[英]Adding values to complex dictionary Swift
我是Swift的新手,很難為復雜的字典添加新值。 下面的代碼更新了字典中已經存在的值(例如Jerry和Beth),但是如果我嘗試添加新值,則字典僅顯示兩個值,而不是三個。
var locals: [String: Dictionary<String, String>] = ["Jerry":["City":Destination.Seattle.rawValue,"Preference": TravellingPreference.Adventurer.rawValue, "Gender": Gender.Male.rawValue],"Beth":["City":Destination.Seattle.rawValue,"Preference":TravellingPreference.Foodie.rawValue, "Gender": Gender.Female.rawValue]]
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
let citySelected = localInput[0][pickerView.selectedRowInComponent(0)]
let preferenceSelected = localInput[1][pickerView.selectedRowInComponent(1)]
var localInformation = LocalsInformation().locals
if let name = nameTextField.text{
localInformation[name]?["City"] = citySelected
localInformation[name]?["Preference"] = preferenceSelected
localInformation[name]?["Gender"] = "Female"
print(localInformation)
}
}
localInformation[name]?["City"] = citySelected
?
基本上意味着(在這種情況下)如果localInformation[name]
為nil
,則什么也不做,這很可能是這種情況。 您可能想這樣做:
localInformation[name] = [
"City": citySelected,
"Preference": preferenceSelected,
"Gender": "Female"
]
話雖如此,我強烈建議您在任何可能的地方使用struct
而不是字典。 這將更易於處理(因為您不會誤拼密鑰,並且您不必處理盡可能多的可選鍵),並且它將使您的代碼更清晰。
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