Iphone SDK：[错误]找不到“NSNetServiceDelegate”的协议声明

Question

此代码来自示例 在 .h 部分：

@interface ViewController : UITableViewController < NSNetServiceBrowserDelegate > {
        NSMutableArray * tableData;
        NSNetServiceBrowser * _browser;
        NSMutableArray * _foundServices;

        NSURLConnection * _connection;
        NSInputStream * _consumerStream;
        NSString * controllerHostName;
}
@property (nonatomic, retain) NSMutableArray * tableData;
@property (nonatomic, retain) NSNetServiceBrowser * _browser;
@property (nonatomic, retain) NSMutableArray * _foundServices;
@property (nonatomic, retain) NSURLConnection * connection;
@property (nonatomic, retain) NSInputStream * consumerStream;
@property (nonatomic, retain) NSString * controllerHostName;

在.m部分

    #import "ViewController.h"
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <unistd.h>
    #include <CFNetwork/CFNetwork.h>

    @synthesize tableData;
    @synthesize _browser;
    @synthesize _foundServices;
    @synthesize consumerStream = _consumerStream;
    @synthesize connection = _connection;
    @synthesize controllerHostName;

    - (void)viewWillAppear:(BOOL)animated {
            [super viewWillAppear:animated];

            _browser = [[NSNetServiceBrowser alloc] init];
            [_browser setDelegate:self];
            [_browser searchForServicesOfType:@"_service._tcp" inDomain:@""];
            [super viewWillAppear:animated];
    }


    - (void)viewWillDisappear:(BOOL)animated {
            [super viewWillDisappear:animated];

            [_browser stop];
            _browser.delegate = nil;
            [_browser release];
            _browser = nil;

            [_foundServices removeAllObjects];
    }
    - (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser didFindService:(NSNetService *)netService moreComing:(BOOL)moreServicesComing
    {
            self.controllerHostName = [NSString stringWithFormat:@"%@.%@", netService.name, netService.domain];
            NSLog(@"ControllerHost String is: %@", self.controllerHostName);
            NSLog(@"URL to use is === %@.%@", netService.name, netService.domain);
            if (!_foundServices) {
                    _foundServices = [[NSMutableArray alloc] init];
            }

            [_foundServices addObject:netService];

            [self.tableView reloadData];
    }

    - (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser didRemoveService:(NSNetService *)netService moreComing:(BOOL)moreServicesComing
    {
            [_foundServices removeObject:netService];
    }

    - (void)netServiceBrowserDidStopSearch:(NSNetServiceBrowser *)aNetServiceBrowser
    {

        [_foundServices removeAllObjects];
}

我像示例一样声明所有标题 但我收到错误消息“找不到“NSNetServiceDelegate”的协议声明 在.h

interface ViewController : UITableViewController < NSNetServiceBrowserDelegate > 

那么我是否遗漏了任何要声明的内容？ 该示例没有任何警告或错误

Answer 1

我认为它是在“NSNetServices.h”中定义的？

Answer 2

将此添加到您的标题中：

#import <Foundation/NSNetServices.h>

我从BonjourWeb Apple 示例代码项目中得到这个。

Answer 3

问题是一个未使用的函数。只需删除：

[self.tableView reloadData];

会好的！

Answer 4

我找到了类似答案的东西，只需删除

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [_browser stop];
    _browser.delegate = nil;
    [_browser release];
    _browser = nil;

    [_foundServices removeAllObjects];
}

该程序将获得我想要的 Netservice... 为什么？