UITextView加占位符placeholder

@property (nonatomic ,retain) UITextView * contentText;

@property (nonatomic ,retain) NSString * placeholderText;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

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_contentText = [[UITextView alloc] initWithFrame:CGRectMake(10, 5,260, 120)];
    _contentText.backgroundColor = [UIColor clearColor];
    _contentText.text = _placeholderText;
    _contentText.textColor=[UIColor grayColor];
    _contentText.font = [UIFont systemFontOfSize:16];
    _contentText.returnKeyType = UIReturnKeyDone;
    _contentText.delegate = self;
    [self.view addSubview:_contentText];

}

//加占位符
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView{
    
    if ([textView.text isEqualToString:_placeholderText]) {
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    }
    textView.textColor=[UIColor blackColor];
    
    return YES;
}
- (void)textViewDidEndEditing:(UITextView *)textView{
    
    if ([textView.text isEqualToString:@""]) {
        
        textView.text=_placeholderText;
        textView.textColor=[UIColor grayColor];
    }
    
}

//点击回车放弃键盘

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    
    if ([text isEqualToString:@"\n"]) {
        
        [textView resignFirstResponder];
        
        return NO;
        
    }
    
    return YES;
    
}