iOS开发：简易天气预报
从网络上API通过http请求天气json文件数据，在本地解析显示在界面上，可以显示7天的天气预报以及当天的详细气象参数。
预览
思路
- 在网上找免费可用的天气预报接口
- 通过jsonmodel解析json file
天气预报API
度娘有个api商店凑合用
发送http请求获取数据本地解析显示
//http reques for the weather data through Internet
- (void)request:(NSString *)httpUrl withHttpArg:(NSString *)HttpArg
{
NSString *urlStr = [NSString stringWithFormat:@"%@?%@", httpUrl, HttpArg];
NSURL *url = [NSURL URLWithString:urlStr];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:10];
request.HTTPMethod = @"GET";
[request addValue:@"7941288324b589ad9cf1f2600139078e" forHTTPHeaderField:@"apikey"];
//send http request
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
if(connectionError)
NSLog(@"Httperror: %@%d", connectionError.localizedDescription, connectionError.code);
else
{
//get the response code
// responseCode = ((NSHTTPURLResponse *)response).statusCode;
//get the response json string
// responseString = [[NSString alloc] initWithData:data
// encoding:NSUTF8StringEncoding];
//
//
// responseString = [responseString stringByReplacingOccurrencesOfString:
// @"HeWeather data service 3.0"
// withString:@"HeWeather_data_service_3_0"];//leave out the white space
//get the response data and call back
responseData = data;
//process the responsdata
[self requestCallBack];
}
}];
}
- (IBAction)clicked:(id)sender
{
//send network request to get the weather data
httpArg = [NSString stringWithFormat:@"city=%@", self.cityTextField.text]; //the city name can be chinese or english
[self request:httpUrl withHttpArg:httpArg];
}
- (void)requestCallBack
{
NSError *error;
id jsonObj = [NSJSONSerialization JSONObjectWithData:responseData
options:NSJSONReadingMutableContainers error:&error];
if (!jsonObj || error)
NSLog(@"JSON parse failed!");
NSMutableArray *jsonArray = [jsonObj objectForKey:@"HeWeather data service 3.0"];
// NSLog(@"%@", jsonArray);
//fill the weather model, here not using JsonModel, just manual parse the json file
weatherModel = [[WeatherModel alloc] init];
weatherModel.city = jsonArray.firstObject[@"basic"][@"city"]; //because the json has only one big array
weatherModel.country = jsonArray.firstObject[@"basic"][@"cnty"];
weatherModel.curWeather = jsonArray.firstObject[@"now"][@"cond"][@"txt"];
weatherModel.tmperature = jsonArray.firstObject[@"now"][@"tmp"];
if([weatherModel.country isEqualToString:@"中国"]) //only china has the aqi data
{
weatherModel.pm25 = jsonArray.firstObject[@"aqi"][@"city"][@"pm25"];
weatherModel.airQuality = jsonArray.firstObject[@"aqi"][@"city"][@"qlty"];
}
NSMutableArray *dailyForecastArray = [jsonArray.firstObject objectForKey:@"daily_forecast"];
//fill the 7 day weather
NSMutableArray *dailyArray = [[NSMutableArray alloc] init];
for(int i = 0; i < dailyForecastArray.count; i++)
{
WeatherDailyModel *dailyModel = [[WeatherDailyModel alloc] init];
dailyModel.weatherDate = dailyForecastArray[i][@"date"];
dailyModel.dayWeather = dailyForecastArray[i][@"cond"][@"txt_d"];
dailyModel.nightWeather = dailyForecastArray[i][@"cond"][@"txt_n"];
dailyModel.tmp_min = dailyForecastArray[i][@"tmp"][@"min"];
dailyModel.tmp_max = dailyForecastArray[i][@"tmp"][@"max"];
[dailyArray addObject:dailyModel];
}
weatherModel.dailyWeatherDatas = [NSMutableArray arrayWithArray:dailyArray]; //cannot directly add object to this array
//display the the data in view
[_curWeatherLabel setNumberOfLines:6];
self.curWeatherLabel.text = [NSString stringWithFormat:@"%@\n%@\n%@\ntemperature: %@\nPM2.5: %@\n%@",
weatherModel.city,
weatherModel.country,
weatherModel.curWeather,
weatherModel.tmperature,
weatherModel.pm25,
weatherModel.airQuality];
[self.dailyWeatherTable reloadData];
//here is the example of JsonModel, it will automatically parse all we want
// weatherModel = [[WeatherModel alloc] initWithString:responseString
// error:&error];
//
//
// NSLog(@"%@", weatherModel.pm25);
}
#pragma mark - tableview delegate
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return weatherModel.dailyWeatherDatas.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = @"UITableViewCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
cell.backgroundColor = indexPath.row%2 ? [UIColor lightGrayColor]:[UIColor greenColor];
cell.textLabel.numberOfLines = 5;
//use weather data to set cell text
cell.textLabel.text = [NSString stringWithFormat:@"date: %@\nday weather: %@\nnight weather: %@\ntmperature: %@-%@",
[weatherModel.dailyWeatherDatas[indexPath.row] weatherDate],
[weatherModel.dailyWeatherDatas[indexPath.row] dayWeather],
[weatherModel.dailyWeatherDatas[indexPath.row] nightWeather],
[weatherModel.dailyWeatherDatas[indexPath.row] tmp_min],
[weatherModel.dailyWeatherDatas[indexPath.row] tmp_max]];
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
//set the tableview cell height
return 120;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"you clicked %dth row", indexPath.row);
UIAlertView *alerView = [[UIAlertView alloc] initWithTitle:@"message"
message:[NSString stringWithFormat:@"cell %d clicked", indexPath.row]
delegate:self
cancelButtonTitle:@"ok"
otherButtonTitles:nil];
[alerView show];
}
源代码下载
csdn： ios天气预报
github： WeatherReport