ios - 更新 View Controller 中的 UIBarButtonItem

Question

我正在尝试从 View Controller 更新 UIBarButtonItem 色调颜色，但没有任何变化。我们不能使用 self.navigationItem.rightBarButtonItem 访问 View Controller 中的 UIBarButtonItem 吗？

[UIView animateWithDuration:.8 delay:0.5 options:UIViewAnimationOptionAllowUserInteraction animations:^ {
        //button.alpha = .01;  //don't animate alpha to 0, otherwise you won't be able to interact with it
        self.navigationItem.rightBarButtonItem.tintColor = [UIColor whiteColor];
    } completion:^(BOOL finished) {
        self.navigationItem.rightBarButtonItem.tintColor = [UIColor whiteColor];
    }];

Answer 1

我已经通过制作 UIBarButtonItem 的导出来尝试你的问题。它运行良好。您可以通过直接引用设置色调颜色。

这是代码

class ViewController: UIViewController {

@IBOutlet weak var addItem: UIBarButtonItem!
var  username = UITextField()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.


}

@IBAction func addItem(_ sender: UIBarButtonItem) {

    UIView.animate(withDuration: 20) {

        self.addItem.tintColor = UIColor.red
    }
}
}