我有一个自定义窗口(应该在所有东西(包括键盘)的顶部)上显示一个叠加层内容，类似于您在按下设备中的音量增大/降低按钮时看到的叠加层。
因此，我制作了一个自定义窗口OverlayWindow，到目前为止一切正常，后面的窗口正常接收其事件。但是hitTest:withEvent:被调用了几次，有时甚至返回nil。我想知道这是否正常/正确吗？如果没有，我该如何解决？
// A small (WIDTH_MAX:100) window in the center of the screen. If it matters
const CGSize screenSize = [[UIScreen mainScreen] bounds].size;
const CGRect rect = CGRectMake(((int)(screenSize.width - WIDTH_MAX)*0.5),
((int)(screenSize.height - WIDTH_MAX)*0.5), WIDTH_MAX, WIDTH_MAX);
overlayWindow = [[CustomWindow alloc] initWithFrame:rect];
overlayWindow.windowLevel = UIWindowLevelStatusBar; //1000.0
overlayWindow.hidden = NO; // I don't need it to be the key (no makeKeyAndVisible)
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
// Find the front most window (with the highest window level) and
// call this method on that window. It should will make the event be
// forwarded to it
// Situation1: This method is called twice (or even more, it depend
// on the number of windows the app has) per event: Why? Is this the
// *normal* behaviour?
NSLog(@" ");
NSLog(@"Point: %@ Event: %p\n", NSStringFromCGPoint(point), event);
UIView *view = nil;
if (CGRectContainsPoint(self.bounds, point)) {
NSLog(@"inside window\n");
NSArray *wins = [[UIApplication sharedApplication] windows];
__block UIWindow *frontMostWin = nil;
[wins enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"win: %@\n", obj);
if ([obj windowLevel] >= [frontMostWin windowLevel] && obj != self) {
frontMostWin = obj;
}
}];
NSLog(@"frontMostWindow:%@\n finding a new view ...\n", frontMostWin);
CGPoint p = [frontMostWindow convertPoint:point fromWindow:self];
view = [frontMostWindow hitTest:p withEvent:event];
// Situation2: sometimes view is nil here, Is that correct?
}
NSLog(@"resultView: %@\n", view);
return view;
}
编辑:
我也注意到
hitTest:withEvent:总是返回nil，它也可以工作。只有当我打电话给overlayWindow.hidden = NO; [overlayWindow makeKeyAndVisible])并不总是返回nil中的hitTest:withEvent:。看起来像一个关键窗口需要正确执行点击测试方法？ 我在这里是否缺少有关事件转发的信息？
最佳答案
frontMostWindow意味着frontMostWin吗？
即使我们仅使用一个UIWindow，看起来hitTest:withEvent:也会在其上执行至少2次。所以，我想这很正常。
您可以在以下位置收到null
view = [frontMostWindow hitTest:p withEvent:event];
由于以下原因: