我在tabBarController中创建了一个导航barButton,我想在该按钮上调用委托方法。
/// Delegate
protocol DataExportDelegate {
func generateCSVFile()
}
class TabbarController: UITabBarController {
var exportDelegate: DataExportDelegate?
override func viewDidLoad() {
super.viewDidLoad()
///**barbutton**
let barButtonItem = UIBarButtonItem(
image: UIImage(named: "icon"),
style: UIBarButtonItem.Style.plain,
target: self, action: #selector(onClick(_:)
)
)
self.navigationItem.rightBarButtonItem = barButtonItem
}
@objc func onClick(_ sender: UIBarButtonItem) {
exportDelegate?.generateCSVFile()
}
}
/// ViewController
class viewController: UIViewController, DataExportDelegate {
var tabbar_Controller: TabbarController = TabbarController()
override func viewDidLoad() {
super.viewDidLoad()
tabbar_Controller.exportDelegate = self
}
func generateCSVFile() {
print("Delegate called")
}
}
答案 0 :(得分:0)
此
var tabbar_Controller: TabbarController = TabbarController()
创建一个不同于所提供的1的新实例,因此请替换
tabbar_Controller.exportDelegate = self
使用
(self.tabBarController as! TabbarController).exportDelegate = self