Question

Lets say I want a BOOL to indicate the status of something. Then I call a class method that uses a recursive function to construct a certain string. Is there anyway to keep this BOOL outside of the class method so that it s status can change outside of the recursion? I m finding a hard to ask this question clearly but I m hoping you guys know what I m trying to ask :/

Answer 1

有两个首要办法:

(1) 多个档案可查:

<>strong>MON GlobalBOOL.h

extern BOOL MONGlobalBOOL;

<>strong>MON GlobalBOOL.m

BOOL MONGlobalBOOL = NO;

2) 有一份档案可查:

<>strong>MON GlobalBOOL.m

static BOOL MONGlobalBOOL = NO;

你不会在你的头脑中希望这样做,因为这样做只会给每个翻译提供变数的复印件。

使用:

+ (void)method
{
  if (MONGlobalBOOL) {
    ...
  }
}

令人关心的全球反常数据常常使邪恶化为乌有。你们有可能通过在僵局中形成一个地方变量来解决你的具体问题。

Answer 2

就语言支持而言,在C项目标中可以做任何事情。因此,你可能只想使用静态变量:

static BOOL globalFlag

当然,如果你只想提及休养方法中的变数,因为你想从更深入地重新采用这种方法向停靠的方法发出国旗,那么你可以参考:

- (void)someMethodWithRecursionFlag:(BOOL *)recursionFlag;

并在需要时参考:

*recursionFlag = YES;

and reading it when you re interested in it:

[self someMethodWithRecursionFlag:recursionFlag];
if (*recursionFlag)
    [self doSomethingInteresting];

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