最底部是按钮的时候，如果调用[datePickerView show]，会自动点击底部的按钮。

[daijuqing]

UIButton *dingButton = [[UIButton alloc]init];
[self.view addSubview:dingButton];
[dingButton mas_makeConstraints:^(MASConstraintMaker *make) {
    make.bottom.equalTo(self.view.mas_safeAreaLayoutGuideBottom);
    make.left.right.equalTo(self.view);
    make.height.equalTo(@45);
}];
[dingButton setTitle:@"Book Accommodation" forState:UIControlStateNormal];
[dingButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
dingButton.backgroundColor = [UIColor systemRedColor];
[dingButton addTarget:self action:@selector(abcded) forControlEvents:UIControlEventTouchUpInside];

如果设置按钮在最底部，调用show方法选择时间，调用show时，底部按钮会被自动点击。
只有设置不在最底部时候，才不会点击这个按钮，比如设置这个按钮 make.bottom.equalTo(self.view.mas_safeAreaLayoutGuideBottom).offset(-1);
距离底部1像素，也不会调用。