【Mac】NSTextField And AutoLayout: Autogrow height - Programmatically

【solution1】

Hence, a custom subclass of NSTextField can override this method to return a better value, such as the one provided by the cell's cellSizeForBounds: method:

- (NSSize) intrinsicContentSize;
{const CGFloat magic = -4;NSSize rv;if ([[self cell] wraps] && self.frame.size.height > 1)rv = [[self cell] cellSizeForBounds:NSMakeRect(0, 0, self.bounds.size.width + magic, 20000)];elserv = [super intrinsicContentSize];return rv;
}- (void) layout;
{[super layout];[self invalidateWordWrappedContentSizeIfNeeded];
}- (void) setFrameSize:(NSSize)newSize;
{[super setFrameSize:newSize];[self invalidateWordWrappedContentSizeIfNeeded];
}- (void) invalidateWordWrappedContentSizeIfNeeded;
{NSSize a = m_previousIntrinsicContentSize;NSSize b = self.intrinsicContentSize;if (!NSEqualSizes(a, b)){[self invalidateIntrinsicContentSize];}m_previousIntrinsicContentSize = b;
}

The reason I didn’t use cellSizeForBounds as you originally suggested was I couldn’t solve your problem – even when invalidating the intrinsic content size of the cell, cellSizeForBounds:continued to return the old size.

【solution2】

https://stackoverflow.com/questions/14107385/getting-a-nstextfield-to-grow-with-the-text-in-auto-layout

@interface TSTTextGrowth()
{BOOL _hasLastIntrinsicSize;BOOL _isEditing;NSSize _lastIntrinsicSize;
}@end@implementation TSTTextGrowth- (void)textDidBeginEditing:(NSNotification *)notification
{[super textDidBeginEditing:notification];_isEditing = YES;
}- (void)textDidEndEditing:(NSNotification *)notification
{[super textDidEndEditing:notification];_isEditing = NO;
}- (void)textDidChange:(NSNotification *)notification
{[super textDidChange:notification];[self invalidateIntrinsicContentSize];
}-(NSSize)intrinsicContentSize
{NSSize intrinsicSize = _lastIntrinsicSize;// Only update the size if we’re editing the text, or if we’ve not set it yet// If we try and update it while another text field is selected, it may shrink back down to only the size of one line (for some reason?)if(_isEditing || !_hasLastIntrinsicSize){intrinsicSize = [super intrinsicContentSize];// If we’re being edited, get the shared NSTextView field editor, so we can get more infoNSText *fieldEditor = [self.window fieldEditor:NO forObject:self];if([fieldEditor isKindOfClass:[NSTextView class]]){NSTextView *textView = (NSTextView *)fieldEditor;NSRect usedRect = [textView.textContainer.layoutManager usedRectForTextContainer:textView.textContainer];usedRect.size.height += 5.0; // magic number! (the field editor TextView is offset within the NSTextField. It’s easy to get the space above (it’s origin), but it’s difficult to get the default spacing for the bottom, as we may be changing the heightintrinsicSize.height = usedRect.size.height;}_lastIntrinsicSize = intrinsicSize;_hasLastIntrinsicSize = YES;}return intrinsicSize;
}@end

As a last note, I’ve never actually used auto layout myself – the demos look amazing, but whenever I actually try it myself, I can’t get it to work quite right and it makes things more complicated. However, in this case, I think it actually did save a bunch of work – without it, -intrinsicContentSize wouldn’t exist, and you’d possibly have to set the frame yourself, calculating the new origin as well as the new size (not too difficult, but just more code).

[solution3] height and width will change...

@implementation AutosizingTextField- (void)textDidBeginEditing:(NSNotification *)notification
{[super textDidBeginEditing:notification];isEditing = YES;
}- (void)textDidEndEditing:(NSNotification *)notification
{[super textDidEndEditing:notification];isEditing = NO;
}- (void)textDidChange:(NSNotification *)notification
{[super textDidChange:notification];[self invalidateIntrinsicContentSize];
}-(NSSize)intrinsicContentSize
{if(isEditing){NSText *fieldEditor = [self.window fieldEditor:NO forObject:self];if(fieldEditor){NSTextFieldCell *cellCopy = [self.cell copy];cellCopy.stringValue = fieldEditor.string;return [cellCopy cellSize];}}return [self.cell cellSize];
}
@end