我正在尝试将默认值从保存到结构的 JSON 数据加载到文本字段。获取JSON数据的函数运行在viewdidload中。我在 viewdidlod 下有代码,它返回 nil 值。测试我在 IBAction 下运行的代码并且运行良好。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()
}
最佳答案
只需将 DispatchQueue.main.async
的使用移动到 getRates
调用的完成 block 中。
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
block 中使用的数据。
关于ios - 如何通过 View 设置默认 UITextField 值已加载,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55080107/