修改 Objective-C 方法中的输入 NSString 值
在内存管理方面，下面的方法修改输入变量content是否正确？
- (NSMutableArray *) extractResults:(NSString *)content {
...
regex = [NSRegularExpression ...];
content = [regex stringByReplacingMatchesInString:content
options:0
range:NSMakeRange(0, [content length])
withTemplate:@""];
...
}
在这种特殊情况下，我不关心该值是否在方法范围之外保持修改。只是想知道该分配是否会产生内存泄漏。
谢谢！
In terms of memory management, is it correct to modify the input variable content in the following method?
- (NSMutableArray *) extractResults:(NSString *)content {
...
regex = [NSRegularExpression ...];
content = [regex stringByReplacingMatchesInString:content
options:0
range:NSMakeRange(0, [content length])
withTemplate:@""];
...
}
In this particular case I do not care if the value remains modified outside the method scope. Just wondering if that assignment produces a memory leak.
Thanks!
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评论（2）
不会，它不会产生泄漏，因为
stringByReplacing...的返回值是自动释放的。但是，您应该意识到您根本没有修改content对象。NSString是不可变的，所以你不能这样做，你正在创建一个新实例并将其分配给变量。No, it doesn't produce a leak because the return value of
stringByReplacing...is autoreleased. However, you should be aware that you are not modifying thecontentobject at all.NSStringis immutable, so you can't do that, you're creating a new instance and assigning it to the variable.由于
content变量是您的本地变量，因此它是正确的。您只需更改存储在变量content中的内存地址。不要忘记释放您传入变量content的内存。As
contentvariable is your local variable, so it is correct. You only change memory address that is stored in variablecontent. Don't forget to release memory, that you pass in variablecontent.