ios - iOS禁用UIButton 30分钟

Question

我正在制作一个应用程序，人们可以每小时最多请求两个订单。我想禁用“订单” UIButton一整整30分钟。有人可以建议这样做的最有效方法，但是即使该应用被终止，也可以完全阻止用户订购两次？谢谢。

Answer 1

这是我之前针对您的问题想到的方法。您将使用的三件事是NSDate，NSTimeInterval和NSUserDefaults

// I threw this in Xcode to aide me in typing this solution.
// You probably dragged a button from storyboard...leave it like that.
let orderButton: UIButton?

// Put toggleOrderButtonAvailability() in viewDidLoad and viewDidAppear

func toggleOrderButtonAvailability() {
    // get current date
    let currentDate = NSDate()

    // we're not sure if there's a value for this, but we're creating a variable for it
    // it will nil if the user hasn't placed an order
    var lastOrderDate: NSDate?

    // we're creating a variable to check
    var timeSinceLastOrder: NSTimeInterval?

    // if a value for the lastOrderDate saved in NSUserDefaults, then...
    if NSUserDefaults.standardUserDefaults().objectForKey("lastOrderDate") != nil {
        lastOrderDate = NSUserDefaults.standardUserDefaults().valueForKey("lastOrderDate") as? NSDate
        // calculate minutes since last order            
        // 1800 seconds = 60 seconds per minute X 30 minutes
        timeSinceLastOrder = (currentDate.timeIntervalSinceDate(lastOrderDate!)) / 1800

        if timeSinceLastOrder < 30 {
            orderButton?.enabled = false
            // Some alert to let the user know they can't order for another X minutes
            // TODO: you could create a class variable like "timeUntilButtonReenabled"
            //       and set it here, then the timer would run and call this method when it's
            //       done to re-enable the button. Set the timer in viewDidAppear()

        } else {
            orderButton?.enabled = true
        }
    }
}

您还需要在下订单时设置 lastOrderDate，并且可以调用我们刚创建的方法来在下订单时禁用按钮。

@IBAction func orderButtonAction(sender: UIButton) {

    // Whatever you do when you send an order

    // Set the lastOrderDate & disable the button
    let currentDate = NSDate()
    NSUserDefaults.standardUserDefaults().setObject(currentDate, forKey: "lastOrderDate")
    toggleOrderButtonAvailability()
}