UIButton的“触摸拖动/退出”点击区域的大小如何？ [英] What's up with the size of UIButton's Touch Drag/Exit hit area?

问题描述

好吧，我想最好是显示我的意思：

Well, I guess it is best to show what I mean:

您可以清楚地看到，一旦我们触摸了按钮并将其移出，

You can clearly see that once we've touched the button and moved out of it, a consequent move-in event triggers the button state change from far away.

虽然所有UIButton都具有这种行为，但我无法通过Google解决方案对其进行更改。

While this behavior is natural for all UIButtons, I couldn't google a solution to alter it.

p>

有没有办法减少这种类型的UIButton敏感度的点击区域？我希望将其缩小，因为我觉得按钮足够大了，可以提供更好的用户体验以及上/下声音效果。

Is there a way to reduce the hit area for this type of UIButton sensitivity? I want it reduced, because I feel that the button is large enough as it is, and it will provide a better user experience along with up/down sound effects.

UPD：以下UIButton的替代代码发布在另一个线程：

UPD: The following override code for UIButton was posted in another thread:

- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGFloat boundsExtension = 25.0f;
    CGRect outerBounds = CGRectInset(self.bounds, -1 * boundsExtension, -1 * boundsExtension);

    BOOL touchOutside = !CGRectContainsPoint(outerBounds, [touch locationInView:self]);
    if(touchOutside)
    {
        BOOL previousTouchInside = CGRectContainsPoint(outerBounds, [touch previousLocationInView:self]);
        if(previousTouchInside)
        {
            NSLog(@"Sending UIControlEventTouchDragExit");
            [self sendActionsForControlEvents:UIControlEventTouchDragExit];
        }
        else
        {
            NSLog(@"Sending UIControlEventTouchDragOutside");
            [self sendActionsForControlEvents:UIControlEventTouchDragOutside];
        }
    }
    return [super continueTrackingWithTouch:touch withEvent:event];
}

它更改了Drag In / Drag Out事件使用的点击区域扩展按钮的上/下状态切换与以前完全相同。

It alters the hit area extension used by Drag In/Drag Out events, yet button Up/Down states switch exactly the same way as they did before.

推荐答案

我不知道您是否仍在使用相同的问题，但是我能够通过在touchesEnded：withEvent：方法中使用类似的代码来修复它。

I don't know if you are still having the same issue, but I was able to fix it by using similar code in the touchesEnded:withEvent: method.

我还更改了该方法以添加touchEnter和dragInside，因为在当前代码中，那些事件仍然使用相同的界限。另外，我使每种情况都返回YES，以便不调用super（这会导致过早调用内部的触摸拖动）。

I also changed that method to add touchEnter and dragInside because with the current code, those to events still used the same bounds. In addition I made each of the cases return YES so that the super is not called (it would cause the touch drag inside to be called prematurely).

这是最后一个我最终得到的代码有两种方法：

Here is the final code that I ended up with, in two methods:

- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGFloat boundsExtension = 25.0f;
    CGRect outerBounds = CGRectInset(self.bounds, -1 * boundsExtension, -1 * boundsExtension);

    BOOL touchOutside = !CGRectContainsPoint(outerBounds, [touch locationInView:self]);
    if(touchOutside) {
        BOOL previousTouchInside = CGRectContainsPoint(outerBounds, [touch previousLocationInView:self]);
        if(previousTouchInside) {
            [self sendActionsForControlEvents:UIControlEventTouchDragExit];
            return YES;
        }
        else
        {
            [self sendActionsForControlEvents:UIControlEventTouchDragOutside];
            return YES;
        }
    }
    else {
        BOOL previousTouchOutside = !CGRectContainsPoint(outerBounds, [touch previousLocationInView:self]);
        if (previousTouchOutside) {
            [self sendActionsForControlEvents:UIControlEventTouchDragEnter];
            return YES;
        }
        else {
            [self sendActionsForControlEvents:UIControlEventTouchDragInside];
            return YES;
        }
    }
    return [super continueTrackingWithTouch:touch withEvent:event];
}


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGFloat boundsExtension = 25.0f;
    CGRect outerBounds = CGRectInset(self.bounds, -1 * boundsExtension, -1 * boundsExtension);

    BOOL touchInside = CGRectContainsPoint(outerBounds, [touch locationInView:self]);
    if (touchInside) {
        return [self sendActionsForControlEvents:UIControlEventTouchUpInside];
    }
    else {
        return [self sendActionsForControlEvents:UIControlEventTouchUpOutside];
    }
    return [super endTrackingWithTouch:touch withEvent:event];
}

注意：不必在最后返回方法的上级，但是为了完整起见，我把它留在那里。

NOTE: Returning the super of the method at the end is not necessary, but I left it in there for completeness.

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