touchesBegan：获取点的坐标 包含 范围

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    //获取点击点的坐标
    CGPoint touchPoint = [[touches  anyObject] locationInView:self];
    //空白处的范围
    CGRect rect = CGRectMake(0, 0, kWidth, kHeight - 220);
    
    //判断 点（CGPoint）是否在某个范围（CGRect）内
    if (CGRectContainsPoint(rect, touchPoint)) {
        [self dismissSelf];
    }
}