Ios Can'；无法从Json读取特定数据？
我有包含多个对象的json数据，我已经将这些对象保存在数组中，但当我在单个对象中读取特定数据时，应用程序会在下一行崩溃。这是我的密码：Ios Can'；无法从Json读取特定数据？,ios,objective-c,json,nsarray,nsdictionary,Ios,Objective C,Json,Nsarray,Nsdictionary,我有包含多个对象的json数据，我已经将这些对象保存在数组中，但当我在单个对象中读取特定数据时，应用程序会在下一行崩溃。这是我的密码： NSString *myRequestString = [NSString stringWithFormat:@"getSavedSearches=yes&userId=40"]; // Create Data from request NSData *myRequestData = [NSData dataWithBytes: [myRequestSt
NSString *myRequestString = [NSString stringWithFormat:@"getSavedSearches=yes&userId=40"];
// Create Data from request
NSData *myRequestData = [NSData dataWithBytes: [myRequestString UTF8String] length: [myRequestString length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: url]];
// set Request Type
[request setHTTPMethod: @"POST"];
// Set content-type
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
// Set Request Body
[request setHTTPBody: myRequestData];
// Now send a request and get Response
NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil];
// Log Response
NSString *response = [[NSString alloc] initWithBytes:[returnData bytes] length:[returnData length] encoding:NSUTF8StringEncoding];
NSLog(@"%@",response);
NSArray *a = [NSJSONSerialization JSONObjectWithData:returnData options:NSJSONReadingMutableLeaves error:nil];
NSLog(@"Sunday: %@",[a description]);
NSDictionary *b = [a objectAtIndex:0];
NSLog(@"%@", [b valueForKey:@"SAVED_NAME"]);
{"0": {
"EVENT_ID": "19",
"NAME": "asdasd",
"ADDRESS1": "asdasd",
"ADDRESS2": "asdasd",
"START_DATE": "2015-06-04",
"END_DATE": "2015-06-12",
"START_TIME": "2 PM",
"END_TIME": "10 PM",
"SAVED": "1",
"SAVED_NAME": "hello",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-25 14:13:43"
}, "1": {
"EVENT_ID": "20",
"NAME": "asdasdasdasdasdasdasd",
"ADDRESS1": "asdasd",
"ADDRESS2": "",
"START_DATE": "2015-05-13",
"END_DATE": "2015-05-14",
"START_TIME": "3 PM",
"END_TIME": "4 PM",
"SAVED": "1",
"SAVED_NAME": "yellow",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-05-25 14:14:04"
}, "2": {
"EVENT_ID": "22",
"NAME": "Osama",
"ADDRESS1": "add",
"ADDRESS2": "",
"START_DATE": "2015-05-07",
"END_DATE": "2015-05-27",
"START_TIME": "1 AM",
"END_TIME": "3 PM",
"SAVED": "1",
"SAVED_NAME": "yo yo",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-05-26 11:38:14"
}, "3": {
"EVENT_ID": "23",
"NAME": "zxczxc",
"ADDRESS1": "zxczxc",
"ADDRESS2": "zxczxc",
"START_DATE": "2015-05-12",
"END_DATE": "2015-05-26",
"START_TIME": "10 AM",
"END_TIME": "2 PM",
"SAVED": "1",
"SAVED_NAME": "hahaha",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-05-26 11:55:24"
}, "4": {
"EVENT_ID": "24",
"NAME": "wqeqweqe",
"ADDRESS1": "qweqwe",
"ADDRESS2": "qweqwe",
"START_DATE": "2015-05-05",
"END_DATE": "2015-05-07",
"START_TIME": "2 AM",
"END_TIME": "9 AM",
"SAVED": "1",
"SAVED_NAME": "jajajaja",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-05-26 12:53:21"
}, "5": {
"EVENT_ID": "25",
"NAME": "uiooiuuio",
"ADDRESS1": "uiouio",
"ADDRESS2": "uiouio",
"START_DATE": "2015-05-05",
"END_DATE": "2015-05-13",
"START_TIME": "7 AM",
"END_TIME": "3 PM",
"SAVED": "1",
"SAVED_NAME": "asdasdasdasdasdasd",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-05-26 12:58:28"
