iOS解决textfield子控件间距的问题

• ios textfield leftview rightview 设置子控件与文本的间距
  关键就是重写textfield

override func leftViewRect(forBounds bounds: CGRect) -> CGRect {
       var   rect  = super.leftViewRect(forBounds: bounds)
      rect.origin.x =   rect.origin.x  + 15
       return   rect
   }
   override func textRect(forBounds bounds: CGRect) -> CGRect {
               var   rect  = super.textRect(forBounds: bounds)
       rect.origin.x  =   rect.origin.x + 10
       return rect
   }
   
   override func placeholderRect(forBounds bounds: CGRect) -> CGRect {
       var   rect  = super.placeholderRect(forBounds: bounds)
       rect.origin.x  =   rect.origin.x + 10
       return rect
   }
   override func editingRect(forBounds bounds: CGRect) -> CGRect {
       var   rect  = super.editingRect(forBounds: bounds)
       rect.origin.x  =   rect.origin.x + 10
       return rect
   }   
}