我试图从保存到结构的JSON数据加载默认值到文本字段。获取JSON数据的函数在viewdidload中运行。我有viewdidlod下的代码,它返回nil值。测试我在IBAction下运行的代码并且工作正常。如何让代码在viewdidload中正确运行?
override func viewDidLoad() {
super.viewDidLoad()
setUpPicker(textField: lenderName, pickerView: lenderNamePicker, PickerViewDelegate: self, PickerViewDataSource: self)
setUpPicker(textField: mortgageTerm, pickerView: mortgageTermPicker, PickerViewDelegate: self, PickerViewDataSource: self)
SelectionFunctions.MortgageTermSelection()
getRates (completion: { [weak self] in
self?.lenderName.reloadInputViews()
})
DispatchQueue.main.async {
let setupLender = Data.currentRateData.first(where: {$0.financialInstitution == "CIBC Mortgages"})
let setupRate = setupLender?.fiveYear
self.mortgageRate.text = setupRate?.percentage
print(setupRate)
print(setupLender)
print(Data.currentRateData.first?.financialInstitution)
}
lenderName.text = "CIBC Mortgages"
mortgageAmount.text = "$300,000.00"
orginalStartDate.text = ""
mortgageTerm.text = "5 Year"
//mortgageRate.text = "3.89%"
OrginalDiscount.text = "1.25%"
cashback.text = "$2,000"
lenderName.addDoneButton()
mortgageAmount.addDoneButton()
orginalStartDate.addDoneButton()
mortgageTerm.addDoneButton()
mortgageRate.addDoneButton()
orginalStartDate.addDoneButton()
cashback.addDoneButton()
OrginalDiscount.addDoneButton()
func setupDelegate(textField: UITextField){
textField.delegate = self
}
setupDelegate(textField: mortgageAmount)
setupDelegate(textField: mortgageRate)
setupDelegate(textField: OrginalDiscount)
setupDelegate(textField: cashback)
DatePicker()
}
只需在DispatchQueue.main.async
调用的完成块内移动getRates
。
getRates (completion: { [weak self] in
self?.lenderName.reloadInputViews()
DispatchQueue.main.async {
let setupLender = Data.currentRateData.first(where: {$0.financialInstitution == "CIBC Mortgages"})
let setupRate = setupLender?.fiveYear
self.mortgageRate.text = setupRate?.percentage
print(setupRate)
print(setupLender)
print(Data.currentRateData.first?.financialInstitution)
}
})
我假设getRates
调用正在加载DispatchQueue.main.async
块中使用的数据。