Question

我有一个应用程序，可以计算两个日期之间的差异。它在模拟器中工作正常但在iOS设备上没有（iPad使用iOS 9）。

当我按下iPad上的“计算差异”按钮时，没有任何反应。在Xcode的调试区域中，我收到以下错误消息：

2015-11-16 08：33：32。2446日期至今计算器[369：64113] <CATransformLayer: >0x17eb95e0> - 在仅变换图层中更改属性masksToBounds将具有＆gt;无效果   2015-11-16 08：33：32.250

日期到日期计算器[369：64113] <CATransformLayer: 0x17d8ea30> - 在仅变换图层中更改＆gt;属性masksToBounds将无效   2015-11-16 08：33：32.251

日期到日期计算器[369：64113] <CATransformLayer: 0x17d95830> - 在仅变换图层中更改＆gt;属性masksToBounds将无效

我在SO上搜索了这个并且无法找到解决方案。

有人有任何建议吗？

谢谢！

请在下面找到View Controller代码：

import UIKit

类ViewController：UIViewController {

@IBOutlet weak var startDateTextField: UITextField!
@IBOutlet weak var endDateTextField: UITextField!
@IBOutlet weak var resultNumberOfDays: UILabel!
@IBOutlet weak var resultWeeksAndDays: UILabel!



override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor = UIColor(red: 210/255, green: 213/255, blue: 220/255, alpha: 1.0)

    let toolBar = UIToolbar(frame: CGRectMake(0, self.view.frame.size.height/6, self.view.frame.size.width, 40.0))

    toolBar.layer.position = CGPoint(x: self.view.frame.size.width/2, y: self.view.frame.size.height-20.0)

    toolBar.barStyle = UIBarStyle.BlackTranslucent

    toolBar.tintColor = UIColor.whiteColor()

    UIToolbar.appearance().barTintColor = UIColor(red: 0/255, green: 0/255, blue: 205/255, alpha: 1.0)

    let todayBtn = UIBarButtonItem(title: "Today", style: UIBarButtonItemStyle.Plain, target: self, action: "tappedToolBarBtn:")

    let okBarBtn = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Plain, target: self, action: "donePressed:")

    // let okBarBtn = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Done, target: self, action: "donePressed:")

    let flexSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: self, action: nil)

    let label = UILabel(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width / 3, height: self.view.frame.size.height))

    label.font = UIFont(name: "Helvetica Neue", size: 13)

    label.backgroundColor = UIColor.clearColor()

    label.textColor = UIColor.whiteColor()

    label.text = "Select a Start Date"

    label.textAlignment = NSTextAlignment.Center

    let textBtn = UIBarButtonItem(customView: label)

    toolBar.setItems([todayBtn,flexSpace,textBtn,flexSpace,okBarBtn], animated: true)

    startDateTextField.inputAccessoryView = toolBar


    let toolBar2 = UIToolbar(frame: CGRectMake(0, self.view.frame.size.height/6, self.view.frame.size.width, 40.0))

    toolBar2.layer.position = CGPoint(x: self.view.frame.size.width/2, y: self.view.frame.size.height-20.0)

    toolBar2.barStyle = UIBarStyle.BlackTranslucent

    toolBar2.tintColor = UIColor.whiteColor()

    UIToolbar.appearance().barTintColor = UIColor(red: 0/255, green: 0/255, blue: 205/255, alpha: 1.0)

    let todayBtn2 = UIBarButtonItem(title: "Today", style: UIBarButtonItemStyle.Plain, target: self, action: "secondTappedToolBarBtn:")

    let okBarBtn2 = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Plain, target: self, action: "secondDonePressed:")

    // let okBarBtn2 = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Done, target: self, action: "secondDonePressed:")

    let flexSpace2 = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: self, action: nil)

    let label2 = UILabel(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width / 3, height: self.view.frame.size.height))

    label2.font = UIFont(name: "Helvetica Neue", size: 13)

    label2.backgroundColor = UIColor.clearColor()

    label2.textColor = UIColor.whiteColor()

    label2.text = "Select an End Date"

    label2.textAlignment = NSTextAlignment.Center

    let textBtn2 = UIBarButtonItem(customView: label2)

    toolBar2.setItems([todayBtn2,flexSpace2,textBtn2,flexSpace2,okBarBtn2], animated: true)

     endDateTextField.inputAccessoryView = toolBar2

    // Do any additional setup after loading the view, typically from a nib.
}



override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}




func donePressed(sender: UIBarButtonItem) {

    startDateTextField.resignFirstResponder()

}


func secondDonePressed(sender: UIBarButtonItem) {

    endDateTextField.resignFirstResponder()

