Question

我对Xcode和iOS有点新意。我想从url请求获取数据，特别是浮点数据，并将其存储在数组中。例如，我有网址：

http://www.hazewatch.unsw.edu.au/get-data.php?latitudes=-33.91714104308085&longitudes=151.2331476539389&datetimes=2015-05-13%2003:27:52&pollutants=co

如果我在浏览器中输入该网址，则会显示文字＆＃39; co = 0.1124＆＃39;。如何将这些数据（0.1124）存入我的程序？这是我写的（下面），但这是不正确的。

NSString *stringPollution = [NSString stringWithFormat:@"http://www.hazewatch.unsw.edu.au/get-data.php?latitudes=-33.91714104308085&longitudes=151.2331476539389&datetimes=2015-05-13%2003:27:52&pollutants=co"];
NSURL *urlPollution = [NSURL URLWithString:stringPollution];
NSData *pollutionData = [NSData dataWithContentsOfURL:urlPollution];

这似乎是一项简单的任务，但我不知道该怎么做。任何帮助，将不胜感激。谢谢！

Answer 1

viewController.h

NSMutableData *responseData;
NSURLConnection *connection;

并添加<NSURLConnectionDataDelegate>

ViewDidLoad方法

NSString *urlString = @"http://www.hazewatch.unsw.edu.au/get-data.php?latitudes=-33.91714104308085&longitudes=151.2331476539389&datetimes=2015-05-13%2003:27:52&pollutants=co";
    NSURL *url = [NSURL URLWithString:urlString];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NO timeoutInterval:20.0f];


    responseData = [[NSMutableData alloc] init];
    connection = [NSURLConnection connectionWithRequest:request delegate:self];

ViewController.m

-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSString* newStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"Your Data :%@",newStr);
}

Answer 2

简单的伙伴只需用以下代码替换您的代码

NSString *stringPollution = [NSString stringWithFormat:@"http://www.hazewatch.unsw.edu.au/get-data.php?latitudes=-33.91714104308085&longitudes=151.2331476539389&datetimes=%@&pollutants=co",@"2015-05-13%2003:27:52"];
NSURL *urlPollution = [NSURL URLWithString:stringPollution];
NSData *pollutionData = [NSData dataWithContentsOfURL:urlPollution];

NSString *myString = [[NSString alloc] initWithData:pollutionData
                                           encoding:NSUTF8StringEncoding];


NSLog(@"%@",myString);

使用特定格式将网址添加到字符串中。
在网址中传递字符串。
以NSData格式从网址获取数据。
将NSData转换为字符串格式。
使用 NSLog

由于

从Obj-C（Xcode）中的URL获取数据（浮点数）

2 个答案: