UITextView 实现 placeholder

.h

UITextView *m_suggestTextField;//建议

UILabel *m_hint;

 

.m

 m_suggestTextField = [[UITextView alloc] initWithFrame:CGRectMake(kLayoutMargin, kLayoutMargin, APP_SCREEN_WIDTH - kLayoutMargin * 2, APP_SCREEN_WIDTH - 20)];
	m_suggestTextField.font = [UIFont systemFontOfSize:14];
	m_suggestTextField.keyboardType = UIKeyboardTypeNumbersAndPunctuation;//指定软键盘的类型
	m_suggestTextField.delegate = self;
    m_suggestTextField.autocorrectionType = UITextAutocorrectionTypeNo;
//    m_suggestTextField.clearButtonMode = UITextFieldViewModeWhileEditing;
    m_suggestTextField.backgroundColor = [UIColor blueColor];
	m_suggestTextField.tag = 11;
    [self.view addSubview:m_suggestTextField];
    
    
    m_hint = [[UILabel alloc]initWithFrame:CGRectMake(kLayoutMargin + 8, kLayoutMargin + 5, APP_SCREEN_WIDTH - kLayoutMargin * 2, 20)];
    m_hint.text = @"请填写您的意见...";
    m_hint.enabled = NO;//lable必须设置为不可用
    m_hint.backgroundColor = [UIColor clearColor];
    m_hint.textColor = UIColorFromRGB(0xeeeeee, 0.7);
    [self.view addSubview:m_hint];

 

-(void)textViewDidChange:(UITextView *)textView
{
//    self.examineText =  textView.text;
    if (textView.text.length == 0) {
        m_hint.text = @"请填写您的意见...";
        m_hint.hidden = NO;
    }else{
        m_hint.text = @"";
        m_hint.hidden = YES;
    }
}