从 IOS 中的 2 个数组创建 JSON

Question

我正在尝试创建字典以 POST JSON 数据到服务器：

NSArray *keys = [NSArray arrayWithObjects:@"lat", @"lon", nil];
NSArray *values = [NSArray arrayWithObjects: orderClass.extraLat, orderClass.extraLon, nil];
NSDictionary *postDict = [NSDictionary dictionaryWithObjects:values forKeys:keys];

这给了我：

{
    lat =     (
        "54.720746",
        "54.719206",
        "54.717466"
    );
    lon =     (
        "56.011108",
        "56.008510",
        "56.007031"
    );
}

但目标是 POST 格式数组中的数据：

[{"lat":"54.720746", "lon":"56.011108" },
 { "lat":"54.719206", "lon":"56.008510"},
 { "lat":"54.717466", "lon":"56.007031"}]

需要你的帮助。感谢关注！

Answer 1

正如我在评论中所说的那样——您需要倒转步骤来实现您的目标。首先是字典，然后是数组。你会得到你想要的。

NSArray *keys = [NSArray arrayWithObjects:@"lat", @"lon", nil];
NSArray *lats = [NSArray arrayWithObjects:@"1", @"2", @"3", nil];
NSArray *lons = [NSArray arrayWithObjects:@"4", @"5", @"6", nil];

// your way (not what you want)
NSArray *values = [NSArray arrayWithObjects: lats, lons, nil];
NSDictionary *postDict = [NSDictionary dictionaryWithObjects:values forKeys:keys];

// my recommendation based on what you want
NSMutableArray *postData = [[NSMutableArray alloc] init];
for (int i = 0; i < lats.count; i++) {
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
    [dict setObject:[lats objectAtIndex:i] forKey:@"lat"];
    [dict setObject:[lons objectAtIndex:i] forKey:@"lon"];
    [postData addObject:dict];
}

这将为您带来这些结果：

(lldb) po postDict
{
    lat =     (
        1,
        2,
        3
    );
    lon =     (
        4,
        5,
        6
    );
}

和

(lldb) po postData
<__NSArrayM 0x7ffb5be4d950>(
{
    lat = 1;
    lon = 4;
},
{
    lat = 2;
    lon = 5;
},
{
    lat = 3;
    lon = 6;
}
)

从 IOS 中的 2 个数组创建 JSON

create JSON from 2 arrays in IOS

ios

arrays

json

nsdictionary