What would be considered best practice, or what is most common, use values directly from UITextField throughout the program or assign the value to a variable and use the variable throughout your program?
Let's pretend that we need to do some calculations based on a number diplayed in a textField that came from a UIPickerView selection, what would you do, access the value directly from the textField or assign the value to a variable and use that variable?
Case 1 or case 2 from the code below?
CASE 1: Use values directly from UITextField to do your calculations
class ViewController{
let percentages = ["10","20","30","40","50"]// etc.
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let selectedPercentage = percentages[row]
myTextField.text = selectedPercentage
}
func tip(total:Double)->Double{
let tipAmount = total * Double(myTextField.text!)! / 100 // using value directly from textField
return tipAmount
}
}CASE 2: Assign value to a variable and use variable for your calcualtion
class ViewController{
let percentages = ["10","20","30","40","50"]// etc.
var percentage:Double = 0 // variable
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let selectedPercentage = percentages[row]
myTextField.text = selectedPercentage
percentage = selectedPercentage // assign selected value to variable
}
func tip(total:Double)->Double{
let tipAmount = total * percentage / 100 // using variable
return tipAmount
}
}What's considered better approach or more common, assuming the application will grow and the value from the textField will be used in multiple parts of the program.
