仅将触摸事件转发到正在触摸的视图 [英] Forwarding touch events only to the views being touched

问题描述

我有一个UIWindow有一个文本字段，一个按钮和一个表。
我想能够跟踪屏幕上的所有触摸，然后将它们转发到被触摸的元素。

I have a UIWindow with a text field, a button, and a table. I would like to be able to track all the touches on the screen and then forward them to the element being touched.

我已经阅读了关于覆盖<$在 sendEvent nofollow>苹果文档，但我还是不明白：

I have read about overriding sendEvent in the Apple documentation but I still do not understand:

1. 如何使用 hitTest 检索正在触摸的元素


2. 如何转发触摸

1. How to use hitTest to retrieve the element being touched
2. How to forward touches

<这是我到目前为止。

This is what I have so far.

- (void) sendEvent:(UIEvent *)event
{

    for (UITouch *touch in [event allTouches])
    {
        /* Get coordinates of touch */
        CGPoint point = [touch locationInView:self];

        /* Get subview being touched */
        /* something like this???
           UIView *receiver = [self hitTest:point withEvent:event];            
         */

        /* Forward touch event to right view */
        /* how??? */

    }

    [super sendEvent:(UIEvent *)event];
}

谢谢。

推荐答案

我不确定这是最好的解决方案，但我下面已经发布 here 。

I am not sure this is the best solution but I am following what has been posted here.

基本上我有一个UIView子类覆盖整个空间。这样的类包含对可以被触摸的所有元素的引用。

Basically I have a subclass of UIView covering the entire space. Such class contains a reference to ALL the elements that can be touched. (I wish there was a way to avoid that)

 @interface SubclassUIView : UIView {       
    UITextField *text;
    UITableView *table;
    UIButton        *button;
    UIToolbar       *toolbar;
}

这是实现：

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    CGPoint tableHit = [table convertPoint:point fromView:self];
    CGPoint buttonHit = [button convertPoint:point fromView:self];
    CGPoint toolbarHit = [toolbar convertPoint:point fromView:self];
    CGPoint messageHit = [text convertPoint:point fromView:self];

    if ([table pointInside:tViewHit withEvent:event]) return table;
    else if ([button pointInside:buttonHit withEvent:event]) return button;
    else if ([toolbar pointInside:toolbarHit withEvent:event]) return toolbar;
    else if ([text pointInside:messageHit withEvent:event]) return text;

    return [super hitTest:point withEvent:event];
}

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