Passing NSComboBox value that is inside a NSAlert Sheet - objective-c

Question

I have a NSAlert Sheet that has a NSComboBox inside. How can i pass the combo box value when the user has pressed a button of the NSAlert?
code:
NSComboBox* comboBox = [[NSComboBox alloc] initWithFrame:NSMakeRect(0, 0, 150, 26)];
[comboBox setTitleWithMnemonic:#"2"];
for (int i=2; i<[array count]+1; i++){
[comboBox addItemWithObjectValue:[NSString stringWithFormat:#"%i", i]];
}
[comboBox setEditable:NO];
NSAlert *alert = [[NSAlert alloc] init];
[alert addButtonWithTitle:#"Okay"];
[alert addButtonWithTitle:#"Cancel"];
[alert setMessageText:#"Choose a number"];
[alert setAccessoryView:comboBox];
[alert beginSheetModalForWindow:_window modalDelegate:self didEndSelector:#selector(alertToChooseX:returnCode:contextInfo:) contextInfo:nil];
- (void)alertToChooseX:(NSAlert *)alert returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo {
if (returnCode == NSAlertFirstButtonReturn) {
NSLog(#"Pressed Okay");
}
}

Answer 1

Describe comboBox in Your header file and after pushed button "Okay" take it's value like this:
in .h
NSComboBox *comboBox;
in .m
comboBox = [[NSComboBox alloc] initWithFrame:NSMakeRect(0, 0, 150, 26)];
[comboBox setTitleWithMnemonic:#"2"];
.... // Your all code goes here
- (void)alertToChooseX:(NSAlert *)alert returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo {
if (returnCode == NSAlertFirstButtonReturn) {
NSLog(#"Pressed Okay");
NSLog(#"Selected ComboBox's String Value: %#", [comboBox stringValue]);
NSLog(#"Selected ComboBox's Object Value: %#", [comboBox objectValueOfSelectedItem]);
NSLog(#"Selected ComboBox's Item Index: %ld", [comboBox indexOfSelectedItem]);
}
}
Note: Don't forget to release comboBox because it's allocating memory.