我正在使用MIBadgeButton,它的效果非常好。
var appNotificationBarButton: MIBadgeButton! // Make it global
self.appNotificationBarButton = MIBadgeButton(frame: CGRect(x: 0, y: 0, width: 50, height: 40))
self.appNotificationBarButton.setImage(UIImage(named: "bell"), for: .normal)
self.appNotificationBarButton.badgeEdgeInsets = UIEdgeInsetsMake(10, 0, 0, 10)
self.appNotificationBarButton.addTarget(self, action: #selector(self.appNotificationClicked), for: .touchUpInside)
let App_NotificationBarButton : UIBarButtonItem = UIBarButtonItem(customView: self.appNotificationBarButton)
self.navigationItems.rightBarButtonItem = App_NotificationBarButton