我是iOS新手，当我实现从api获取数据时，我收到-[__NSCFDictionary objectAtIndex:]:错误。
-(void)JobTakeFive{
[MBProgressHUD showHUDAddedTo:self.view animated:YES];
//NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://www.json-generator.com/api/json/get/cuCmzXKUOa?indent=2"]]];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://www.json-generator.com/api/json/get/cpvIEMqesy?indent=2"]]];
NSLog(@"%@",request);
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if (conn)
{
responseData = [[NSMutableData alloc] init];
}else{
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[responseData setLength:0];
postresponce = [[NSMutableData alloc] init];
[postresponce setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
[postresponce appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
NSLog(@"%@ ", [error localizedDescription]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError *error=nil;
NSDictionary *responCE =[NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
respArray=[responCE valueForKey:@"yes_questions"];
respArray1=[responCE valueForKey:@"no_questions"];
[MBProgressHUD hideHUDForView:self.view animated:YES];
[take5table reloadData];
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
switch (section) {
case 0:
return respArray.count;
break;
case 1:
return respArray1.count;
break;
default:
return 0;
}
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
NSLog(@"Section:%ld Row:%ld selected and its data is %@",
(long)indexPath.section,(long)indexPath.row,cell.textLabel.text);
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
if (section == 0) return @"First section header title";
if (section == 1) return @"Second section header title";
else
return @"Hello World";
}
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"CellIdentifier1";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
UILabel *Sno = (UILabel *)[cell viewWithTag:96];
UILabel *QuesLab = (UILabel *)[cell viewWithTag:98];
if (indexPath.section==0) {
// titleUIL.text = [[dicc valueForKey:[headersArray objectAtIndex:indexPath.section]]objectAtIndex:indexPath.row];
Sno.text=[NSString stringWithFormat:@"%@",[[respArray objectAtIndex:indexPath.row] valueForKey:@"question_id"]];
QuesLab.text=[[respArray objectAtIndex:indexPath.row]valueForKey:@"question_title"];
}
else if (indexPath.section==1){
Sno.text=[NSString stringWithFormat:@"%@",[[respArray1 objectAtIndex:indexPath.row] valueForKey:@"question_id"]];
QuesLab.text=[[respArray1 objectAtIndex:indexPath.row]valueForKey:@"question_title"];
}
if (indexPath.row %2 ==1)
cell.backgroundColor = [UIColor colorWithRed:.9 green:.9 blue:.9 alpha:1];
else
cell.backgroundColor = [UIColor colorWithRed:.8 green:.8 blue:.8 alpha:1];
return cell;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 50;
}
-[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x7f90d3eaf8a0
2016-11-08 10:44:16.935 Ecs Services[3691:701820] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x7f90d3eaf8a0'
我的回答是：
Printing description of responCE:
{
"job_location" = "Crown Promenade ";
"job_name" = "Test Schedule 2 for Crown Promenade";
"job_no" = 207;
"no_questions" = {
12 = {
"question_answer" = No;
"question_id" = 13;
"question_title" = "Is there a risk of falls or falling objects?";
"question_type" = Full;
};
13 = {
"question_answer" = No;
"question_id" = 14;
"question_title" = "Is there a risk of Plant or Traffic interaction?";
"question_type" = Full;
};
14 = {
"question_answer" = No;
"question_id" = 15;
"question_title" = " Is there a risk of electrical hazards?";
"question_type" = Full;
};
15 = {
"question_answer" = No;
"question_id" = 16;
"question_title" = " Is the work in or involve a confined space? ";
"question_type" = Full;
};
16 = {
"question_answer" = No;
"question_id" = 19;
"question_title" = " Does the job involve hot works?";
"question_type" = Short;
};
17 = {
"question_answer" = No;
"question_id" = 20;
"question_title" = "Is there a risk of environmental damage? ";