}




func tappedToolBarBtn(sender: UIBarButtonItem) {

    let dateformatter = NSDateFormatter()
    dateformatter.dateStyle = NSDateFormatterStyle.MediumStyle
    dateformatter.timeStyle = NSDateFormatterStyle.NoStyle
    startDateTextField.text = dateformatter.stringFromDate(NSDate())
    startDateTextField.resignFirstResponder()
}


func secondTappedToolBarBtn(sender: UIBarButtonItem) {

    let dateformatter = NSDateFormatter()
    dateformatter.dateStyle = NSDateFormatterStyle.MediumStyle
    dateformatter.timeStyle = NSDateFormatterStyle.NoStyle
    endDateTextField.text = dateformatter.stringFromDate(NSDate())
    endDateTextField.resignFirstResponder()
}



override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    self.view.endEditing(true)
}


@IBAction func textFieldEditing(sender: UITextField) {
    let datePickerView: UIDatePicker = UIDatePicker()
    datePickerView.datePickerMode = UIDatePickerMode.Date
    sender.inputView = datePickerView
    datePickerView.addTarget(self, action: Selector("datePickerValueChanged:"), forControlEvents: UIControlEvents.ValueChanged)

}



@IBAction func secondTextFieldEditing(sender: UITextField) {
    let datePickerView: UIDatePicker = UIDatePicker()
    datePickerView.datePickerMode = UIDatePickerMode.Date
    sender.inputView = datePickerView
    datePickerView.addTarget(self, action: Selector("secondDatePickerValueChanged:"), forControlEvents: UIControlEvents.ValueChanged)

}



func datePickerValueChanged(sender: UIDatePicker) {
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateStyle = NSDateFormatterStyle.MediumStyle
    dateFormatter.timeStyle = NSDateFormatterStyle.NoStyle
    startDateTextField.text = dateFormatter.stringFromDate(sender.date)

}



func secondDatePickerValueChanged(sender: UIDatePicker) {
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateStyle = NSDateFormatterStyle.MediumStyle
        dateFormatter.timeStyle = NSDateFormatterStyle.NoStyle
        endDateTextField.text = dateFormatter.stringFromDate(sender.date)

}


@IBAction func calculateDays(sender: UIButton) {

    if startDateTextField.text! == "" || endDateTextField! == "" {

        let alert2 = UIAlertController(title: "Oops!", message: "Please Select a Start Date!", preferredStyle: UIAlertControllerStyle.Alert)
        alert2.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert2, animated: true, completion: nil)


    }
    else {

        let start = String(startDateTextField.text!)
        let end = String(endDateTextField.text!)
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "MM-dd-yyyy"


        guard let startDate = dateFormatter.dateFromString(start), endDate = dateFormatter.dateFromString(end) else {
            // You don't have dates, show error(print("error"), do no nothing - your choice.
            return
        }


        // let startDate:NSDate = dateFormatter.dateFromString(start)!
        // let endDate:NSDate = dateFormatter.dateFromString(end)!
        let calendar = NSCalendar.currentCalendar()
        let components = calendar.components([.Day], fromDate: startDate, toDate: endDate, options: [])
        let secondNewString = "\(components.day) days"
        resultNumberOfDays.text = secondNewString

    }

}


@IBAction func calculateWeeksAndDays(sender: UIButton) {

    if startDateTextField.text! == "" || endDateTextField! == "" {

        let alert2 = UIAlertController(title: "Oops!", message: "Please Select an End Date!", preferredStyle: UIAlertControllerStyle.Alert)
        alert2.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert2, animated: true, completion: nil)
    }
    else {

    let start = String(startDateTextField.text!)
    let end = String(endDateTextField.text!)
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "MM-dd-yyyy"



        guard let startDate = dateFormatter.dateFromString(start), endDate = dateFormatter.dateFromString(end) else {
            // You don't have dates, show error(print("error"), do no nothing - your choice.
            return
 }


    // let startDate:NSDate = dateFormatter.dateFromString(start)!
    // let endDate:NSDate = dateFormatter.dateFromString(end)!
    let calendar = NSCalendar.currentCalendar()
    let components = calendar.components([.Day], fromDate: startDate, toDate: endDate, options: [])
    let days = components.day
    let weeks = components.day / 7
    let weeksanddays = days % 7
    let newString = "\(weeks) weeks + \(weeksanddays) days"
    resultWeeksAndDays.text = newString
}

}

@IBAction func resetLabels(sender: AnyObject) {

    resultNumberOfDays.text = ""
    resultWeeksAndDays.text = ""


}

}

Answer 1

我愿意打赌你的代码，即使在模拟器中也不会“正常工作”。例如，当我第一次点击文本字段时，日期选择器不会显示。我必须在背景屏幕上点击resignFirstResponder，然后再次点击文本字段以显示日期选择器。

问题是您没有实例化日期选择器并将其连接到文本字段，直到文本字段成为第一个响应者之后，您需要先执行之前的操作它成为第一响应者。（例如在viewDidLoad方法中。）

应用程序在模拟器（Xcode 7.1.1）中正常工作，但在iOS设备

1 个答案: