NSMutableArray 不应该保留添加的对象吗？
您好，我遇到了 Linux/GNUstep 的问题。我的 NSMutableArray 似乎没有保留任何添加的对象。他们不应该吗？示例：
NSString * str = @"test";
NSMutableArray * arr = [[NSMutableArray alloc] init];
NSLog(@"before add retainCount: %d", [str retainCount]);
[arr addObject: str];
NSLog(@"after add retainCount: %d", [str retainCount]);
输出：
before add retainCount: 1
after add retainCount: 1
Hi I am facing an issue with Linux / GNUstep. My NSMutableArray(s) do not seem to retain any added objects to them. Shouldn't they? Example:
NSString * str = @"test";
NSMutableArray * arr = [[NSMutableArray alloc] init];
NSLog(@"before add retainCount: %d", [str retainCount]);
[arr addObject: str];
NSLog(@"after add retainCount: %d", [str retainCount]);
Output:
before add retainCount: 1
after add retainCount: 1
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（第一：您永远不应该依赖
-retainCount。）在幕后，常量字符串（定义为
@"foo"的字符串）的特殊之处在于-retain和-release实际上并没有做任何事情；作为优化，它们始终将保留计数设置为 1。如果您执行以下操作：
您可能会看到您所期望的结果。
(First: You should never rely on
-retainCount.)Under the hood, constant strings (strings defined as, e.g.,
@"foo") are special in that-retainand-releasedon't actually do anything; they're always around with a retain count of 1 as an optimization.If you do something like:
You may see what you expect.