我试图将所有文本字段都设为必填项，以确保用户不会将其留空。我尝试了此操作，但由于某种原因它无法正常工作。我觉得我的逻辑是正确的，但这是swift逻辑的问题
这是我的代码:
let title = txtTitle.text!
let location = txtWhere.text!
let when = txtWhen.text!
if title != nil && location != nil && when != nil {
var titleArray = [String]()
var whereArray = [String]()
var whenArray = [String]()
let titleObject = UserDefaults.standard.object(forKey: "saveTitle")
let whereObject = UserDefaults.standard.object(forKey: "saveLocation")
let whenObject = UserDefaults.standard.object(forKey: "saveWhen")
if let tempTitle = titleObject as? [String] {
titleArray = tempTitle
titleArray.append(txtTitle.text!)
print(titleArray)
}
else {
titleArray = [txtTitle.text!]
}
if let tempWhere = whereObject as? [String] {
whereArray = tempWhere
whereArray.append(txtWhere.text!)
//print(titleArray)
}
else {
whereArray = [txtWhere.text!]
}
if let tempWhen = whenObject as? [String] {
whenArray = tempWhen
whenArray.append(txtWhen.text!)
//print(titleArray)
}
else {
whenArray = [txtWhen.text!]
}
UserDefaults.standard.set(titleArray, forKey: "saveTitle")
UserDefaults.standard.set(whereArray, forKey: "saveLocation")
UserDefaults.standard.set(whenArray, forKey: "saveWhen")
txtTitle.text = ""
txtWhere.text = ""
txtWhen.text = ""
txtTime.text = ""
}
else
{
errMsg.isHidden = false
errMsg.text = "All fields are required"
}
}
最佳答案
要可靠地检查文本字段的text属性是否不是nil并且不为空，请使用
if let title = txtTitle.text, !title.isEmpty,
let location = txtWhere.text, !location.isEmpty,
let when = txtWhen.text, !when.isEmpty { ...
如果所有条件都通过，则三个变量将安全地展开。
关于ios - 验证文本字段Swift 3，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41023145/