带提示（hint）的多行文本输入--UITextView

 
  

   - 
   (
   void
   ) 
   viewDidLoad 
   {
    
  
  

   //...
  
  

   comments
   .
   text 
   = 
   @"请输入："
   ;
  
  

   comments
   .
   textColor 
   = 
   [
   UIColor 
   lightGrayColor
   ];
  
  

   isEmpty 
   = 
   YES
   ;
  
  

   //...
  
  

   }
  
  

   

  
  

   - 
   (
   BOOL
   )
   textViewShouldBeginEditing:
   (
   UITextView
   *
   )
   textView 
   {
    
  
  

   if 
   (
   isEmpty
   ) 
   {
    
  
  

   comments
   .
   text 
   = 
   @""
   ;
  
  

   comments
   .
   textColor 
   = 
   [
   UIColor 
   blackColor
   ];
  
  

   isEmpty 
   = 
   NO
   ;
  
  

   }
  
  

   return 
   YES
   ;
  
  

   }
  
  

   

  
  

   - 
   (
   void
   ) 
   textViewDidEndEditing:
   (
   UITextView
   *
   )
   textView 
   {
    
  
  

   if
   (
   comments
   .
   text
   .
   length 
   == 
   0
   ){
    
  
  

   comments
   .
   textColor 
   = 
   [
   UIColor 
   lightGrayColor
   ];
  
  

   comments
   .
   text 
   = 
   @"请输入："
   ;
  
  

   isEmpty 
   = 
   YES
   ;
  
  

   }
  
  

   }
  
  

    
  
  

   注意：需要在.h文件种添加协议<
   UITextViewDelegate>,在.m文件种设置协议 
   comments.delegate=self;