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我想顯示的iOS工具欄中的按鈕,在理論上這是很簡單的,這應該工作:導航按鈕不會顯示出來
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let refresh = UIBarButtonItem(barButtonSystemItem: .Refresh, target: self, action: "refreshTapped")
navigationItem.leftBarButtonItem = refresh
navigationController?.toolbarHidden = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
不過事實並非如此。該按鈕不顯示。我嘗試重新啓動模擬器,從零開始創建項目等。所以我想這是我的Swift初學者頭腦處理問題的方式上的一個缺陷,但我根本沒有看到它。
您的視圖是否包含在UINavigationController中? –