我需要获取一组纬度和经度点并使用它们来绘制地图标记，但出于某种原因，我无法将它们存储为double值并将它们传递给我的方法。我已尝试使用以下方法注销值：
// Make the URL connection
NSString *urlAsString = @"...........";
NSURL *url = [NSURL URLWithString:urlAsString];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
// Error and success message handling.
[NSURLConnection
sendAsynchronousRequest:urlRequest
queue:queue
completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
if([data length] > 0 &&
error == nil){
NSData *jsonData = [NSData dataWithContentsOfURL:url];
if (jsonData != nil){
NSError *error = nil;
self.result = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
if(error == nil)
NSLog(@"Longitude: %@",[_result valueForKeyPath:@"merchants.branches.longitude"]);
NSLog(@"Name: %@", [_result valueForKeyPath:@"merchants.branches.name"]);
}
}
else if ([data length] == 0 &&
error == nil){
NSLog(@"Nothing was downloaded");
}
else if (error != nil){
NSLog(@"Error happened = %@", error);
}
}];
}
这是发回的数据：
2013-09-10 10:14:35.775 Longitude: (
(
"-115.118958"
),
(
"-114.985397"
),
(
"-115.285782"
),
(
"-115.114960"
),
(
"-115.108841"
),
(
"-115.280380"
),
(
"-115.120628"
),
(
"-115.166840"
),
(
"-115.224167",
"-115.172226"
)
)
2013-09-10 10:14:35.776 Name: (
(
"36.110806"
),
(
"36.033428"
),
(
"36.158482"
),
(
"36.029102"
),
(
"36.076591"
),
(
"36.143978"
),
(
"35.997353"
),
(
"36.106091"
),
(
"36.238758",
"36.067402"
)
)
现在我正在尝试创建一个for循环，它接受每个值并将它们存储为doublevalue，以便通过方法发送它。这是for循环：
for(NSDictionary *location in _result) {
CLLocationCoordinate2D annotationCoordinate =
CLLocationCoordinate2DMake([location valueForKey:@"merchants.branches.latitude"] doubleValue]]),
([location valueForKey:@"merchants.branches.longitude"] doubleValue]]);
Annotation *annotation = [[Annotation alloc] init];
annotation.coordinate = annotationCoordinate;
annotation.title = location[@"name"];
annotation.subtitle = nil;
[self.mapView addAnnotation:annotation];
我不确定发生了什么，但它一直向我发回错误。有任何想法吗？我知道这与我试图打电话的钥匙有关。
UPDATE-这是返回的内容：
categories = (
{
id = 69;
label = Medical;
parentId = 1;
},
{
id = 25;
label = Apparel;
},
{
id = 70;
label = "Exercise & Weight Loss";
parentId = 1;
},
{
id = 16;
label = "Sports & Fitness";
},
{
id = 1;
label = Health;
},
{
id = 48;
label = Women;
parentId = 25;
},
{
id = 2;
label = Travel;
},
{
id = 89;
label = Spas;
parentId = 23;
},
{
id = 78;
label = Outdoors;
parentId = 16;
},
{
id = 23;
label = Beauty;
},
{
id = 85;
label = Services;
}
);
currentCount = 10;
deals = (
{
categories = (
{
id = 1;
},
{
id = 16;
},
{
id = 70;
}
);
merchant = {
branches = (
{
id = 8718069;
}
);
id = 200014;
};
owner = {
id = 1;
};
price = "60.00";
sold = 1;
startDate = "2012-03-25 18:21";
startDateEpoch = 1332699660000;
terms = "";
tippedAtDate = "<null>";
tippedAtDateEpoch = "<null>";
tippingPoint = "<null>";
title = "$60 for Color/Cut/Style from Pin Ups Day Spa & Salon ";
url = "http://mediaengine.onebigplanet.com/d/public/redirectToMerchant.do?webService=true&offerId=520053";
value = "120.00";
},
{
categories = (
{
id = 1;
},
{
id = 23;
},
{
id = 89;
}
);
categories = (
{
id = 16;
},
{
id = 1;
}
);
description = "<p>Teeth whitening can help remove stains left by coffee, tea, hot chocolate, or\U00e2\U20ac\U201c\U00e2\U20ac\U201cthe most popular hot beverage of all\U00e2\U20ac\U201c\U00e2\U20ac\U201call of the above mixed together in a shoebox lined with wax paper (you drink it by punching a hole in the bottom). Smile brighter with this Groupon.</p>\n\n<h4>$99.99 for an In-Office Teeth-Whitening Treatment (Up to $217 Value)</h4>\n\n<p>In-office <a href=\"http://gr.pn/11LSlWo\">teeth whitening</a> treatments last for 60 minutes.<p></p>";
