import UIKit
class ViewController: UIViewController ,UITextFieldDelegate,UITextViewDelegate,UIActionSheet Delegate,UIAlertViewDelegate{
override func viewDidLoad() {
super.viewDidLoad()
let textField:UITextField = UITextField(frame: CGRectMake(10,120,200,30))
textField.borderStyle = UITextBorderStyle.RoundedRect
textField.placeholder = "請輸入用戶名"
//文字大小超過文本框長度時自動縮小字號洞慎，而不是隱藏顯示省略號
textField.adjustsFontSizeToFitWidth = true//當(dāng)文字超出文本框?qū)挾葧r浇借，自動調(diào)整文字大小
textField.minimumFontSize = 14//最小可縮小的字號
textField.textAlignment = NSTextAlignment.Right
// textField.co ntentVerticalAlignment = .Bottom
textField.delegate = self;
self.view.addSubview(textField)
//textField.borderStyle = .None
//textField.background = UIImage(named: "lalala")
textField.clearButtonMode = UITextFieldViewMode.Always
textField.returnKeyType = UIReturnKeyType.Done
}
func textFieldShouldReturn(textField:UITextField) ->Bool {
//使文本框在界面打開時就獲取焦點帝蒿，并彈出輸入鍵盤
textField.resignFirstResponder()
print(textField.text)
return true
}
}