height calculation. Hope it helps! :