我有4个文本字段,一个按钮和一个图像,我想要实现的是,当按下按钮时,它应该警告用户有空的文本字段并显示指向空文本字段的图像,但是使用户将文本放入空白文本字段时,图像消失。谢谢
这是我的功能
func checkFields(){
let userEmail = user_EmailTxtField.text!
let userPassword = user_PassTxtField.text!
let passwordConfirm = pass_ConfirmTxtField.text!
let userPhone = user_PhoneTxtField.text!
//Set backArrow image to show input error to password
let imageName = "backArrow.png"
let image = UIImage(named: imageName)
let passImageView1 = UIImageView(image: image!)
passImageView1.frame = CGRect(x: 319, y: 331, width: 49, height: 49)
view.addSubview(passImageView1)
//Show Arrow image to password confirm error
let passConfirmImageView1 = UIImageView(image: image!)
passConfirmImageView1.frame = CGRect(x: 319, y: 394, width: 49, height: 49)
view.addSubview(passConfirmImageView1)
//Show arrow Image to email error
let emailImageView1 = UIImageView(image: image!)
emailImageView1.frame = CGRect(x: 319, y: 270, width: 49, height: 49)
view.addSubview(emailImageView1)
//Set image to phonetxt field error
let phoneImageView1 = UIImageView(image: image!)
phoneImageView1.frame = CGRect(x: 319, y: 209, width: 49, height: 49)
view.addSubview(phoneImageView1)
if userPhone.isEmpty {
phoneImageView1.isHidden = false
} else {
phoneImageView1.isHidden = true
}
if userEmail.isEmpty {
emailImageView1.isHidden = false
}
if userPassword.isEmpty {
passImageView1.isHidden = false
}
if passwordConfirm.isEmpty {
passConfirmImageView1.isHidden = false
}
}
最佳答案
您可以调用一个函数来处理检查,然后在文本不为空的情况下隐藏图像,如下所示:
1在为事件.editingChanged
创建textField的位置将一个目标添加到textField中:
user_EmailTxtField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
user_PhoneTxtField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
pass_ConfirmTxtField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
pass_ConfirmTxtField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
2设置用于检查文本字段是否被编辑的方法:
func textFieldDidChange() {
emailImageView1.isHidden = user_EmailTxtField.hasText
phoneImageView1.isHidden = user_PhoneTxtField.hasText
passImageView1.isHidden = pass_ConfirmTxtField.hasText
passConfirmImageView1.isHidden = pass_ConfirmTxtField.hasText
}
因此,如果将此示例应用于所有文本字段,则无需在
checkFields()
中进行检查,并且可以将方法重命名为setupTextFields()
,例如,仅将其用于创建文本字段在类的所有方法中使用图像视图的示例,但请确保在
viewDidLoad()
中进行初始化,例如,以避免在展开可选值时发现nil错误class YourClass: UIViewController {
// ImageView Reference
var emailImageView1: UIImageView!
// then your checkFields method
func checkFields() {
// code before
emailImageView1 = UIImageView(image: image!)
// code after
}
}