discountMoney = "117.01";
discountPercent = "53.92";
distanceInKms = "19.65";
distanceInMiles = "12.21";
endDate = "2016-01-28 06:59";
endDateEpoch = 1453964340000;
feedSource = 5;
id = 872004;
imageUrl = "https://img.grouponcdn.com/deal/pwZjaNwsgB74teJtHre2/Zc-440x267/v1/t440x300.jpg";
merchant = {
branches = (
{
id = 6462898;
}
);
id = 132923;
};
owner = {
id = 1;
};
price = "99.99";
sold = 30;
startDate = "2013-04-28 07:00";
startDateEpoch = 1367132400000;
terms = "<ul><li>Limit 1 per person, may buy 5 additional as gifts. Limit 1 per visit. Appointment required. 24hr cancellation notice required. Must be 14 or older.</li></ul>";
tippedAtDate = "2013-04-27 20:51";
tippedAtDateEpoch = 1367095860000;
tippingPoint = "<null>";
title = "$99 for a 60-Minute In-Office Teeth-Whitening Treatment at Teeth Whitening by T & G (Up to $217 Value)";
url = "http://mediaengine.onebigplanet.com/d/public/redirectToMerchant.do?webService=true&offerId=872004";
value = "217.00";
}
);
errorCode = "";
errorMessage = "";
feedSources = (
{
code = zozi;
id = 11;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/media/44611.png";
name = Zozi;
},
{
code = "amazon_local";
id = 163;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/media/87293.png";
name = AmazonLocal;
},
{
code = groupon;
id = 5;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/media/31513.jpg";
name = Groupon;
},
{
code = livingsocial;
id = 7;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/media/32636.png";
name = LivingSocial;
},
{
code = signpost;
id = 20;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/media/73440.png";
name = Signpost;
}
);
merchants = (
{
branches = (
{
city = "Las Vegas";
country = "United States";
countryIsoCode = USA;
distanceInKms = "10.51";
distanceInMiles = "6.53";
id = 9913587;
latitude = "36.110806";
longitude = "-115.118958";
name = "Las Vegas - 89119";
state = Nevada;
stateIsoCode = NV;
street = "4318 South Eastern Avenue";
telephone = "(702) 736-6119";
}
);
id = 229950;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net";
name = Prodentista;
},
{
branches = (
{
city = Henderson;
country = "United States";
countryIsoCode = USA;
distanceInKms = "14.91";
distanceInMiles = "9.27";
id = 8718069;
latitude = "36.033428";
longitude = "-114.985397";
name = "Henderson - 89012";
state = Nevada;
stateIsoCode = NV;
street = "12 W. Pacific Ave.";
telephone = 7025381248;
}
);
id = 200014;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net";
name = "Pin Ups Day Spa & Salon";
},
{
branches = (
{
city = "Las Vegas";
country = "United States";
countryIsoCode = USA;
distanceInKms = "19.65";
distanceInMiles = "12.21";
id = 6462898;
latitude = "36.158482";
longitude = "-115.285782";
name = "The Body Spa";
state = Nevada;
stateIsoCode = NV;
street = "8751 W Charleston Blvd.";
telephone = "";
}
);
id = 132923;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/31513.jpg";
name = "Teeth Whitening by T & G";
},
{
branches = (
{
city = "Las Vegas";
country = "United States";
countryIsoCode = USA;
distanceInKms = "3.35";
distanceInMiles = "2.08";
id = 15739653;
latitude = "36.029102";
longitude = "-115.114960";
name = "Las Vegas - 89123";
state = Nevada;
stateIsoCode = NV;
street = "8876 Eastern Avenue";
telephone = "";
}
);
