触摸并下拉视图 [英] Touch and pull down a view

问题描述

我在界面顶部（状态栏下方）有一个uiview，只显示它的底部。

实际上，我想让红色uiview向下滑动以完全显示拖动，例如本机iOS中的通知中心，而不仅仅是通过点击按钮。 / p>

我应该用什么来触摸和拉下uiview以便它可以完全显示？

< img src =https://i.stack.imgur.com/ZotgY.pngalt =示例>

解决方案

创建 UIView 的子类。

覆盖 touchesBegan：withEvent 和 touchesMoved：withEvent 。

在 touchesBegan 或许进行视觉上的改变，以便用户知道他们正在触摸视图。
在touchesMoved中使用
[[touches anyObject] locationInView：self]
和
[ [触摸任何对象] previousLocationInView：self]

计算当前触摸位置与最后触摸位置之间的差异（检测向下拖动或拖动备份）。

然后，如果您是自定义绘图，请致电 [self setNeedsDisplay] 告诉您的观点重新绘制它的 drawRect：（CGRect）rect 方法。

注意：这假定这不使用多次触摸查看。

I have a uiview at the top of the interface (below the status bar) that only the bottom part of it is shown.

Actually, I want to make the red uiview to slide down to be entirely shown by drag such as the notificationcenter in the native iOS and not just by taping a button.

What should I use to "touch and pull down" the uiview so it could be shown entirely ?

解决方案

Make a subclass of UIView.

Override touchesBegan:withEvent and touchesMoved:withEvent.

In the touchesBegan perhaps make a visual change so the user knows they are touching the view. In the touchesMoved use [[touches anyObject] locationInView:self] and [[touches anyObject] previousLocationInView:self]

to calculate the difference between the current touch position and the last touch position (detect drag down or drag back up).

Then if you're custom drawing, call [self setNeedsDisplay] to tell your view to redraw in it's drawRect:(CGRect)rect method.

Note: this assumes multiple touch is not used by this view.

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