}, "6": {
"EVENT_ID": "26",
"NAME": "asdasdasd",
"ADDRESS1": "asdasdasdas",
"ADDRESS2": "",
"START_DATE": "2015-05-14",
"END_DATE": "2015-05-13",
"START_TIME": "9 AM",
"END_TIME": "10 PM",
"SAVED": "1",
"SAVED_NAME": "xcvxcvxcv",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-05-26 16:48:43"
}, "7": {
"EVENT_ID": "37",
"NAME": "Osama",
"ADDRESS1": "asdasd",
"ADDRESS2": "asdasd",
"START_DATE": "2015-05-04",
"END_DATE": "2015-05-12",
"START_TIME": "2 PM",
"END_TIME": "10 PM",
"SAVED": "1",
"SAVED_NAME": "Osama",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-02 17:07:44"
}, "8": {
"EVENT_ID": "39",
"NAME": "asdas",
"ADDRESS1": "asdasd",
"ADDRESS2": "asdasd",
"START_DATE": "2015-06-03",
"END_DATE": "2015-06-12",
"START_TIME": "7 AM",
"END_TIME": "3 PM",
"SAVED": "1",
"SAVED_NAME": "asdasd",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-05 18:23:19"
}, "9": {
"EVENT_ID": "40",
"NAME": "asdasd",
"ADDRESS1": "asdasd",
"ADDRESS2": "asdasd",
"START_DATE": "2015-06-03",
"END_DATE": "2015-06-17",
"START_TIME": "8 AM",
"END_TIME": "3 PM",
"SAVED": "1",
"SAVED_NAME": "asdasdasdasd",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-05 18:26:06"
}, "10": {
"EVENT_ID": "41",
"NAME": "asdasd",
"ADDRESS1": "asdad",
"ADDRESS2": "as",
"START_DATE": "2015-06-09",
"END_DATE": "2015-06-24",
"START_TIME": "2 PM",
"END_TIME": "11 PM",
"SAVED": "1",
"SAVED_NAME": "qeqweqweqweqweqweqweqwewqeqweqweqwqwee",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-05 18:28:14"
}, "11": {
"EVENT_ID": "42",
"NAME": "asdasd",
"ADDRESS1": "asdasd",
"ADDRESS2": "qweqwe",
"START_DATE": "2015-06-03",
"END_DATE": "2015-06-03",
"START_TIME": "9 AM",
"END_TIME": "9 PM",
"SAVED": "1",
"SAVED_NAME": "iopiop",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-05 18:29:22"
}, "12": {
"EVENT_ID": "43",
"NAME": "asdasd",
"ADDRESS1": "as",
"ADDRESS2": "adad",
"START_DATE": "2015-06-10",
"END_DATE": "2015-06-18",
"START_TIME": "8 AM",
"END_TIME": "8 PM",
"SAVED": "1",
"SAVED_NAME": "bvnvnvnvbnvbnvbn",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-05 18:37:36"
}, "13": {
"EVENT_ID": "44",
"NAME": "asdad",
"ADDRESS1": "asdasd",
"ADDRESS2": "qweqwe",
"START_DATE": "2015-06-03",
"END_DATE": "2015-06-17",
"START_TIME": "9 AM",
"END_TIME": "4 PM",
"SAVED": "1",
"SAVED_NAME": "asdasdasd",
"UPDATED_BY": "New Event",
"UPDATED_AT": "2015-06-05 18:41:27"
}}
我需要读取每个对象的“保存的名称”数据并将其保存到数组中。顶层对象是一个字典；尝试：
NSDictionary *a = [NSJSONSerialization JSONObjectWithData:returnData
options:NSJSONReadingMutableLeaves
error:nil];
NSLog(@"Sunday: %@",[a description]);
NSDictionary *b = a[@"0"];
它不需要是一本字典，因为您正在使用字符串数字作为键；但就目前而言，它是一个字典。因为您获取的数据不是数组，所以它是一个NSDictionary，它有键“0”、“1” 所以试试看-
NSDictionary *a = [NSJSONSerialization JSONObjectWithData:returnData options:NSJSONReadingMutableLeaves
error:nil];
for(int i=0;i<[a count];i++)
{
NSDictionary *b = [a valueForKey:[NSString stringWithFormat:@"%d",i]];
NSLog(@"%@", [b valueForKey:@"SAVED_NAME"]);
}
NSDictionary*a=[NSJSONSerialization JSONObjectWithData:returnData选项：NSJSONReadingMutableLeaves
错误：无]；
对于（int i=0；iJSON响应，主要是在字典中。因此，您需要更改根对象，这意味着将NSArray更改为NSDictionary。这将很好地工作。从响应中可以清楚地看出，根对象是字典而不是数组。。。