Null data when loading DetailView - objective-c

Question

I have UITableView I want to click on row and load detail view but I have null information in my Log in detail view
would you please help m win this implementation
Thanks in advance!
cellForRowAtIndexPath method:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath
{
//Load Cell for reuse
static NSString *CellIdentifier = #"TestCell";
TestCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell =[ [[NSBundle mainBundle] loadNibNamed:#"TestCell" owner:nil options:nil]
lastObject];
}
_tests = [server info];
_t = [NSMutableString stringWithFormat:#"%# ", [_tests objectAtIndex:indexPath.row]];
NSString *testdata = _t;
_components = [testdata componentsSeparatedByString:#","];
for (NSString *aComponent in _components) {
if ([aComponent hasPrefix:#"titletest"]) {
_subComponents = [aComponent componentsSeparatedByString:#":"];
_testString = [_subComponents[1] stringByTrimmingCharactersInSet:[NSCharacterSet
characterSetWithCharactersInString:#"\""]];
}if ([aComponent hasPrefix:#"note"]){
_subComponents = [aComponent componentsSeparatedByString:#":"];
_noteString = [_subComponents[1] stringByTrimmingCharactersInSet:[NSCharacterSet
characterSetWithCharactersInString:#"\""]];
break;
}
}
cell.title.text = _testString;
cell.note.text = _noteString;
return cell;
}
didSelectRowAtIndexPath method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath
*)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
TestDetailView *c = [[TestDetailView alloc] init];
///I don't know what should I put here to c
[self.navigationController pushViewController:c animated:YES];
}
but in My detail view
- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:YES];
NSLog(#" test : %#",_Info.datas); ==>> my log was (null)
}
My Detail View Header
#property (strong, nonatomic) IBOutlet UILabel *bDetailTitle;
#property (strong, nonatomic) IBOutlet UILabel *bDetailNote;
#property (nonatomic, strong) NSArray *datas;
#property (nonatomic,strong) TestTable *Info;
#end

Answer 1

I'm assuming that TestDetailView is a ViewController subclass and that you have a property on it possibly called datas. If that is the case you appear to create your detail view controller in didSelectRowAtIndexPath: like this:
TestDetailView *c = [[TestDetailView alloc] init];
But then immediately change it the pointer to something else (possibly nil):
c = [_datas objectAtIndex:indexPath.row];
objectAtIndex returns an id which means your code probably doesn't throw a warning in Xcode, but at run time if [_datas objectAtIndex:indexPath.row] does not return a UIViewController (and I suspect that it does not) your app could crash. If it is not throwing an error or crashing you possibly have another problem in that _datas is nil in your parent view controller.
It is a very common technique to pass values to view controllers I would recommend reading up on how to do this. This type of question has been asked on S.O. many times:
How to set value for NSString in another view controller from one viewcontroller