斯威夫特 5

Question

我想在UIPageController内添加UICollectionViewCell。我在里面创建了一个带有collectionViewCell的自定义nib文件。在单元格内，我添加了UIPageControl。

@IBOutlet weak var pageControl: UIPageControl!

    override func awakeFromNib() {
        super.awakeFromNib()

       self.isUserInteractionEnabled = true
        pageControl.isUserInteractionEnabled = true
        self.backgroundColor = UIColor.darkGray
       setupPageControl()
    }

private func setupPageControl() {

    pageControl.numberOfPages = 7
    pageControl.translatesAutoresizingMaskIntoConstraints = false
    pageControl.currentPageIndicatorTintColor = UIColor.orange
    pageControl.pageIndicatorTintColor = UIColor.lightGray.withAlphaComponent(0.8)
}

如何检测页面更改？点也在视图的中间，是否可以将它们放在中间？

Answer 1

来自Apple Documentation

当用户点击页面控件移动到下一页或上一页时，控件发送valueChanged事件以供处理代表。然后，委托可以将currentPage属性评估为确定要显示的页面。页面控件只前进一页在任何一个方向。当前查看的页面以白色表示点。根据设备的不同，会显示一定数量的点在它们被裁剪之前在屏幕上。

您也可以使用



        class ViewClient : WebViewClient  
        {
            MainActivity _activity;

            public int iTentativasLogin { get; private set; }
            public bool ErroReportado { get; private set; }


            public ViewClient(MainActivity activity)
            {
                _activity = activity;
            }


            public override void OnReceivedHttpAuthRequest(WebView view, HttpAuthHandler handler, string host, string realm)
            {
                Toast t ;
                if (Usuario.Length == 0 | Senha.Length == 0)
                {
                    t = Toast.MakeText(Android.App.Application.Context, "Usuário ou senha não preenchidos", ToastLength.Long);
                    t.SetGravity(GravityFlags.Center, 0, 0);
                    t.Show();
                    handler.Cancel();
                    ErroReportado = true;
                }
                else
                {
                    iTentativasLogin++; 

                    if (iTentativasLogin < 4)
                    {
                        handler.Proceed(Usuario, Senha);
                    }
                    else
                    {
                        t = Toast.MakeText(Android.App.Application.Context, "Usuário ou senha incorretos", ToastLength.Long);
                        t.SetGravity(GravityFlags.Center, 0, 0);
                        t.Show();
                        handler.Cancel();
                        ErroReportado = true;
                    }

                }
    }
}

Answer 2

斯威夫特 5

1) addTaget

您可以在 setupPageControl 函数上添加一个检测值变化的目标：

private func setupPageControl() {

    pageControl.numberOfPages = 7
    pageControl.translatesAutoresizingMaskIntoConstraints = false
    pageControl.currentPageIndicatorTintColor = UIColor.orange
    pageControl.pageIndicatorTintColor = UIColor.lightGray.withAlphaComponent(0.8)
    pageControl.addTarget(self, action: #selector(pageControlHandle), for: .valueChanged)
}

创建一个选择器来改变你想要的值：

@objc private func pageControlHandle(sender: UIPageControl){
    print(sender.currentPage)

}

检测UIPageControl页面更改

2 个答案:

斯威夫特 5

1) addTaget