CODEWITHSUNDEEP
iosobjective-cios7nsstring
AvSalute
AvSalute

Reputation: 33

Better way to convert int to string in iOS

I am wondering if there is a better way to convert int to string Basically I have a counter and a dictionary

//
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
int cnt = 0;
//
// insert an object
//
id object = [[[SomeObject alloc] init] autorelease];
NSString *key = [NSString stringWithFormat:@"%d", cnt++];
[dict setObject:object forKey:key];

The thing is converting int to string takes more time than I expected. So is there a better way to get around this?

Upvotes: 1

Views: 1140

Answers (3)

gaussblurinc
gaussblurinc

Reputation: 3682

Interesting link about nsfoundation

Quote:

NSString creation is not particularly expensive, but when used in a tight loop (as dictionary keys, for example), +[NSString stringWithFormat:] performance can be improved dramatically by being replaced with asprintf or similar functions in C.

and code example:

NSString *firstName = @"Daniel";
NSString *lastName = @"Amitay";
char *buffer;
asprintf(&buffer, "Full name: %s %s", [firstName UTF8String], [lastName UTF8String]);
NSString *fullName = [NSString stringWithCString:buffer encoding:NSUTF8StringEncoding];
free(buffer);

Upvotes: 1

MobA11y
MobA11y

Reputation: 18860

I suppose this is mildly faster:

NSString* yourString = [@(yourInteger) stringValue];

And this

[dict setObject:yourObj forKey:[@(yourInt) stringValue]];

Does look better than:

[dict setObject:yourObj forKey:[NSString stringWithFormat:@"%d",yourInt]];

But we're really splitting hairs here from both speed and style points of view.

Upvotes: 6

hris.to
hris.to

Reputation: 6363

Do you explicity need it as a string? Or maybe just use literals(note that it will be NSNumber in this case):

[dict setObject:object forKey:@(cnt++)];

Upvotes: 0

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