我有来自服务器的数据，我把它保存在NSMutableDic中但是当我更改NSMutabelDic中的值时，它给出了我在NSDic中无法改变的错误！ 这是错误：
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryI setObject:forKey:]: unrecognized selector sent to instance 0x7ae250c0'
这是我的示例服务器数据：
{
"data": {
"My_Tool_Box": {
"Visual Check": [
{
"que_cat_id": "1",
"question_id": "1",
"question_name": "Power leads",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "1",
"question_id": "2",
"question_name": "Power",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "1",
"question_id": "3",
"question_name": "Rcd is operational",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "1",
"question_id": "4",
"question_name": "ase to avoid damage",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "1",
"question_id": "5",
"question_name": "Safety guards if fitted to machine ARE OPERATIONAL AND ARE NOT DAMAGED",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "1",
"question_id": "6",
"question_name": "ase to avoid damage",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "1",
"question_id": "7",
"question_name": "ase to avoid damage",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
}
],
"Operational checks": [
{
"que_cat_id": "2",
"question_id": "8",
"question_name": "ase to avoid damage",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "2",
"question_id": "9",
"question_name": "ase to avoid damage",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
},
{
"que_cat_id": "2",
"question_id": "10",
"question_name": "ase to avoid damage",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
}
],
"Operating instructions": [
{
"que_cat_id": "3",
"question_id": "11",
"question_name": "ase to avoid damage",
"question_ans": "",
"question_ans_comments": "",
"question_options": {
"1": "Yes",
"2": "No",
"3": "N/A",
"4": "Comment"
}
}
]
}
},
"status": "success",
"message": "Question Listing"
}
所以我必须改变question_ans & question_ans_comments的值，所以当我改变它时，我会得到错误，如上所述。
这是我已经应用的方式：
NSMutableDictionary *newDict = [[NSMutableDictionary alloc] init];
NSDictionary *oldDict = (NSDictionary *)[dataArray objectAtIndex:0];
[newDict addEntriesFromDictionary:oldDict];
[newDict setObject:@"Don" forKey:@"Name"];
[dataArray replaceObjectAtIndex:0 withObject:newDict];
我没有顺序索引，就像我如何替换那个关键对象！有什么简单的方法可以在这里申请吗？
这是我重置值的方式：
[[[arrayGlobal valueForKey:[arrayAllColumn objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] setObject:@"12" forKey:@"question_ans"];
我也试过这个：
NSDictionary *oldDict = (NSDictionary *)[[arrayGlobal valueForKey:[arrayAllColumn objectAtIndex:0]] objectAtIndex:0];
NSMutableDictionary *newDict = [NSMutableDictionary dictionaryWithDictionary:oldDict];
[newDict setObject:@"12" forKey:@"question_ans"];
[[[[arrayGlobal valueForKey:[arrayAllColumn objectAtIndex:0]] objectAtIndex:0] mutableCopy] replaceObjectAtIndex:0 withObject:newDict];
给出同样的错误。
答案 0 :(得分：2)
下载these categories课程并将其添加到您的项目中：
#import "NSDictionary+FRMutableDeepCopy.h"
NSMutableDictionary *dixDataMutable = [[dixResponse objectForKey:@"data"] mutableDeepCopy];
之后，您可以更新嵌套字典。
答案 1 :(得分：0)
尝试使用此方法
toggled例如
+ (instancetype)dictionaryWithDictionary:(NSDictionary<KeyType, ObjectType> *)dict;
编辑： 做这样的事情
NSMutableDictionary *newDict = [NSMutableDictionary dictionaryWithDictionary:oldDict];
答案 2 :(得分：0)
尝试此操作以更改question_ans＆amp;的价值question_ans_comments
NSString *jsonString = @"{ \"data\": { \"My_Tool_Box\": { \"Visual Check\": [ { \"que_cat_id\": \"1\", \"question_id\": \"1\", \"question_name\": \"Power leads\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"1\", \"question_id\": \"2\", \"question_name\": \"Power\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"1\", \"question_id\": \"3\", \"question_name\": \"Rcd is operational\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"1\", \"question_id\": \"4\", \"question_name\": \"ase to avoid damage\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"1\", \"question_id\": \"5\", \"question_name\": \"Safety guards if fitted to machine ARE OPERATIONAL AND ARE NOT DAMAGED\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"1\", \"question_id\": \"6\", \"question_name\": \"ase to avoid damage\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"1\", \"question_id\": \"7\", \"question_name\": \"ase to avoid damage\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } } ], \"Operational checks\": [ { \"que_cat_id\": \"2\", \"question_id\": \"8\", \"question_name\": \"ase to avoid damage\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"2\", \"question_id\": \"9\", \"question_name\": \"ase to avoid damage\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } }, { \"que_cat_id\": \"2\", \"question_id\": \"10\", \"question_name\": \"ase to avoid damage\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } } ], \"Operating instructions\": [ { \"que_cat_id\": \"3\", \"question_id\": \"11\", \"question_name\": \"ase to avoid damage\", \"question_ans\": \"\", \"question_ans_comments\": \"\", \"question_options\": { \"1\": \"Yes\", \"2\": \"No\", \"3\": \"N/A\", \"4\": \"Comment\" } } ] } }, \"status\": \"success\", \"message\": \"Question Listing\" }";
NSData* data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *dic = [[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil] mutableCopy];
NSMutableDictionary *oldDic = [[[[dic objectForKey:@"data"] objectForKey:@"My_Tool_Box"] objectForKey:@"Visual Check"] objectAtIndex:0];
NSLog(@"oldDic :: %@",oldDic);
[oldDic setObject:@"iOS Dev Answer" forKey:@"question_ans"];
[oldDic setObject:@"iOS Dev Comments" forKey:@"question_ans_comments"];
NSLog(@"dic :: %@",dic);
答案 3 :(得分：0)
您从服务器获得的响应是静态的。因此它来自 NSDictionary 。您需要分配自己的 NSMutableDictionary ，并且已将所有值添加到其中。
NSMutableDictionary *dicYourData = [[NSMutableDictionary alloc] initWithDictionary:PASS_YOUR_RESPONSE_DIRECTORY];
现在您可以在任何地方使用 dicYourData 并使其可更新。