ObjectiveC, creating array of classes

Question

I have a class that contains values:

@interface Params : NSObject {
  [...]
  NSString *fc;
  NSString *sp;
  NSString *x;
  NSString *y;
  [...]
  @property (nonatomic, assign) NSString *fc;
  @property (nonatomic, assign) NSString *sp;
  @property (nonatomic, assign) NSString *x;
  @property (nonatomic, assign) NSString *y;
  [...]
@end

it's possible to create in objective-c an array of classes? like c# / java?

MyClass[] a = new MyClass[20] ???
a[0].fc = "asd" ?

or something equivalent?

thanks, alberto

Dave DeLong · Accepted Answer · 2010-11-16 17:28:07Z

2

While the standard way to do this would be with an NSArray, you can do this with a C-style array as well:

int numObjects = 42;
Params ** params = malloc(sizeof(Param*) * numObjects);
for (int i = 0; i < numObjects; ++i) {
  params[i] = [[[Params alloc] init] autorelease];
}

free(params);

However, using an NSArray would be much simpler. :)

answered Nov 16, 2010 at 17:28

Dave DeLong

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1 Comment

Luke Mcneice Over a year ago

I would prefer a recursive autoreleased method myself

Luke Mcneice · Accepted Answer · 2010-11-16 17:55:58Z

2

You would use a standard NSArray to do this, in my example I have used views, but you can use pointers to any object.

    UIView * object = [[UIView alloc] init];
 UIView * object2 = [[UIView alloc] init];
 UIView * object3 = [[UIView alloc] init];

 NSArray * array = [[NSArray alloc] initWithObjects:object,object2,object3,nil];

[object release];[object2 release];[object3 release];//edit

 UIView * test = [array objectAtIndex:0];
 test.tag = 1337;

edited Nov 16, 2010 at 17:55

answered Nov 16, 2010 at 14:29

Luke Mcneice

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2 Comments

Vladimir Over a year ago

do not forget to release your view objects - your code leaks memory

Ben Gotow Over a year ago

Also note that if you want to create something equivalent to an ArrayList, you want to use the mutable (aka modifiable) version of NSArray, it's subclass NSMutableArray

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