//
//  SwiftyNavigationBar
//
//  Copyright (c) 2019-Present wlgemini <wangluguang@live.com>.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.

//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.

import UIKit


/// UIViewController(SwiftyNavigationBar)
extension UIViewController {
    
    /// snb
    public var snb: SwiftyNavigationBar {
        if let snb = objc_getAssociatedObject(self, &UIViewController._snbKey) as? SwiftyNavigationBar {
            return snb
        } else {
            let snb = SwiftyNavigationBar(viewController: self)
            objc_setAssociatedObject(self, &UIViewController._snbKey, snb, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
            return snb
        }
    }
    
    /// _snbKey
    private static var _snbKey: Void?
}
