vertically aligning text in NSTableView row

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隐瞒了意图╮
隐瞒了意图╮ 2021-02-05 12:47

I have a small problem with NSTableView. When I am increasing height of a row in table, the text in it is aligned at top of row but I want to align it vertically centered!

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  • 2021-02-05 13:04

    Even if this is a very old question with an accepted answer, here's an alternate solution:

    Go into the IB, select your NSTextField sitting in a NSTableCellView and add a new "Center Vertically in Container" constraint. You should also add horizontal constraints (which should probably be leading/trailing space set to 0 or whatever suits your needs).

    Used this in an NSOutlineView and worked like a charm. Performance wasn't an issue in my case, as I didn't have many cells, but I would expect it's not worse than manually calculating sizes.

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  • 2021-02-05 13:05

    Here is the Swift version of the code building on the answer above:

    import Foundation
    import Cocoa
    
    class VerticallyCenteredTextField : NSTextFieldCell
    {
    
        override func titleRectForBounds(theRect: NSRect) -> NSRect
        {
            var titleFrame = super.titleRectForBounds(theRect)
            var titleSize = self.attributedStringValue.size
            titleFrame.origin.y = theRect.origin.y - 1.0 + (theRect.size.height - titleSize.height) / 2.0
            return titleFrame
        }
    
        override func drawInteriorWithFrame(cellFrame: NSRect, inView controlView: NSView)
        {
            var titleRect = self.titleRectForBounds(cellFrame)
    
            self.attributedStringValue.drawInRect(titleRect)
        }
    }
    

    Then I set the height of the tableView heightOfRow in the NSTableView:

    func tableView(tableView: NSTableView, heightOfRow row: Int) -> CGFloat
    {
        return 30
    }
    

    Set the class of the NSTextFieldCell to be VerticallyCenteredTextField:

    enter image description here

    and the height of the TableViewCell

    enter image description here

    enter image description here

    Thanks Bryan for your help.

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  • 2021-02-05 13:06

    This is a simple code solution that shows a subclass you can use to middle align a TextFieldCell.

    the header

    #import <Cocoa/Cocoa.h>
    
    
    @interface MiddleAlignedTextFieldCell : NSTextFieldCell {
    
    }
    
    @end
    

    the code

    @implementation MiddleAlignedTextFieldCell
    
    - (NSRect)titleRectForBounds:(NSRect)theRect {
        NSRect titleFrame = [super titleRectForBounds:theRect];
        NSSize titleSize = [[self attributedStringValue] size];
        titleFrame.origin.y = theRect.origin.y - .5 + (theRect.size.height - titleSize.height) / 2.0;
        return titleFrame;
    }
    
    - (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
        NSRect titleRect = [self titleRectForBounds:cellFrame];
        [[self attributedStringValue] drawInRect:titleRect];
    }
    
    @end
    

    This blog entry shows an alternative solution that also works well.

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  • 2021-02-05 13:08

    @iphaaw's answer updated for Swift 4 (note I also added "Cell" on the end of the class name for clarity, which also needs to match the class name in Interface Builder):

    import Foundation
    import Cocoa
    
    class VerticallyCenteredTextFieldCell : NSTextFieldCell {
        override func titleRect(forBounds theRect: NSRect) -> NSRect {
            var titleFrame = super.titleRect(forBounds: theRect)
            let titleSize = self.attributedStringValue.size
            titleFrame.origin.y = theRect.origin.y - 1.0 + (theRect.size.height - titleSize().height) / 2.0
            return titleFrame
        }
    
        override func drawInterior(withFrame cellFrame: NSRect, in controlView: NSView) {
            let titleRect = self.titleRect(forBounds: cellFrame)
            self.attributedStringValue.draw(in: titleRect)
        }
    }
    
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