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;