Objective-C select part of array - ios

Question

I am quite new to xcode / objective-c and I am facing a problem for a while now.
In my application I have a Json array receiving from my server, I send the array to the secondViewController by segue. This all goes right.
In my secondViewController I receive the array and select the part I needed by;
self.excersiseSection = [self.schemeData objectForKey:#"user_excersise_sections"];
This outputs the part of the array I've pushed to this controller so that's allright. Now, I want
to select the nested 'exercises' array (to print my table cells) in this array I have tried to do it like the code above with the index 'exercises' but no success.
{
"user_training_days": [
{
"day_id": 1,
"day_name": "Monday",
"training": "trainingsdag",
"user_excersise_sections": [
{
"section_title": "Legs",
"exercises": [
{
"exercise_title": "Leg press",
"excercise_sets": "4",
"excercise_reps": "12",
}
]
},...etc

Answer 1

Here is a sample code that will iterate over your json, and simple print it out
for (NSDictionary *section in excersiseSection) {
NSLog(#"--- section_title: %#", section[#"section_title"]);
for (NSDictionary *excercise in section[#"exercises"]) {
NSLog(#"----- exercise_title: %#", excercise[#"exercise_title"]);
NSLog(#"----- excercise_sets: %#", excercise[#"excercise_sets"]);
NSLog(#"----- excercise_reps: %#", excercise[#"excercise_reps"]);
}
}
This should help you, to construct your tableview.
EDIT:
Here is a complete solution to render your tableView.
1) Create a TableViewController in strotybaord, and assign a Custom class in storyboard.
2) Paste below code in the class
3) You are ready to go! :)
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return self.excersiseSection.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.excersiseSection[section][#"exercises"] count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return self.excersiseSection[section][#"section_title"];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:#"Cell"];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
}
NSDictionary *excercise = self.excersiseSection[indexPath.section][#"exercises"][indexPath.row];
cell.textLabel.text = excercise[#"title"];
cell.detailTextLabel.text = [NSString stringWithFormat:#"Sets: %#, Reps: %#",
excercise[#"excercise_sets"], excercise[#"excercise_reps"]];
return cell;
}

Answer 2

I don't know how your data model is structured, but couldn't you try something like the following:
self.excersiseSection = [[[self.schemeData objectForKey:#"user_excersise_sections"] objectAtIndex:0] objectForKey:#"exercises"];
Just chain the calls together. Note that this won't work if user_excersise_sections and exercises are not NSArray objects.

Answer 3

I'd suggest creating particular classes like UserTrainingDay, UserExcersiseSection and Excercise and use for example Mantle framework to establish mapping between your JSON and model classes.