我拿了文本字段出口集合并在那里绑定了六个文本字段。我想成为文本字段出口集合中下一个文本字段的FirstResponder。我从情节提要中给了文本字段标签 0 到 5。看,
主视图控制器:
class ViewController: UIViewController {
@IBOutlet var txtSignUp: [UITextField]!
var arrayPlaceHolder:NSArray!
override func viewDidLoad() {
super.viewDidLoad()
arrayPlaceHolder = NSArray(array: ["1","2","3","4","5","6"])
self.setTextFieldValue()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
private func setTextFieldValue(){
for txtField in txtSignUp{
let tagTxt = txtField.tag
txtField.attributedPlaceholder = NSAttributedString(string:arrayPlaceHolder[tagTxt] as! String, attributes:[NSForegroundColorAttributeName:UIColor.black])
if(tagTxt != ((arrayPlaceHolder.count) - 1)){
txtField.returnKeyType = .next
}
txtField.delegate = self
}
}
}
extension ViewController:UITextFieldDelegate{
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
for txt in txtSignUp{
let nextTxt = (textField.tag + 1)
if txt.tag == nextTxt {
txt.becomeFirstResponder()
break
}
}
return true
}
}
错误:
谁的视图不在窗口层次结构中!
解释:
在这段代码中,我不能成为成为成为FirstResponder 的下一个文本字段。
谁能帮我解决这个问题。