ios UITextView 提示文本

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定義兩個UITextView，一個用於輸入文本，一個用於顯示提示資訊，當輸入文本為空白時顯示提示資訊，否則不顯示提示資訊。

        //6.3.1文字內容提示        _contentTextViewTip = [[UITextView alloc] initWithFrame:CGRectMake(12, 5, WIDTH_SCREEN - 12 - 12, 105)];        if (_contentTextViewTip != nil)        {            _contentTextViewTip.text = POST_CONTENT_TIP;            _contentTextViewTip.font = [UIFont systemFontOfSize:16.0];            _contentTextViewTip.userInteractionEnabled = NO;            _contentTextView.delegate = self;            _contentTextViewTip.textColor = [[UIColor alloc] initWithRed:160/255.0 green:160/255.0 blue:160/255.0 alpha:1.0];            [scrollView addSubview:_contentTextViewTip];        }                //6.3.2文字內容文字框        _textViewRect = CGRectMake(12, 5, WIDTH_SCREEN - 12 * 2, 105);        if(_contentTextView != nil)        {            _contentTextView = [[UITextView alloc]initWithFrame:_textViewRect];            _contentTextView.backgroundColor = [UIColor clearColor];            _contentTextView.font = [UIFont systemFontOfSize:16.0];            //_contentTextView.textColor = [[UIColor alloc] initWithRed:160/255.0 green:160/255.0 blue:160/255.0 alpha:1.0];            //_contentTextView.text = @"說點什麼~";            [_contentTextView setScrollEnabled:YES];            _contentTextView.userInteractionEnabled = YES;            _contentTextView.showsVerticalScrollIndicator = YES;            CGSize size = CGSizeMake(WIDTH_SCREEN - 12 * 2, 600.0f);            [_contentTextView setContentSize:size];            _contentTextView.returnKeyType = UIReturnKeyDone;            _contentTextView.keyboardType = UIKeyboardTypeDefault;            _contentTextView.delegate = self;            [scrollView addSubview:_contentTextView];        }

#pragma mark _contentTextView Delegate/** *  文字改變時觸發的事件 */- (void)textViewDidChange:(UITextView *)textView{    NSLog(@"textViewDidChange：%@", textView.text);    if (textView == _contentTextView)    {                if ([textView.text isEqualToString:@""])        {            _contentTextViewTip.alpha = 1;        }        else        {            _contentTextViewTip.alpha = 0;        }    }}

ios UITextView 提示文本