A category for UITextView
holder like UITextField
's placeholder
#import "UITextView+JHHolder.h"
self.textView.jh_holder.text = @"input here...";
self.textView.jh_holder.color = [UIColor brownColor];
self.textView1.jh_holder.text = @"在此输入...";
self.textView1.jh_holder.color = [UIColor orangeColor];