[iOS]application crash - ios

Question

in my Mac iPhone simulator (iPhone simulator 4.0) i run my app without problem, but when i change it to another Mac which runs iPhone simulator 4.2 it crushes on a button click somewhere in the app, could the version of the debugger (4.0 and 4.2) be the cause of a potential crash ? thx in advance :))
EDIT
this is the code i have doubt it may cause crash 'cause i use in it a UIPickerView code :
- (void)viewDidLoad {
((UILabel *)[[[[[[switchCommerce subviews] lastObject] subviews] objectAtIndex:2] subviews] objectAtIndex:0]).text = #"oui";
((UILabel *)[[[[[[switchCommerce subviews] lastObject] subviews] objectAtIndex:2] subviews] objectAtIndex:1]).text = #"non";
((UILabel *)[[[[[[switchStationDeLavage subviews] lastObject] subviews] objectAtIndex:2] subviews] objectAtIndex:0]).text = #"oui";
((UILabel *)[[[[[[switchStationDeLavage subviews] lastObject] subviews] objectAtIndex:2] subviews] objectAtIndex:1]).text = #"non";
[rayonDeRechercheSlider setValue:35 animated:YES];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
CGAffineTransform transform=CGAffineTransformMakeTranslation(0,480);
pickerViewTypeCarburant.transform=transform;
pickerViewNomStation.transform=transform;
[UIView commitAnimations];
[super viewDidLoad];
typeCarburantTextField.delegate=self;
nomDeStationTextField.delegate=self;
pickerArrayTypeCarburant=[[NSMutableArray alloc] initWithObjects:#"Sans Plomb 95",#"Gazole",#"Super Gazole",#"GNV",#"Sans Plomb 98",#"SP95-E10",#"E85",nil];
pickerArrayNomStation=[[NSMutableArray alloc] initWithObjects:#"TOTAL",#"SHELL",#"ESSO",#"CARREFOUR",#"BP",#"AGIP",#"CASINO",#"LECLERC",#"AUCHAN",#"ELF",#"AVIA",#"SUPER U",nil];//added
}

Answer 1

One potential problem in your code is that you appear to be assigning to your mutable array properties (pickerArrayTypeCarburant & pickerArrayNomStation) without using the self. notation. What this means is that the arrays are being assigned without using retain semantics (presuming that your #property declaration for the arrays is told to use retain).
The effect of this is that when you try to access this array later in your code you will find that the array has not been retained, and you will likely be receiving some kind of memory warning. Try this instead:
self.pickerArrayTypeCarburant=[[NSMutableArray alloc] initWithObjects:#"Sans Plomb 95",#"Gazole",#"Super Gazole",#"GNV",#"Sans Plomb 98",#"SP95-E10",#"E85",nil];
self.pickerArrayNomStation=[[NSMutableArray alloc] initWithObjects:#"TOTAL",#"SHELL",#"ESSO",#"CARREFOUR",#"BP",#"AGIP",#"CASINO",#"LECLERC",#"AUCHAN",#"ELF",#"AVIA",#"SUPER U",nil];
It's hard to tell if that will solve your problem since I don't know what error is being thrown, however if it is memory related then that could be the culprit.
To be sure, you could run your app in Instruments and see if there are any leaks or allocations where there shouldn't be.
EDIT:
In response to your comment regarding properties, your header file should probably declare your NSMutableArrays like this:
YourClass.h
#interface YourClass {
NSMutableArray *pickerArrayTypeCarburant;
NSMutableArray *pickerArrayNomStation;
}
#property (nonatomic, retain) NSMutableArray *pickerArrayTypeCarburant;
#property (nonatomic, retain) NSMutableArray *pickerArrayNomStation;
// Any method names here...
#end
And at the top of your .m file, just underneath the #implementation line:
#synthesize pickerArrayTypeCarburant, pickerArrayNomStation;
The #synthesize part will automatically create the required accessors and mutators for your properties, based on the information you provide on the lines with #property. In this case, I have defined that the properties should use retain semantics, which means that when you assign a value to your property using self. (i.e. self.pickerArrayNomStation = anArray;) the array you assign to it will automatically be retained by your property. Make sure you include the self. when assigning to a property that uses retain, as this is what tells it to use the generated mutator method, rather than just assigning to the instance variable without retaining.
By the way, make sure that when you generate retained properties in this way that you call [myProperty release]; in the dealloc method, and (assuming your class is a view controller...) self.myProperty = nil in your viewDidUnload method. This ensures that any retained objects are released properly when your views and view controllers are no longer needed.
If you need further information about this stuff, Apple's documentation is your friend. I found their programming guides really helpful when I was starting out. The guide I linked you in my comment under your answer is a good one to start with.
Hope this helps.
EDIT 2
Not sure if this will help, but I have sometimes found that assigning arrays in this way is a little safer... at the bottom of the ViewDidLoad method where you are assigning to your array property, change the code to this:
NSMutableArray *newArrayTypeCarburant = [[NSMutableArray alloc] initWithObjects:#"Sans Plomb 95",#"Gazole",#"Super Gazole",#"GNV",#"Sans Plomb 98",#"SP95-E10",#"E85",nil];
NSMutableArray *newArrayNomStation = [[NSMutableArray alloc] initWithObjects:#"TOTAL",#"SHELL",#"ESSO",#"CARREFOUR",#"BP",#"AGIP",#"CASINO",#"LECLERC",#"AUCHAN",#"ELF",#"AVIA",#"SUPER U",nil];
self.pickerArrayTypeCarburant = newArrayTypeCarburant;
self.pickerArrayNomStation = newArrayNomStation;
[newArrayTypeCarburant release];
[newArrayNomStation release];