NSString retain count in Objective-C

Question

NSString* nsString=[[NSString alloc]initWithString:@"nsString"];
NSLog(@"nsString RetainCount:%li",[nsString retainCount]);

the corresponding result is:

 2013-03-04 11:18:03.291 ARC[655:303] nsString RetainCount:-1

in addition: if use init a NSMutableString instance; it return 1;

so what is your question? – Breakpoint Mar 04 '13 at 03:25 — Breakpoint, Mar 04 '13 at 03:25

score 2 · Accepted Answer · edited Mar 04 '13 at 17:02

2

http://whentouseretaincount.com

Immutable NSStrings generated at compile time are singletons. Thus, they don't do the retain/release dance at all.

NSString detects when it is initialized with such and just returns the string directly. You'd find that the object returned by alloc in that code is different than the one returned by the init... call.

edited Mar 04 '13 at 17:02

Regexident

29,441
10
93
100

answered Mar 04 '13 at 15:05

bbum

162,346
23
271
359

Thanks to @regexident for cleaning up formatting! – bbum Mar 04 '13 at 17:51

NSString retain count in Objective-C

1 Answers1

Linked

Related