导致“方法'foo'在类'Bar'中定义并且在AppCode中不可见”的原因

Given the following method:

给定以下方法：

- (void)sendEvent:(UIEvent *)event
{
    NSSet *allTouches = [event allTouches];

    if ([allTouches count] > 0)
    {
        _lastUserTouchTime = [[NSDate date] timeIntervalSince1970];
    }

    [super sendEvent:event];
}
- (void