incompatible pointer types assigning to 'nsmutablearray ' from 'nsarray '

Question

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];

sortedFloats = [Arr_distance sortedArrayUsingDescriptors:
                    [NSMutableArray arrayWithObject:sortDescriptor]];

where sortedFloats is NSMutableArray and Arr_distance is also NSMutableArray

I got the warning Incompatible pointer types assigning to 'NSMutableArray ' from 'NSArray ' still result is correct, but whats the warning about?

Niru Mukund Shah · Accepted Answer · 2012-12-13 06:02:56Z

5

Take your sortedFloats as NSArray instead of NSMutableArray. You will find your warning disappeared.

Enjoy Programming

answered Dec 13, 2012 at 6:02

Niru Mukund Shah

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Comments

Midhun MP · Accepted Answer · 2012-12-13 17:26:47Z

2

There is two issues in that code:

Parameter type of sortedArrayUsingDescriptors is NSArray you are passing an NSMutableArray
Return type of sortedArrayUsingDescriptors is NSArray you are assigning it to NSMutableArray object

Check the method signature:

- (NSArray *)sortedArrayUsingDescriptors:(NSArray *)sortDescriptors

edited Dec 13, 2012 at 17:26

answered Dec 13, 2012 at 6:03

Midhun MP

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Comments

Midhun MP · Accepted Answer · 2012-12-13 06:00:43Z

0

In sortedArrayUsingDescriptors: you default object you should pass is NSArray.You are getting the warning as you are passing NSMutableArray.

According to the documentation:

- (NSArray *)sortedArrayUsingDescriptors:(NSArray *)sortDescriptors

edited Dec 13, 2012 at 6:00

Midhun MP

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answered Dec 13, 2012 at 5:59

Divya

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Paras Joshi · Accepted Answer · 2012-12-13 06:37:24Z

0

Here sortedFloats is object of NSMutableArray and also you sort the array using array key with sortedArrayUsingDescriptors method of NSMutableArray which return NSArray..

so here this sortedArrayUsingDescriptors method's returns type is NSArray and you store this return type array in object of NSMutableArray name is sortedFloats so take sortedFloats as a object of NSArray class. i hope this help you...

edited Dec 13, 2012 at 6:37

answered Dec 13, 2012 at 6:18

Paras Joshi

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