iOS 为 textView 添加 placeholder

为 textView 添加 placeholder

//自定义一个 placeholder 样式的 label

UILabel*placeholder = [[UILabelalloc]init];

    placeholder.text=@"请输入您的评价";

    placeholder.numberOfLines=0;

    placeholder.textColor=kColor(153,153,153);

    [placeholdersizeToFit];

    placeholder.font=kRegularFont(10);

    UITextView*textView = [[UITextViewalloc]initWithFrame:CGRectMake(15,143,SCREEN_WIDTH-30,48)];

    textView.backgroundColor=kColor(245,245,245);

    textView.textColor=kColor(153,153,153);

    textView.font=kRegularFont(10);

    [textViewsetValue:placeholderforKey:@"_placeholderLabel"]; //这句话必须写

    [textViewaddSubview:placeholder]; // 这句话必须写

    [self.mainScrolladdSubview:textView];