UITextfield控件

self.userPhone=UITextField()

1 设置左边leftview

letu_icon =UIImageView(frame: iconFrame)

u_icon.image=UIImage(named:"login_phone")

self.userPhone.leftView?.backgroundColor=THEMECOLOR

self.userPhone.leftView= u_icon

2 设置textfield框位移

self.userPhone.setValue(NSNumber(value:10), forKey:"paddingLeft")

3 设置占位字符大小

self.userPhone.setValue(UIFont.systemFont(ofSize:14), forKeyPath:"_placeholderLabel.font")