iphone自定义UITextView的placeholder(2)

- (void)viewDidLoad  
{  
    [super viewDidLoad];  
    self.textView.placeholder = @"请添写你的信息……";  
      
    // Do any additional setup after loading the view, typically from a nib.   
}  
-(void)viewDidAppear:(BOOL)animated  
{  
    [super viewDidAppear:YES];  
    [self.textView addObserver];  
}  
-(void)viewDidDisappear:(BOOL)animated  
{  
    [super viewDidDisappear:YES];  
    [self.textView removeobserver];  
}  

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.textView.placeholder = @"请添写你的信息……";
    
// Do any additional setup after loading the view, typically from a nib.
}
-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:YES];
    [self.textView addObserver];
}
-(void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:YES];
    [self.textView removeobserver];
}