解決替換 導航欄 leftBarButtonItem 返回按鈕後 不能拖動返回

首先 必須用 customView 初始化 item 

customView 必須實現 UIGestureRecognizerDelegate 協議

var leftItem = UIBarButtonItem(customView: customView)

而後 添加
self.navigationController!.interactivePopGestureRecognizer.delegate = customView

醬紫 就能夠拖動返回了

腫麼樣造了吧