Crash on iOS5 -[__NSArrayM objectAtIndexedSubscript:]: unrecognized selector sent to instance

[vkodocha]

Looks like the lib has an issue with the array subscript syntax used inside the NSArray+UISS category code. When you use this on iOS 5 it will crash with the following exception: -[__NSArrayM objectAtIndexedSubscript:]: unrecognized selector sent to instance

From my research it look like that the back warts support for array subscription does not work from within a category.

I'm not sure if this lib is still supporting / or should be still supporting iOS 5 but from the pod file found in the example I expect that it does at the moment. So it would perhaps make sense to fix the code.

@implementation NSArray (UISS)

- (BOOL)canConvertToIntObjectAtIndex:(NSUInteger)index {
    return self.count > index && [[self objectAtIndex:index] respondsToSelector:@selector(intValue)];
}

- (BOOL)canConvertToFloatObjectAtIndex:(NSUInteger)index {
    return self.count > index && [[self objectAtIndex:index] respondsToSelector:@selector(floatValue)];
}

@end

[robertwijas]

Which SDK are you compiling your code with?

[vkodocha]

Hi I'm compiling with the 6.1 SDK, and the deployment target set to iOS 5.1.

When I was looking into this issue I found one comment on StackOverflow about how Apple creates the backwards support of the new syntax for iOS 5 by creating a special category on the NSArray class. I'm assuming that this is was causing the issue.

[robertwijas]

I cannot reproduce this crash. AFAIK if you compile with SDK >= 6.0 everything should work just fine.