swift随笔textField insert

调整光标位置的方法

let userPaddingView =UIView(frame:CGRectMake(0,0,44,self.userNameTextField.frame.height))

self.userNameTextField.leftView= userPaddingView

self.userNameTextField.leftViewMode= .Always

在左侧添加图标的方法

let userImageView =UIImageView(image:UIImage(named:"User"))

//设置图标的位置

userImageView.frame.origin=CGPointMake(10,9)

self.userNameTextField.addSubview(userImageView)