"question_type" = Full;
};
18 = {
"question_answer" = No;
"question_id" = 21;
"question_title" = " Is there a risk of crush injuries? (in,on or between)";
"question_type" = Full;
};
19 = {
"question_answer" = No;
"question_id" = 22;
"question_title" = "Is there a risk of water or sun hazards?";
"question_type" = Full;
};
20 = {
"question_answer" = No;
"question_id" = 23;
"question_title" = "Are there any access issues or concerns ";
"question_type" = Full;
};
21 = {
"question_answer" = No;
"question_id" = 24;
"question_title" = " Are there hazards involving unstable ground?";
"question_type" = Full;
};
22 = {
"question_answer" = No;
"question_id" = 25;
"question_title" = " Do I need to apply isolation ?.................... ";
"question_type" = Short;
};
23 = {
"question_answer" = No;
"question_id" = 26;
"question_title" = "Could there be any uncontrolled movement? \U2026...\U2026\U2026.\U2026.. ";
"question_type" = Full;
};
24 = {
"question_answer" = No;
"question_id" = 27;
"question_title" = "Do I need mechanical lifting or a work at height platform? .. ";
"question_type" = Full;
};
25 = {
"question_answer" = No;
"question_id" = 39;
"question_title" = test;
"question_type" = Full;
};
};
"yes_questions" = {
0 = {
"question_answer" = Yes;
"question_id" = 1;
"question_title" = " Do I understand the job thoroughly?";
"question_type" = Full;
};
1 = {
"question_answer" = Yes;
"question_id" = 2;
"question_title" = "Am I authorized, qualified & trained to do the work?";
"question_type" = Short;
};
10 = {
"question_answer" = Yes;
"question_id" = 11;
"question_title" = "Do I have the appropriate PPE & in good condition?";
"question_type" = Full;
};
11 = {
"question_answer" = Yes;
"question_id" = 12;
"question_title" = "Can I complete the task on my own ? ";
"question_type" = Full;
};
2 = {
"question_answer" = Yes;
"question_id" = 3;
"question_title" = "Do I have the correct tools & they\U2019re in good condition?";
"question_type" = Full;
};
26 = {
"question_answer" = Yes;
"question_id" = 40;
"question_title" = "";
"question_type" = Full;
};
27 = {
"question_answer" = Yes;
"question_id" = 41;
"question_title" = "equipment in good condition";
"question_type" = Full;
};
3 = {
"question_answer" = Yes;
"question_id" = 4;
"question_title" = "Have I informed others who may be affected by my work? ";
"question_type" = Full;
};
4 = {
"question_answer" = Yes;
"question_id" = 5;
"question_title" = "Is there free access to others not involved in the vicinity?";
"question_type" = Full;
};
5 = {
"question_answer" = Yes;
"question_id" = 6;
"question_title" = " I have read & understand the SWMS applicable to this task? ";
"question_type" = Full;
};
6 = {
"question_answer" = Yes;
"question_id" = 7;
"question_title" = "Have I obtained all permits & filled out correct paperwork? ";
"question_type" = Short;
};
7 = {
"question_answer" = Yes;
"question_id" = 8;
"question_title" = "Have I applied lock out tags (where & if required)? ";
"question_type" = Full;
};
8 = {
"question_answer" = Yes;
"question_id" = 9;
"question_title" = " Have I performed a pre job on-site inspection?";
"question_type" = Full;
};
9 = {
"question_answer" = Yes;
"question_id" = 10;
"question_title" = " Am I fit for this task? (fatigue, injury, medications)";
"question_type" = Full;
};
};
}
答案 0 :(得分：0)
问题是，您的响应正在返回字典，而不是您期望的数组。要解决这个问题，您可以使用NSDictionary的allValues方法，该方法返回字典中所有值的数组。
要解决此问题，请进行以下更正：
在您的回复解析中：
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError *error=nil;
NSDictionary *responCE =[NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
respArray=[[responCE valueForKey:@"yes_questions"] allValues]; //Now you have array of dictionaries which were contained in the dictionary with key yes_question
respArray1=[[responCE valueForKey:@"no_questions"] allValues];//Now you have array of dictionaries which were contained in the dictionary with key no_question
[MBProgressHUD hideHUDForView:self.view animated:YES];
[take5table reloadData];
}