我想从PropertiesViewController.swift获取5个UITextFields的值,从ConditionsViewController获取8个开关(两个类都是TabController的一部分)。我想在用户点击saveMeter()后将用户输入的值插入到CoreData中。我的问题是当我尝试从另一个类中访问两个视图时,我有所有CRUD操作。当我点击Properties或ConditionsViewController上的保存按钮时,即使我只是输入一个值,文本和开关值也会返回nil。
该类名为CRUDController,这是必须重要的代码:
类CRUDController:UIViewController {
var条件:ConditionsViewController
var属性:PropertiesViewController
init(){
//我在下面理解我正在创建一个新实例而不是原始
//但是迅速强迫我开始他们,我不知道其他方式去做。
//我也试过像这样引用它们:
// var conditions:ConditionsViewController var properties:PropertiesViewController
//来自函数saveMeter,但文本中的值仍为空。
conditions = ConditionsViewController()
properties = PropertiesViewController()
super.init(nibName: nil, bundle:nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func saveMeter(){
//conditions.setConditions()
//properties.setProperties()
//creating empty meter
let m1 = Meter(context: MOC)
//这是我在Coredata中设置Meter对象的值
//conditions values
m1.newMeterCond1 = conditions.newMeterCond1Val
m1.newMeterCond2 = conditions.newMeterCond2Val
m1.newMeterCond3 = conditions.newMeterCond3Val
m1.oldMeterCond1 = conditions.oldMeterCond1Val
m1.oldMeterCond2 = conditions.oldMeterCond2Val
m1.oldMeterCond3 = conditions.oldMeterCond3Val
m1.oldMeterCond4 = conditions.oldMeterCond4Val
m1.oldMeterCond5 = conditions.oldMeterCond5Val
m1.cnc = conditions.CNCVal
//properties values
m1.outKW = properties.OutKWFromTextField
m1.outKWH = properties.OutKWHFromTextField
m1.outKVARH = properties.OutKVARHFromTextField
m1.multiplier = properties.multiplierFromTextField
m1.newMeterNumber = properties.newMeterNumberFromTextField
APPD.saveContext()
}
}
以下是我获取文本字段和开关的类:
类ConditionsViewController:UIViewController {
//variables to set
var newMeterCond1Val = Bool()
var newMeterCond2Val = Bool()
var newMeterCond3Val = Bool()
var oldMeterCond1Val = Bool()
var oldMeterCond2Val = Bool()
var oldMeterCond3Val = Bool()
var oldMeterCond4Val = Bool()
var oldMeterCond5Val = Bool()
var CNCVal = Bool()
@IBOutlet weak var oldMeterNumber: UILabel!
@IBOutlet weak var newMeterNumber: UILabel!
var oldMeterFromCell = String()
var newMeterFromTabChild = String()
//old meter conditions
@IBOutlet weak var oldMeterCond1: UISwitch!
@IBOutlet weak var oldMeterCond2: UISwitch!
@IBOutlet weak var oldMeterCond3: UISwitch!
@IBOutlet weak var oldMeterCond4: UISwitch!
@IBOutlet weak var oldMeterCond5: UISwitch!
//new meter conditions
@IBOutlet weak var newMeterCond1: UISwitch!
@IBOutlet weak var newMeterCond2: UISwitch!
@IBOutlet weak var newMeterCond3: UISwitch!
@IBOutlet weak var CNC: UISwitch!
@IBAction func saveMeter(_ sender: AnyObject) {
//this is where I am calling the function from CRUDController
CRUD.saveMeter()
}
}
类PropertiesViewController:UIViewController,UITextFieldDelegate {
var oldMeterFromCell = String()
//variables to set
var OutKWHFromTextField = Float()
var OutKWFromTextField = Float()
var OutKVARHFromTextField = Float()
var newMeterNumberFromTextField = String()
var multiplierFromTextField = Float()
@IBOutlet weak var OldMeterLabel: UILabel!
//new meter properties
@IBOutlet weak var OutKWH: UITextField!
@IBOutlet weak var OutKW: UITextField!
@IBOutlet weak var OutKVARH: UITextField!
@IBOutlet weak var newMeterNumber: UITextField!
@IBOutlet weak var multiplier: UITextField!
}
我尝试使用init()和必需的init()从每个类初始化UITextField和Switch,我也尝试使用方便的init(),我也用自定义set函数初始化它们。我还在CRUDController类的两个类上创建了一个实例,但是当我点击保存按钮时,文本值仍然为零。我不能使用segue,因为我有2个观点,即使我可以不想。我需要从CRUDController类访问原始的PropertiesController和ConditionsController,我不知道怎么做,因为我对委托的概念和如何使事情工作非常困惑所以我需要CODE来解决问题,没有概念
答案 0 :(得分:0)
我发现可以解决此问题的唯一方法是将所有开关,UITextfields,操作等从StoryBoard中的不同视图连接到一个可以访问所有元素的单个类。这样就不需要实例化一个Class来访问另一个Class。