How to simplify my code... 2D NSArray in Objective C...?
self.myArray = [NSArray arrayWithObjects: [NSArray arrayWithObjects: [self generateMySecretObject], [self generateMySecretObject],nil], [NSArray arrayWithObjects: [self generateMySecretObject], [self generateMySecretObject],nil],nil];
for (int k=0; k<[self.myArray count]; k++) {
for(int s = 0; s<[[self.myArray objectAtIndex:k] count]; s++){
[[[self.myArray objectAtIndex:k] objectAtIndex:s] setAttribute:[self generateSecertAttribute]];
}
}
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As you can see this is a simple 2*2 array, but it takes me lots of code to assign the NSArray in very first place, because I found that the NSArray can't assign the size at very beginning. Also, I want to set attribute one by one. I can't think of if my array change to 10*10. How long it could be. So, I hope you guys can give me some suggestions on shorten the code, and more readable. thz
(Some Assumptions: myArray will have a fixed size. It won't grown up or become smaller in the run time.)
Generate the array by -addObject:
.
NSMutableArray* myArray = [NSMutableArray array];
for (int k = 0; k < 10; ++ k) {
NSMutableArray* subArr = [NSMutableArray array];
for (int s = 0; s < 10; ++ s) {
id item = (s == 0 && k == 0) ? [self d] : [self generateMySecretObject];
[item setAttribute:[self generateSecertAttribute]];
[subArr addObject:item];
}
[myArray addObject:subArr];
// use [myArray addObject:[[subArr copy] autorelease]] for deep immutability.
}
return [[myArray copy] autorelease];
(Don't query self.myArray
many times. Each corresponds to an ObjC call and while someone calls an ObjC call is cheap, it's still not free.)
If the array is a fixed size and each row is the same length then you could uses a 1D array and an offset, EG:
int rowLength = 5;
int rowNumber = 0;
int columnNumber = 3;
[myArray objectAtIndex: (rowLength * rowNumber) + columnNumber];
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