确认网络环境

来源：互联网发布：刘建明知乎编辑：程序博客网时间：2024/05/29 16:23

网络编程开发web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过apple的审查的。系统自带的网络检查是原生的，AFNetworking也为我们添加了相关检测机制，所以这个直接在介绍AFNetworking的时候详解吧。

使用NSURLConnection下载数据

1. 创建对象NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];[NSURLConnection connectionWithRequest:request delegate:self];2. NSURLConnection delegate 委托方法- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {}- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {    }- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {    }- (void)connectionDidFinishLoading:(NSURLConnection *)connection {    }3. 实现委托方法- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {    self.receiveData.length = 0;//先清空数据}- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {    [self.receiveData appendData:data];}- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {    //错误处理}- (void)connectionDidFinishLoading:(NSURLConnection *)connection {    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;    NSString *returnString = [[NSString alloc]initWithData:self.receiveData encoding:NSUTF8StringEncoding];    firstTimeDownloaded = YES;}

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