[英]Extracting an NSDictionary from within another NSDictionary
我的应用程序具有一个NSDictionary
其中包含许多其他NSDictionary
。 如果我打印出此词典,则其内容如下:
oxip = {
created = "2014-02-10 14:42:59";
lastMsgId = "";
requestTime = "1.6434";
response = {
code = 001;
debug = "";
message = success;
request = getHierarchyByMarketType;
text = "\n";
williamhill = {
class = {
id = 1;
maxRepDate = "2014-02-10";
maxRepTime = "07:31:48";
name = "UK Football";
text = "\n";
type = (
{
id = 2;
lastUpdateDate = "2013-12-26";
lastUpdateTime = "13:32:54";
market = (
{
betTillDate = "2014-02-15";
betTillTime = "15:00:00";
date = "2014-02-15";
id = 140780553;
lastUpdateDate = "2014-02-10";
lastUpdateTime = "14:09:13";
name = "Queen of the South v Dundee - Match Betting";
participant = (
{
handicap = "";
id = 496658381;
lastUpdateDate = "2014-02-10";
lastUpdateTime = "14:09:13";
name = Dundee;
odds = "11/8";
oddsDecimal = "2.38";
text = "\n\n\n\n\n\n";
},
{
handicap = "";
id = 496658380;
lastUpdateDate = "2014-02-10";
lastUpdateTime = "14:09:13";
name = Draw;
odds = "5/2";
oddsDecimal = "3.50";
text = "\n";
},
{
handicap = "";
id = 496658379;
lastUpdateDate = "2014-02-10";
lastUpdateTime = "14:09:13";
name = "Queen of the South";
odds = "11/8";
oddsDecimal = "2.38";
text = "\n";
}
);
text = "\n";
time = "15:00:00";
}
我的应用程序以以下名称到达NSDictionary
的最佳方法是:
名称=“南方女王v邓迪-比赛投注”
不需要遍历每个单独的词典并找到其键对象?
您可以为此使用valueForKeyPath
。 它接受由点分隔的路径。 例:
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://dl.dropboxusercontent.com/u/1365846/21680479.json"]]
options:0
error:nil];
NSLog(@"%@", [dict valueForKeyPath:@"response.williamhill.class.type.market.name"]);
这取决于字典的表示形式。 如果williamhill
部件在变化,那么它当然不起作用。
如果没有遍历,就无法在地图数据类型(在本例中为NSDictionary
)中获取引用。 考虑一下此问题的简化版本:您有一个包含N个元素的链表,并且希望到达第N个元素。 因为这是一个链表,所以您必须遍历所有其他N-1个节点才能获取最后的引用。
NSDictionary
是基于哈希的数据类型,其中存储了键和值。 在您描述的情况下,您没有对嵌套对象(NSDictionary本身)的引用,因此您还必须遍历包含该对象的所有字典。
希望这可以帮助您指出正确的方向。
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