我将UIWindow子类化,但由于某种原因, - (void)sendEvent:(UIEvent *)事件在与屏幕的任何交互中被调用2次。任何想法为什么会发生这种情况?
答案 0 :(得分:2)
出于调试目的,子类窗口(app delegate)和覆盖sendEvent:方法
-(void) sendEvent:(UIEvent *)event
{
NSLog(@"%@",event);
[super sendEvent:event];
}
最有可能的是,您会注意到负责TouchesBegan和TouchesEnded(用于点击)的事件。这可以通过继承View和覆盖触摸相关方法来测试。
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"tocuhesBegan");
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"touchesMoved");
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"touchesEnded");
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"touchesCancelled");
}
此外,尝试在视图上拖动/滑动以注意发送到视图的事件数量的变化:)
答案 1 :(得分:0)
为fingerDown和allFingersUp
调用sendEvent