为什么应用程序在iPhone模拟器中崩溃？ 我怎样才能解决这个问题？

Question

I'm working on an app that uses a navigation controller. When I build, I get no errors or warnings. I've defined a method myMethod in FirstViewController.m file, then in viewDidLoad I call the method with [self myMethod]; .

When I built and ran from the Console, I got nothing. So I put NSLog() statements like so:

-(void) viewDidLoad {
NSLog(@"Entering viewDidLoad");
[self myMethod];
NSLog(@"Called myMethod");
[super viewDidLoad];
}

The Console never returns the second NSLog statement, leading me to believe that the app crashes while calling the method.

I've tried this with the simulator set to iOS 4.0.1 as well as iOS 4.1. I'm building against the iOS 4.1 SDK. I really appreciate any help you can offer.

Update: I ran the Debugger, which seems to show the problem being in myMethod . I only make it through a few lines of code in that method before I receive "EXC_BAD_ACCESS". The lines of code are:

-(void)myMethod {
NSMutableArray *someStuff;
NSMutableArray *someMoreStuff;

stuffSections=[[NSMutableArray alloc] initWithObjects:@"Some Stuff",@"Some More Stuff",nil];

someStuff=[[NSMutableArray alloc] init];
someMoreStuff=[[NSMutableArray alloc] init];

[someStuff addObject:[[NSMutableDictionary alloc]initWithObjectsAndKeys:@"Item Name",@"name",@"Item Picture.png",@"picture",@"http://theurl.net/",@"url",@"1",@"itemCode",nil]];

But it appears that I can't get past this first attempt to add something to the someStuff array.

Answer 1

Have you cross checked the two MutableArrays? Do they have been allocated successfully? You get " EXC_BAD_ACCESS " when the app got into a corrupted state that is usually due to a memory management issue. I guess the arrays are not allocated.

Try allocating this way.

NSMutableArray * someStuff = [[NSMutableArray alloc]initWithCapacity:3];
NSMutableArray * someMoreStuff = [[NSMutableArray alloc]initWithCapacity:3];

add a breakpoint there are check in the debug area and confirm whether they are being allocated successfully. If there is a memory to each of these array, then they are allocated.

Answer 2

Looks like there is a problem in "myMethod". If I had to guess, I would say you are trying to reference an object that was auto-released and not retained.

Answer 3

You're missing the alloc when initializing someStuff and someMoreStuff. It should be

   someStuff = [[NSMutableArray alloc] init];
   someMoreStuff = [[NSMutableArray alloc] init];