在 MonoTouch 中缩放 UIScrollView [英] Zooming a UIScrollView in MonoTouch

问题描述

我正在尝试使用 MonoTouch 中的 UIScrollView 实现缩放功能，但我似乎无法让它工作.

I'm trying to implement zooming functionality using a UIScrollView in MonoTouch but I just can't seem to make it work.

我看过一些讨论设置委托的教程，但其中大部分是在 Obj-C 中，我无法转换为 C#.

I've looked at a few tutorials which talk about setting a Delegate but most of it is in Obj-C which I can't translate over to C#.

基本上，我在 Interface Builder 中有一个 UIScrollView，它有一个 UIImageView 作为子视图.

Basically, I have a UIScrollView in Interface Builder that has an UIImageView as a Subview.

我已将 UIScrollView 的 ContentSize 设置为图像的完整大小，并且还设置了最小/最大缩放比例.这是我的代码:

I've set the ContentSize of the UIScrollView to be the full size of the image and have also set a min/max zoom scale. Here's my code:

UIImage imgMap = new UIImage("img/map.png");
ivMap.Image = imgMap;
svMap.MinimumZoomScale = 1.0f;
svMap.MaximumZoomScale = 3.0f;
svMap.ContentSize = new System.Drawing.SizeF(ivMap.Frame.Width, ivMap.Frame.Height);

对我缺少的东西有什么想法吗?

Any ideas on what I'm missing?

编辑

我用@Geoff 提供的代码创建了一个新的 .xib 文件，但仍然没有运气，图像只是滚动但仍然没有缩放.

I've created a new .xib file with the code provided by @Geoff but still no luck, the image just scrolls but still doesn't zoom.

public override void ViewDidLoad ()
{
    base.ViewDidLoad ();

    UIScrollView sv = new UIScrollView (thisView.Frame);
    UIImageView iv = new UIImageView(UIImage.FromFile ("img/map.png"));

    sv.AddSubview (iv);
    sv.ContentSize = iv.Frame.Size;
    sv.MinimumZoomScale = 1.0f;
    sv.MaximumZoomScale = 3.0f;

    vwMineral.AddSubview(sv);
}

推荐答案

尝试:

var sv = new UIScrollView (window.Frame);
var iv = new UIImageView (UIImage.FromFile ("pat.jpg"));

sv.AddSubview (iv);
sv.ContentSize = iv.Frame.Size;
sv.MinimumZoomScale = 1.0f;
sv.MaximumZoomScale = 3.0f;
sv.MultipleTouchEnabled = true;
sv.ViewForZoomingInScrollView = delegate(UIScrollView scrollView) {
    return iv;
};      

window.AddSubview (sv);
window.MakeKeyAndVisible ();

这篇关于在 MonoTouch 中缩放 UIScrollView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！