xamarin ios XibFree LinearLayout

本文详细介绍了如何利用XibFree框架创建自定义的UI布局,包括垂直线性布局、水平线性布局、按钮组件和图像视图的嵌套应用,展示了iOS应用程序界面设计的灵活性和强大功能。

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public override void LoadView()
{
    // This is a simple vertical LinearLayout.   ViewGroups are not implemented as UIViews - they're simply scaffolding for 
    // the layout of the contained NativeViews
    var layout = new LinearLayout(Orientation.Vertical)
    {
        Padding = new UIEdgeInsets(10,10,10,10),
        Gravity = Gravity.CenterVertical,
        SubViews = new View[] 
        {
            // A NativeView contains an iOS UIView
            new NativeView()
            {
                // This is the UIView
                View = new UIView(RectangleF.Empty)
                {
                    // Set properties here
                    BackgroundColor = UIColor.Red,
                },

                // This controls how it's laid out by its parent view group (in this case the outer linear layout)
                LayoutParameters = new LayoutParameters()
                {
                    Width = AutoSize.FillParent,
                    Height = 50,
                },
            },

            // Here we're nesting a horizontal linear layout inside the outer vertical linear layout
            new LinearLayout(Orientation.Horizontal)
            {
                // How to layout this linear layout within the outer one
                LayoutParameters = new LayoutParameters()
                {
                    Height = AutoSize.WrapContent,
                    Width = AutoSize.FillParent,
                },

                // Sub view collection
                SubViews = new View[]
                {
                    new NativeView()
                    {
                        // This time we're showing a UILabel
                        View = new UILabel(RectangleF.Empty)
                        {
                            BackgroundColor = UIColor.Purple,
                            Text="Hello World, this is a test to see if things wrap and measure correctly",
                            Lines = 0,
                            TextAlignment = UITextAlignment.Center,
                            TextColor = UIColor.White
                        },

                        LayoutParameters = new LayoutParameters()
                        {
                            Width = AutoSize.FillParent,
                            Height = AutoSize.WrapContent,      // Height calculated automatically based on text content!
                        },
                    },

                    new NativeView()
                    {
                        // Here we're hosting a button
                        View = new UIButton(UIButtonType.RoundedRect)
                        {
                        },
                        LayoutParameters = new LayoutParameters()
                        {
                            Width = AutoSize.WrapContent,               // Size of button determined by it's content
                            Height = AutoSize.WrapContent,
                            Gravity = Gravity.CenterVertical,
                            Margins = new UIEdgeInsets(0, 10, 0, 0),    // Put a margin on the left to separate it from the text

                        },
                        Init = v =>
                        {
                            // Because we can't set a button's title with a property, we use the Init property
                            // to execute some code.  Whatever action we assign to Init is simply executed immediately allowing
                            // us to to keep this code here with the rest of the layout definition
                            v.As<UIButton>().SetTitle("Hello", UIControlState.Normal);

                            // We can also setup an event handler
                            v.As<UIButton>().TouchUpInside += (sender,args) =>
                            {
                                new UIAlertView("Clicked", "", null, "OK").Show();
                            };
                        }
                    },
                }
            },
            new NativeView()
            {
                View = new UIImageView(UIImage.FromBundle("logo320.png"))
                {
                    ContentMode = UIViewContentMode.ScaleAspectFit,
                    //BackgroundColor = UIColor.White
                },
                LayoutParameters = new LayoutParameters()
                {
                    Width = AutoSize.FillParent,        // Overrall size determined by parent container width
                    Height = AutoSize.WrapContent,      // Height will be calculated by calling Measurer below
                    Margins = new UIEdgeInsets(10, 0, 0, 0)
                },
                Measurer = (v,s) =>
                {
                    // By supplying a custom measurer, we can do clever things like calculate a height for this
                    // image view that respects the aspect ratio of the image.  In this case the width is set
                    // to match the parent, whereas the height is wrapped.  To calculate the height, XibFree will
                    // call this function.
                    var iv = (UIImageView)v;
                    return new SizeF(s.Width, iv.Image.Size.Height * s.Width / iv.Image.Size.Width);
                },
            }
        },
    };

    // We've now defined our layout, to actually use it we simply create a UILayoutHost control and pass it the layout
    this.View = new XibFree.UILayoutHost(layout2);
    this.View.BackgroundColor=UIColor.Gray;

}

http://www.toptensoftware.com/xibfree/example_1

资源下载链接为: https://pan.quark.cn/s/d9ef5828b597 在本文中,我们将探讨如何通过 Vue.js 实现一个带有动画效果的“回到顶部”功能。Vue.js 是一款用于构建用户界面的流行 JavaScript 框架,其组件化和响应式设计让实现这种交互功能变得十分便捷。 首先,我们来分析 HTML 代码。在这个示例中,存在一个 ID 为 back-to-top 的 div 元素,其中包含两个 span 标签,分别显示“回到”和“顶部”文字。该 div 元素绑定了 Vue.js 的 @click 事件处理器 backToTop,用于处理点击事件,同时还绑定了 v-show 指令来控制按钮的显示与隐藏。v-cloak 指令的作用是在 Vue 实例渲染完成之前隐藏该元素,避免出现闪烁现象。 CSS 部分(backTop.css)主要负责样式设计。它首先清除了一些默认的边距和填充,对 html 和 body 进行了全屏布局,并设置了相对定位。.back-to-top 类则定义了“回到顶部”按钮的样式,包括其位置、圆角、阴影、填充以及悬停时背景颜色的变化。此外,与 v-cloak 相关的 CSS 确保在 Vue 实例加载过程中隐藏该元素。每个 .page 类代表一个页面,每个页面的高度设置为 400px,用于模拟多页面的滚动效果。 接下来是 JavaScript 部分(backTop.js)。在这里,我们创建了一个 Vue 实例。实例的 el 属性指定 Vue 将挂载到的 DOM 元素(#back-to-top)。data 对象中包含三个属性:backTopShow 用于控制按钮的显示状态;backTopAllow 用于防止用户快速连续点击;backSeconds 定义了回到顶部所需的时间;showPx 则规定了滚动多少像素后显示“回到顶部”按钮。 在 V
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