前言
鉴于柴静版《苍穹之下》的火爆，或许更多的人会关心环境，空气质量等环保因素，参考某学院的Swift版本的PM2.5的获取，本人自己写个Objective-C版本的。
基本原理
从服务器获取当前的空气质量数据，气象中心开放接口， 亚洲空气质量实时监控，， 参照人家的教程使用亚洲空气质量监控。 本地解析数据，获取PM2.5数值，进行显示。
具体实现NSNumber *str;-(void) loadData{= @”loading….”;NSURL *url = [NSURL URLWithString:@”http://aqicn.org/publishingdata/json”];NSString *post=@”postData”;NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];[request setHTTPMethod:@”POST”];[request setHTTPBody:postData];[request setTimeoutInterval:10.0];//GCD实现异步接口通信与UI更新的同步dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{NSOperationQueue *queue = [[NSOperationQueue alloc]init];[NSURLConnection sendAsynchronousRequest:requestqueue:queuecompletionHandler:^(NSURLResponse *response, NSData *data, NSError *error){if (error) {NSLog(@”Httperror:%@%d”, error.localizedDescription,error.code);}else{NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];NSLog(@”HttpResponseCode:%d”, responseCode);NSLog(@”HttpResponseBody %@”,responseString);NSData *resData = [[NSData alloc] initWithData:[responseString dataUsingEncoding:NSUTF8StringEncoding]];NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:resData options:NSJSONReadingMutableLeaves error:nil];NSLog(@”resultDic=%@”, resultDic);arr = [[resultDic valueForKey:@”pollutants”] valueForKey:@”value”];str = [[arr objectAtIndex:0] objectAtIndex:0];NSLog(@”PM2.5=%@”, [[arr objectAtIndex:0] objectAtIndex:0]);}}];dispatch_async(dispatch_get_main_queue(),^{= str.stringValue;});});}- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.[self loadData];// start reloadData}- (IBAction)reloadData:(id)sender {NSLog(@”Button Clicked”);[self loadData];NSLog(@”Button Clicked”);}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.}
详情请参考如下链接： 源码地址
没有伞的孩子必须努力奔跑!
