a date picker in alert view

datepicker.swift

    @IBAction func selectDate(_ sender: UIButton) {
        let datePicker = UIDatePicker()
        datePicker.datePickerMode = .date
        
        let alert = UIAlertController(title: "\n\n\n\n\n\n\n\n\n\n\n", message: nil, preferredStyle: .actionSheet)
        alert.view.addSubview(datePicker)
        
        datePicker.snp.makeConstraints { (make) in
            make.centerX.equalTo(alert.view)
            make.top.equalTo(alert.view).offset(8)
        }
        
        let ok = UIAlertAction(title: "确定", style: .default) { (action) in
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd"
            let dateString = dateFormatter.string(from: datePicker.date)
            print(dateString)
        }
        
        let cancel = UIAlertAction(title: "取消", style: .default, handler: nil)
        
        alert.addAction(ok)
        alert.addAction(cancel)
        
        present(alert, animated: true, completion: nil)
    }

Saved a life 5 years later. :)

Now that's an "out of the box" thinking.