Menu
I am making the switch from Java to Objective-c, and I'm having some difficulty. I have searched this problem this without much success.
I have an NSMutableArray that stores NSMutableArrays. How do I add an array to the array?
467
In Objective-C, the compiler generates code that makes an underlying call to the init(objects:count:) method. id objects[] = { someObject, @"Hello, World!", @42 }; NSUInteger count = sizeof(objects) / sizeof(id); NSArray *array = [NSArray arrayWithObjects:objects count:count];
The primary difference between NSArray and NSMutableArray is that a mutable array can be changed/modified after it has been allocated and initialized, whereas an immutable array, NSArray , cannot.
The NSMutableArray class declares the programmatic interface to objects that manage a modifiable array of objects. This class adds insertion and deletion operations to the basic array-handling behavior inherited from NSArray . NSMutableArray is “toll-free bridged” with its Core Foundation counterpart, CFMutableArray .
In general, the collection classes (for example, NSMutableArray , NSMutableDictionary ) are not thread-safe when mutations are concerned. That is, if one or more threads are changing the same array, problems can occur.
You can either store a reference to another array (or any type of object) in your array:
[myArray addObject:otherArray]; Or concatenate the arrays.
[myArray addObjectsFromArray:otherArray]; Both of which are documented in the documentation.
118
Since an array is just an object like any other:
[myContainerMutableArray addObject:someOtherArray]; Or if you want to concatenate them:
[myFirstMutableArray addObjectsFromArray:otherArray]; If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
