转载连接：ios监听用户是否触摸了屏幕的一种实现
1、修改 AppDelegate 继承 UIApplication ，而不是直接继承 UIResponder
2、为了能让继承了UIApplication的AppDelegate起作用，需要将main.m中的更改为：
return UIApplicationMain(argc, argv, NSStringFromClass([AppDelegate class]), NSStringFromClass([AppDelegate class]));
3、重新sendEvent:(UIEvent *)event
- (void)sendEvent:(UIEvent *)event
{
[super sendEvent:event];//这里一定不能漏掉，否则app将不能成功启动。
NSSet *allTouches = [event allTouches];
if ([allTouches count] > 0)
{
UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
if (phase == UITouchPhaseBegan){
NSLog(@"send UITouchPhaseBegan");
}
if (phase == UITouchPhaseEnded){
NSLog(@"send UITouchPhaseEnded");
}
if (phase == UITouchPhaseMoved) {
}
if (phase == UITouchPhaseCancelled) {
}
}
}
