这是一个WEB APP而非本地应用程序.请不要使用Objective-CNS命令.
所以我需要在iOS上检测"挤压"事件.问题是，我看到的每一个用于做手势或多点触控事件的插件或方法(通常)都与jQuery一起使用，并且是太阳底下每一个手势的一个额外插件.我的应用程序非常庞大，我对代码中的死木非常敏感.我所需要的只是检测到一个挤压，而使用像JGeture这样的东西正是满足我简单需求的方法.
Additionally, I have a limited understanding of how to detect a pinch manually. I can get the position of both fingers, can't seem to get the mix right to detect this. Does anyone have a simple snippet that JUST detects pinch?
You want to use the gesturestart, gesturechange, and gestureend events. These get triggered any time 2 or more fingers touch the screen.
根据你需要做什么捏手势，你的方法将需要调整.可以判断scale乘法器来确定用户的捏手势有多夸张.有关scale属性将如何运行的详细信息，请参见Apple's TouchEvent documentation.
node.addEventListener('gestureend', function(e) {
if (e.scale < 1.0) {
// User moved fingers closer together
} else if (e.scale > 1.0) {
// User moved fingers further apart
}
}, false);
You could also intercept the gesturechange event to detect a pinch as it happens if you need it to make your app feel more responsive.