Problem removing multiple objects from NSMutableArray iPhone SDK

Question

I am having trouble removing objects from nsmutable array. Here it is.

NSURL *url = [NSURL URLWithString:@"http://www.lockerz.com/dailies"]];
NSData *datadata = [NSData dataWithContentsOfURL:url];  
NSString *removeForArray = [[NSString alloc] initWithData:datadata encoding:NSASCIIStringEncoding];
NSArray *theArray = [removeForArray componentsSeparatedByString:@" "];  
NSMutableArray *deArray = [[NSMutableArray array] initWithArray:theArray];
[deArray removeObjectsInRange:NSMakeRange(0, 40)];  
NSLog(@"%@", deArray);

It crashes on me and says the following: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSMutableArray initWithCapacity:]: method only defined for abstract class. Define -[__NSArrayM initWithCapacity:]!' *** Call stack at first throw: — Michael Amici
– Michael Amici, Commented Jul 18, 2010 at 19:00
Michael Amici: You seem to have confused alloc (which returns a blank object you own which you then need to initialize) with array (which returns an initialized empty array object you don't own). See Georg Fritzsche's answer for one solution. — Peter Hosey
– Peter Hosey, Commented Jul 18, 2010 at 20:38

Georg Fritzsche · Accepted Answer · 2010-07-19 01:14:52Z

3

+[NSMutableArray array] already returns an initialized array. Don't use an initializer method on that, they are used on new instances that you allocd.

In this case you can either

alloc/init an instance
use -mutableCopy
use a suitable convenience constructor

The three following lines are equivalent:

NSMutableArray *a = [[theArray mutableCopy] autorelease];
NSMutableArray *b = [NSMutableArray arrayWithArray:theArray];
NSMutableArray *c = [[[NSMutableArray alloc] initWithArray:theArray] autorelease];

edited Jul 19, 2010 at 1:14

answered Jul 18, 2010 at 19:26

Georg Fritzsche

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