Simulator crashes "[NSMutableArray insertObject:atIndex:]: attempt to insert nil object at 0' "

Question

I am working on an application that will utilize a custom image picker and try as I might, I can not seem to get the application to run quite right. Xcode debugger flags the following "Thread 1: Program recieved signal: "SIGABRT"."

  - (id) init { 
    if ((self = [super init])) {
        _images =  [[NSMutableArray alloc] init];
        _thumbs =  [[NSMutableArray alloc] init];
    }
    return self;
}

- (void)addImage:(UIImage *)image {
    [_images addObject:image];
    [_thumbs addObject:[image imageByScalingAndCroppingForSize:CGSizeMake(64, 64)]];
}

This is in xcode 4 on the new debugger. Thanks in advance.

read the exception again. Either image or [image imageByScalingAndCroppingForSize:] is nil. Most likely your image scaling method doesn't work correctly. — Matthias Bauch
– Matthias Bauch, Commented May 2, 2011 at 0:19
Where is imageByScalingAndCroppingForSize defined? If it's returning nil, you'll get that error. As you will if image is nil. — Terry Wilcox
– Terry Wilcox, Commented May 2, 2011 at 0:19

Alan Zeino · Accepted Answer · 2011-05-02 00:28:48Z

5

One of those objects is nil. The following code will help you discover which one:

- (void)addImage:(UIImage *)image 
{
    if (image)
    {
        [_images addObject:image];
    }
    else
    {
        NSLog(@"image is nil");
    }

    UIImage *newImage = [image imageByScalingAndCroppingForSize:CGSizeMake(64, 64)];
    if (newImage)
    {
        [_thumbs addObject:newImage];
    }
    else
    {
        NSLog(@"newImage is nil");
    }
}

answered May 2, 2011 at 0:28

Alan Zeino

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