Mutable array of mutable arrays with modern syntax

Question

How can I write the following code:

self.box = [[NSMutableArray alloc] initWithObjects:
                    [NSMutableArray arrayWithObjects:_imageView1,_imageView2,_imageView3,nil],
                    [NSMutableArray arrayWithObjects:_imageView4,_imageView5,_imageView6,nil],
                    [NSMutableArray arrayWithObjects:_imageView7,_imageView8,_imageView9,nil],
                    nil];

with the modern syntax?

Do you really need mutable arrays? It's quite unlikely for UI elements. — vadian
– vadian, Commented Nov 8, 2017 at 16:39

joan · Accepted Answer · 2017-11-08 16:39:10Z

4

I will self answer: for NSMutableArray there is no literal syntax, so you have to write:

  self.box = [@[
    [@[ _imageView1, _imageView2, _imageView3 ] mutableCopy],
     [@[ _imageView4, _imageView5, _imageView6 ] mutableCopy],
     [@[ _imageView7, _imageView8, _imageView9 ] mutableCopy]
    ] mutableCopy];

answered Nov 8, 2017 at 16:39

joan

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CRD · Accepted Answer · 2017-11-08 21:14:18Z

1

If you wish to do it with fewer brackets than your own answer you can use:

self.box = @[
             @[_imageView1, _imageView2, _imageView3].mutableCopy,
             @[_imageView4, _imageView5, _imageView6].mutableCopy,
             @[_imageView7, _imageView8, _imageView9].mutableCopy
           ].mutableCopy;

answered Nov 8, 2017 at 21:14

CRD

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2 Comments

Maarten Foukhar Over a year ago

I wouldn't use dot notation here since mutableCopy is a normal method and not a property: - (id)mutableCopy; Although it is shorter it can lead to confusing code like: 'someObject.someReallyExpensiveMethod' and 'NSMutableArray.alloc.init.count'.

CRD Over a year ago

@MaartenFoukhar - I almost wrote in the answer that some might not like this as mutableCopy is declared as a method with a property getter-like type, but decided not to - didn't want to upset sensitive Swiftees ;-) Joking aside I think they key word is like, and yes it can be abused if taken to extreme but this case doesn't. (I'll admit I often write .new as well, but never .alloc.init!)

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