我创建了一个函数,如果您输入超过四个字符,textField 将在角落显示一个带有绿色勾号的图像,但是当我删除 textField 内的所有字符时,它会显示一条错误消息,但我想删除该绿色勾选图像。我试过了
.removeFromSuperView
但它不起作用。
我很难从函数中访问变量以将其从 super View 中删除。
这是我在文本字段(最右边)中创建图像的代码
func addRightImage(txtField: UITextField, andImage img:UIImage)
{
let rightImageView = UIImageView(frame: CGRect(x: 0.0, y: 0.0, width: img.size.width, height: img.size.height))
rightImageView.image = img
txtField.rightView = rightImageView
txtField.rightViewMode = .always
}
这是我为firstName 文本字段创建的事件处理程序..
@objc func editing()
{
if(firstName.isEditing == true)
{
if(((firstName.text!).count) > 4)
{
validColorChange(subject: firstName)
addRightImage(txtField: firstName, andImage: #imageLiteral(resourceName: "tick"))
}
else if(firstName.text == "")
{
errorColorChange(subject: firstName)
<--- //I want to remove image here --->
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate)
sleep(1)
}
else
{
self.crossLabel.removeFromSuperview()
self.label.removeFromSuperview()
<--- //I want to remove image here. --->
}
}
我们将非常感谢您的时间和帮助! 谢谢!
最佳答案
首先将委托(delegate)分配给您的文本字段
然后将此委托(delegate)方法放入您的代码中
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField == txtEmail {
if textField.text != "" {
if (textField.text?.count)! < 4 {
txtEmail.rightViewMode = .never
}else {
let rightImageView = UIImageView(frame: CGRect(x: 0.0, y: 0.0, width: img.size.width, height: img.size.height))
rightImageView.image = #imageLiteral(resourceName: "ic_notification")
txtEmail.rightView = rightImageView
txtEmail.rightViewMode = .always
}
}
}
return true
}
或者如果您想更改代码,请输入
firstName.rightViewMode = .never
而不是.removeFromSuperView
关于swift - 如何访问函数变量并将其从 super View 中删除?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51906419/