UITextView默认文字提示

在UITextField中自带placeholder属性，可以用于提示输入框信息。但是UITextView并不具备此功能介绍两种方法来实现：第一种：初始化UITextView//首先定义UITextView  UITextView *textView = [[UITextView alloc] init];  textView.font = [UIFont systemFontOfSize:14];  textView.frame =CGRectMake(10, 0, cell.contentView.bounds.size.width-20, side);  textView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;  textView.backgroundColor = [UIColor whiteColor];  [cell.contentView addSubview:textView];  textView.hidden = NO;  textView.delegate = self;  //其次在UITextView上面覆盖个UILable,UILable设置为全局变量。  uilabel.frame =CGRectMake(17, 8, cell.contentView.bounds.size.width - side+10, 20);  uilabel.text = @"请填写审批意见...";  uilabel.enabled = NO;//lable必须设置为不可用  uilabel.backgroundColor = [UIColor clearColor];  [cell.contentView addSubview:uilabel];  实现UITextView的代理-(void)textViewDidChange:(UITextView *)textView  {      self.examineText =  textView.text;      if (textView.text.length == 0) {          uilabel.text = @"请填写审批意见...";      }else{          uilabel.text = @"";      }  }