id = 355896;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net";
name = "Body Heat";
},
{
branches = (
{
city = "Las Vegas";
country = "United States";
countryIsoCode = USA;
distanceInKms = "7.34";
distanceInMiles = "4.56";
id = 17028009;
latitude = "36.076591";
longitude = "-115.108841";
name = "Las Vegas - 89120";
state = Nevada;
stateIsoCode = NV;
street = "6230 Mcleod Drive, Suite 140";
telephone = "702-435-9478";
}
);
id = 430327;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net";
name = "Mcleod Wellness Center";
},
{
branches = (
{
city = "Las Vegas";
country = "United States";
countryIsoCode = USA;
distanceInKms = "18.09";
distanceInMiles = "11.24";
id = 6043133;
latitude = "36.143978";
longitude = "-115.280380";
name = "Las Vegas - 8645 W Sahara Ave.";
state = Nevada;
stateIsoCode = NV;
street = "8645 W Sahara Ave.";
telephone = "";
}
);
id = 121022;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/31513.jpg";
name = "Just Face It Medspa";
},
{
branches = (
{
city = Henderson;
country = "United States";
countryIsoCode = USA;
distanceInKms = "3.66";
distanceInMiles = "2.27";
id = 4563174;
latitude = "35.997353";
longitude = "-115.120628";
name = Henderson;
state = Nevada;
stateIsoCode = NV;
street = "3035 W Horizon Ridge Pkwy., Suite 100";
telephone = "";
}
);
id = 57146;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net/31513.jpg";
name = "Signature Institute of Aesthetic Sculpting";
},
{
branches = (
{
city = "Las Vegas";
country = "United States";
countryIsoCode = USA;
distanceInKms = "9.71";
distanceInMiles = "6.03";
id = 13769564;
latitude = "36.106091";
longitude = "-115.166840";
name = "Las Vegas - 89109";
state = Nevada;
stateIsoCode = NV;
street = "145 East Harmon Avenue";
telephone = "";
}
);
id = 272131;
logoUrl = "http://d2bvnbhf12ry1m.cloudfront.net";
name = "Luxury Suites International";
},
答案 0 :(得分：2)
我在这里看到的一些事情。
似乎在您的完成处理程序中，您再次呼叫您的Web服务。我不认为这会导致你的问题，但这是值得关注的。具体来说，这一行：NSData *jsonData = [NSData dataWithContentsOfURL:url];我认为应该是：NSData *jsonData = data;数据已经传递到您的块中，并且您已经在上面测试它作为错误条件。
我不认为数据的形成方式与您期望形成的方式相同。除非商家名称都是36.xxxxx我想知道你是否可以打印结果（假设没有敏感数据），那么我们可以看到它的结构如何？也许用NSLog(@"Longitude: %@",[_result valueForKeyPath:@"merchants.branches.longitude"]);替换NSLog(@"Results: %@",_result);？
更新： 好的，这有帮助。看起来你要回的不是数组，而是字典。看起来在那本词典中，你有一个属性商家，这是一系列词典。这些词典中的每一个都包含商家的记录。而且，这些商家中的每一个都在其中具有用于所有分支的另一个字典。所以你可能想要嵌套另一个循环来处理所有分支，或者只是在索引0处取分支。
所以，而不是你当前的循环结构：
for(NSDictionary *location in _result) {
CLLocationCoordinate2D annotationCoordinate =
CLLocationCoordinate2DMake([location valueForKey:@"merchants.branches.latitude"] doubleValue]]),
([location valueForKey:@"merchants.branches.longitude"] doubleValue]]);
Annotation *annotation = [[Annotation alloc] init];
annotation.coordinate = annotationCoordinate;
annotation.title = location[@"name"];
annotation.subtitle = nil;
[self.mapView addAnnotation:annotation];
你想要更像的东西：
NSArray *merchantsArray = [_result objectForKey:@"merchants"];
for(NSDictionary *location in merchantsArray) {
NSArray *branches = [location objectForKey:@"branches"];
for (NSDictionary *aBranch in branches) {
CLLocationCoordinate2D annotationCoordinate =
CLLocationCoordinate2DMake([[aBranch objectForKey:@"latitude"] doubleValue],
[[aBranch objectForKey:@"longitude"] doubleValue]);
Annotation *annotation = [[Annotation alloc] init];
annotation.coordinate = annotationCoordinate;
annotation.title = location[@"name"];
annotation.subtitle = nil;
[self.mapView addAnnotation:annotation];
}
}