Titanium UI 中的一个常见问题是在垂直布局中隐藏 View 。
假设我们有这个:
<Alloy>
<View id="wrapper" layout="vertical">
<Label id="sometimes_visible" top="20" height="50">I can be visible o not</Label>
<Label id="always_visible" top="20" height="50">I'm always visible</Label>
</View>
</Alloy>
而你,出于某种原因,需要隐藏 sometimes_visible
标签:
$.sometimes_visible.visible = false;
也许你期望的结果是:
_______________________________
| ________________________ |
| | I'm always visible | |
| ------------------------ |
|______________________________|
相反,你得到:
_______________________________
| |
| |
| |
| ________________________ |
| | I'm always visible | |
| ------------------------ |
|______________________________|
(always_visible
标签上方的多余空间)
这是因为在 Titanium 中,visible=false
只是将 View 设置为不可见,但它仍然占据其空间。因此,在垂直布局中,其他 View 不会重新排列以填补空白(这是正确的,即使不需要)。
解决这个问题的 fragment 如下:
/**
* hides a view nested into a layout=vertical container
* acts on top, bottom and height to simulate html-style display:none
* @param {Ti.View} view the view to be hidden
*/
function hideVertical(view) {
//store previous values
view.__originalValues = {
top: view.top,
bottom: view.bottom,
height: view.height
};
//set new values to simulate invisibility
view.top = 0;
view.bottom = 0;
view.height = 0;
view.visible = false;
}
/**
* shows a view nested into a layout=vertical container
* restore from hideVertical()
* @param {Ti.View} view the view to be shown
*/
function showVertical(view) {
//restore previous values
view = _.extend(view, view.__originalValues || {});
view.visible = true;
}
可以在 Controller 的代码中简单地实现:
hideVertical($.sometimes_visible);
关于android - Titanium:当布局=垂直时隐藏 View ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28024770/
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