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;
 
 
 
 

  
  
  
  



 
 

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