我已经以编程方式创建了UITextField
。现在,当我尝试获取其beginningOfDocument
属性时,它正在变为nil
。
代码如下:
public func addTextField(title:String?=nil) -> UITextField {
kWindowHeight -= 80.0
let txt: UITextField = UITextField(frame: CGRect(x: 13, y: 67, width: 213.00, height: 35));
txt.addTarget(self, action: "textFieldDidChange", forControlEvents: UIControlEvents.EditingChanged)
txt.borderStyle = UITextBorderStyle.RoundedRect
txt.layer.cornerRadius = 3
txt.layer.borderColor = UIColorFromRGB(0x1E8ADB).CGColor
txt.font = UIFont(name: kDefaultFont, size: 14)
txt.autocapitalizationType = UITextAutocapitalizationType.Words
txt.clearButtonMode = UITextFieldViewMode.WhileEditing
txt.layer.masksToBounds = true
txt.layer.borderWidth = 1.0
if title != nil {
txt.placeholder = title!
}
contentView.addSubview(txt)
return txt
}
在其他班级,我打电话给:
let textField = AlertView().addTextField("Send SMS")
var begining = textField.beginingOfDocument
最佳答案
如果仅创建UITextField,则立即尝试访问beginningOfDocument
属性,或者即使尝试将其添加到超级视图之后,也将始终获得uninitialized
值。
在UITextField成为第一个响应者之后,尝试检索该属性,然后查看结果:-)
祝好运。
关于ios - UITextField beginOfDocument属性返回nil,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/32524959/