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Editorial Team
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Asked: 2026-05-23T20:10:19+00:00

I am having trouble with compatibility between NSArray and NSMutableArray? –> Incompatible Objective-C types

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I am having trouble with compatibility between NSArray and NSMutableArray?
–> Incompatible Objective-C types assigning “struct NSArray *”, expected “struct NSMutableArray”

NSMutableArray *nsmarrRow;

NSString *nsstrFilePath = [[NSBundle mainBundle] pathForResource: nsstrFilename ofType: nsstrExtension];
NSString *nsstrFileContents = [NSString stringWithContentsOfFile: nsstrFilePath encoding:NSUTF8StringEncoding error: NULL];

//break up file into rows
nsmarrRow = [nsstrFileContents componentsSeparatedByString: nsstrRowParse];//<--Incompatible Objective-C types assigning "struct NSArray *", expected "struct NSMutableArray"

I have tried making the “NSString declaration” to “NSMutableString”… made more problems.

thanks

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1 Answer

  1. Editorial Team

    You can’t get a mutable array by doing 

    nsmarrRow = [nsstrFileContents componentsSeparatedByString: nsstrRowParse];

    You will need to,

    nsmarrRow = [NSMutableArray arrayWithArray:[nsstrFileContents componentsSeparatedByString: nsstrRowParse]];

    Changing NSString to NSMutableString won’t give you an NSMutableArray object. You will get an NSArray object just as in case of NSString. You will have to use that to get an NSMutableArray using the above method.

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