我是否必须保留/释放从 NSDictionary 获取的值？
通常我会做这样的事情（如下）来获取我需要的值：
NSDictionary *state = [notification.userInfo objectForKey:@"state"];
[self.tabBarItem setBadgeValue:[state objectForKey:@"short"]];
但是对于从 NSDictionary 获取的值是否值得保留/释放？像这样：
NSDictionary *state = [[notification.userInfo objectForKey:@"state"] retain];
[self.tabBarItem setBadgeValue:[state objectForKey:@"short"]];
[state release];
它对内存更友好吗？或者我不应该打扰并只信任自动释放池来完成它的工作？
Normally I do something like this (below) to get value I need:
NSDictionary *state = [notification.userInfo objectForKey:@"state"];
[self.tabBarItem setBadgeValue:[state objectForKey:@"short"]];
But does it worth to do retain/release for values taken from NSDictionary? Something like this:
NSDictionary *state = [[notification.userInfo objectForKey:@"state"] retain];
[self.tabBarItem setBadgeValue:[state objectForKey:@"short"]];
[state release];
Is it more memory friendly? Or I shouldn't bother and just trust to autorelease pool to do its job?
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不，这样做没有意义。
[notification.userInfo objectForKey:@"state"]的结果始终是一个自动释放的对象；如果您添加额外的retain和release，那不会改变任何东西。No, there's no point in doing that. The result of
[notification.userInfo objectForKey:@"state"]is always an autoreleased object; if you add an extraretainandrelease, that won't change anything.