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Editorial Team
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Asked: 2026-05-31T20:58:30+00:00

@property (retain) NSString *testString; self.testString = [[NSString alloc] initWithString:@aaa]; [self.testString retain]; self.testString = [NSString

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@property (retain) NSString *testString;
self.testString = [[NSString alloc] initWithString:@"aaa"];
[self.testString retain];    
self.testString = [NSString stringWithString:@"a"];
[self.testString release];
[self.testString release];

Let’s go line by line:

Line 2: retain count of testString = 2
Line 3: retain count of testString = 3
Line 4: retain count of testString = 1
Line 5: retain count of testString = 0
Line 6: it should crash

Even if there’s other stuff holding to testString in CoreFoundation, it eventually will go away. But the app never crash due to this.

Anyone could explain this? Thanks!

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1 Answer

  1. Editorial Team

    I am not an expert about this, so please take this with a grain of salt. I guess that [NSString stringWithString:@"a"] will probably just return the literal string @"a", i.e. it just returns its argument. As @"a" is a literal, it probably resides in constant memory and can’t be deallocated (so it should be initialized with a very high retain count).

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