Mac开发跬步积累(三):被忽略的 NSTabViewController

extension NSTabViewController {
    @available(OSX 10.10, *)
    public enum TabStyle : Int {
        /// Uses an NSSegmentedControl to show the UI for the tabs. The control is on the top of the view.
        case segmentedControlOnTop
        /// Uses an NSSegmentedControl to show the UI for the tabs. The control is on the bottom of the view.
        case segmentedControlOnBottom
        /// Automatically pushes the tabs into the window's toolbar as toolbar items, if non-nil. This style will cause the TabViewController to set its containing window's toolbar to its own and become that toolbar's delegate. The toolbar items can be customized or supplemented by overriding the relevant NSToolbarDelegate methods.
        case toolbar
        /// NSTabViewController will not provide any of its own tab control UI. Separate UI, such as a NSSegmentedControl or NSPopupButton, can be easily bound to the TabViewController. Or \c tabView.tabViewType can be changed for the TabView itself to draw the UI.
        case unspecified
    }
}

 open var transitionOptions: NSViewController.TransitionOptions

import Cocoa
class TabViewController: NSTabViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        1. 先设置NSTableView的样式为unspecified 
        tabStyle = .unspecified  
        2. 设置tabView的type样式 居左
        tabView.tabViewType = .leftTabsBezelBorder
    }
}

import Cocoa
class TabViewController: NSTabViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        1. 设置显示在顶部
        tabStyle = .segmentedControlOnTop      
        2. 设置显示在左边
        tabView.tabViewType = .leftTabsBezelBorder  
    }
}

import Cocoa

class TabViewController: NSTabViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func tabView(_ tabView: NSTabView, didSelect tabViewItem: NSTabViewItem?) {
        super.tabView(tabView, didSelect: tabViewItem)
        
        guard let itemView = tabViewItem?.view,
            let window = view.window
            else {return}
        let oldFrame = window.frame
        
        let newViewSize = itemView.fittingSize
        
        var newFrame = window.frameRect(forContentRect: NSMakeRect(oldFrame.origin.x, oldFrame.origin.y, newViewSize.width, newViewSize.height))
        
        let newY = oldFrame.origin.y - ( newFrame.size.height - oldFrame.size.height)
        newFrame.origin = NSMakePoint(oldFrame.origin.x, newY)
        
        NSAnimationContext.runAnimationGroup({ (context) in
            window.animator().setFrame(newFrame, display: window.isVisible)
        }, completionHandler: nil)
    }
}

   self.preferredContentSize = view.frame.size