CODEWITHSUNDEEP
iphoneobjective-cplistnsdictionary
Staeff
Staeff

Reputation: 5084

SIGABRT when using NSDictionary setObject: forKey:

I'm using a property-file with this structure:

maxRating     Number    --> 5
gradePercent  Dictonary
>grade1       Number    --> 0.85
>grade2       Number    --> 0.70
>grade3       Number    --> 0.55
>grade4       Number    --> 0.40

To read the properties I'm using

NSDictionary *plist = [[NSDictionary alloc] initWithContentsOfFile:filepath];

rating = [[plist objectForKey:@"maxRating"] intValue];
gradePercent = (NSMutableDictionary*)[[plist objectForKey:@"gradePercent"] copy];

Till here every thing works perfectly...I can get the right objects with [gradePercent objectForKey:@"grade1"]

but when I try to set one of them with

[gradePercent setObject:[NSNumber numberWithFloat:0.90] forKey:@"grade1"]

I always get a SIGABRT error and the APP is crashing.

Does anyone see why this isn't working? Because I don't -.-

Upvotes: 0

Views: 2506

Answers (4)

Jilouc
Jilouc

Reputation: 12714

[[plist objectForKey:@"gradePercent"] copy] returns an immutable dictionary.

What you need is [[plist objectForKey:@"gradePercent"] mutableCopy]

Upvotes: 4

Kirby Todd
Kirby Todd

Reputation: 11556

NSDictionary does not have a setObject: forKey: method

Upvotes: 1

mmmmmm
mmmmmm

Reputation: 32681

Because the dictionary you have is read only to get a Mutable dictionary from any dictionary you need to call addEntriesFromDictionary on a Muntable dictionary

e.g.

NSMutableDictionary* dict = [NSMutableDictionary dictionary];
[dict addEntriesFromDictionary:[plist objectForKey:@"gradePercent"]];

the [plist objectForKey:@"gradePercent"] is a NSDictionary and so cannot be added to. You cannot simply cast from NSDictionary* to NSMutableDictionary *.

Upvotes: 1

DarkDust
DarkDust

Reputation: 92335

An NSDictionary is immutable, and simply casting the pointer to NSMutableDictionary * doesn't make the object magically become mutable. So you need a mutable dictionary. You could do it like this:

NSMutableDictionary *plist = [[NSMutableDictionary alloc] initWithContentsOfFile:filepath];

Upvotes: 4

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