一，效果图。
二，工程图。
三，代码。
ViewController.h
#import <UIKit/UIKit.h> @interface ViewController : UIViewController<UITextViewDelegate>
{
//评论内容
UITextView *commentTextView;
} @end
ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//初始化点评内容
[self addCommentView];
}
#pragma -mark -functions
//初始化点评内容
-(void)addCommentView
{
//点评内容
commentTextView=[[UITextView alloc]initWithFrame:CGRectMake(50, 180, 300, 90)];
commentTextView.text=@"亲，您对商户感觉如何，环境怎样，服务态度如何。(500字符内)";
commentTextView.font=[UIFont systemFontOfSize:14];
commentTextView.backgroundColor=[UIColor redColor];
commentTextView.delegate=self;
[self.view addSubview:commentTextView];
}
#pragma mark - UITextView Delegate Methods
-(BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
if ([textView.text isEqualToString:@"亲，您对商户感觉如何，环境怎样，服务态度如何。(500字符内)"]) {
textView.text=@"";
}
return YES;
}
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if ([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}