我有一个验证字段的函数。正常工作:
//MARK: Validate everything before saving to database
func validateEverything() {
checkIfFieldsAreEmpty(textField: accountSetupST2.firstNameTextField, alertMessage: "First name field is empty", view: accountSetupST2.nameView)
checkIfFieldsAreEmpty(textField: accountSetupST2.lastNameTextField, alertMessage: "Last name field is empty", view: accountSetupST2.nameView)
checkIfFieldsAreEmpty(textField: accountSetupST2.dobTextField, alertMessage: "You DOB can not be empty", view: accountSetupST2.dobView)
checkIfTextViewsAreEmpty(textView: accountSetupST2.aboutMeTextView, alertMessage: "You need to write something about your self", view: accountSetupST2.aboutMeView)
}
我现在想要实现的是，如果这个函数返回 true，则触发另一个函数:
func saveToDatabaseAndGoToHomePage() {
print("Save and GO Home")
if validateEverything() != nil {
print("Good to go")
} else {
print("WRONGGGG")
// add code to database here
}
}
我已经尝试了几个小时，但仍然不知道该怎么做。 实际上，如果所有字段都有效，则不会触发另一个函数的错误。无论我试图与之比较，总是返回 true，即使它完成并且所有文件都经过验证。所以我无法触发另一个功能。
这是 checkIfFields 为空的函数:
> extension UIViewController {
//check if text field is empty
func checkIfFieldsAreEmpty(textField: UITextField, alertMessage: String, view: UIView) {
if (textField.text?.isEmpty)! {
let alertEmptyFields = UIAlertController(title: "Warning", message: alertMessage, preferredStyle: .alert)
let action = UIAlertAction(title: "OK", style: .cancel, handler: nil)
alertEmptyFields.addAction(action)
self.present(alertEmptyFields, animated: true, completion: nil)
view.layer.borderWidth = 0.5
view.layer.borderColor = UIColor.red.cgColor
} else {
view.layer.borderWidth = 0
}
}
最佳答案
你需要修改这个方法
extension UIViewController {
//check if text field is empty
func checkIfFieldsAreEmpty(textField: UITextField, alertMessage: String, view: UIView) ->Bool {
if (textField.text?.isEmpty)! {
let alertEmptyFields = UIAlertController(title: "Warning", message: alertMessage, preferredStyle: .alert)
let action = UIAlertAction(title: "OK", style: .cancel, handler: nil)
alertEmptyFields.addAction(action)
self.present(alertEmptyFields, animated: true, completion: nil)
view.layer.borderWidth = 0.5
view.layer.borderColor = UIColor.red.cgColor
return false
} else {
view.layer.borderWidth = 0
return true
}
}
还有这个
func validateEverything() ->Bool{
var validTextFields = 0
validTextFields += checkIfFieldsAreEmpty(textField: accountSetupST2.firstNameTextField, alertMessage: "First name field is empty", view: accountSetupST2.nameView) ? 1 : 0
validTextFields += checkIfFieldsAreEmpty(textField: accountSetupST2.lastNameTextField, alertMessage: "Last name field is empty", view: accountSetupST2.nameView) ? 1 : 0
validTextFields += checkIfFieldsAreEmpty(textField: accountSetupST2.dobTextField, alertMessage: "You DOB can not be empty", view: accountSetupST2.dobView) ? 1 : 0
validTextFields += checkIfTextViewsAreEmpty(textView: accountSetupST2.aboutMeTextView, alertMessage: "You need to write something about your self", view: accountSetupST2.aboutMeView) ? 1 : 0
return validTextFields == 4
}
那么你可以这样做
func saveToDatabaseAndGoToHomePage() {
print("Save and GO Home")
if validateEverything() {
print("Good to go")
} else {
print("WRONGGGG")
// add code to database here
}
}
希望对你有帮助
关于swift - 如何比较一个函数以便触发另一个函数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45069224/