我想知道是否可以使用swift为文本字段创建自定义背景,例如,需要4个字母,文本字段有4个正方形。thx
你是这样的意思吗?
// Background
txtField.backgroundColor = UIColor.greenColor()
// Placeholder
txtField.placeholder = "1"
// Corner radius
txtField.layer.cornerRadius = 8
// A Boolean indicating whether sublayers are clipped to the layer’s bounds
txtField.layer.masksToBounds = true
更新
这里有一个方法,它将随机化一个数字,然后根据生成的数字创建文本字段。当然,如果你已经有了一个数字,你就不需要随机功能了。您唯一需要做的就是将var i = 0; i < rand; i++
rand更改为您的变量。textFieldEditingChanged
功能是当用户尝试向textField
添加新字符并且检查每个textField
中只允许一个字符时发生的事件。
let rand = Int(arc4random_uniform(10) + 2)
for var i = 0; i < rand; i++ {
let myField: UITextField = UITextField (frame:CGRectMake(CGFloat(i * 30), 50, 25, 25));
myField.text = String(i)
myField.backgroundColor = UIColor.redColor()
myField.addTarget(self, action: "textFieldEditingChanged:", forControlEvents: UIControlEvents.EditingChanged)
self.view.addSubview(myField)
}
如果你只有一个String
,并且你想在textField
中填充每个字符,你可以这样做:
let word = "Car"
for var i = 0; i < word.characters.count; i++ {
let myField: UITextField = UITextField (frame:CGRectMake(CGFloat(i * 30), 50, 25, 25));
myField.text = String(word[word.startIndex.advancedBy(i)])
myField.backgroundColor = UIColor.redColor()
myField.addTarget(self, action: "textFieldEditingChanged:", forControlEvents: UIControlEvents.EditingChanged)
self.view.addSubview(myField)
}
点击文本字段的事件
func textFieldEditingChanged(target: UITextField){
if (target.text?.characters.count > 1){
target.text = target.text?.substringToIndex(target.text!.endIndex.predecessor())
}
}
更新更改应答器
声明一个变量var tagNumber = 0
,当您在for语句中循环并创建textFields时,只需将此行添加到myField.tag = i
即可。在textFieldEditingChanged
函数中,添加以下代码块:
if (target.tag < tagNumber){
let nextTag: NSInteger = target.tag + 1;
// Try to find next responder
if let nextResponder: UIResponder! =
target.superview!.viewWithTag(nextTag){
nextResponder.becomeFirstResponder()
}
}