Question

我收到了错误消息，但不知道如何摆脱它。

-- Method returns an Objective-C object with a +1 retain count (owning reference)

和

--Object allocated on line 46 is not referenced later in this execution path and has a retain count of +1 (object leaked)

对于aAA和bBB行

+ ( CustConf* ) initEmptyCustConf { 
    CustConf* theObject = [[CustConf alloc] init];
    theObject.ID = 0;
    theObject.aAA= [[NSString alloc] initWithString:@""];
    theObject.Number_Ndx = 0;
    theObject.bBB = [[NSString alloc] initWithString:@""];

    return [theObject autorelease];
}

Answer 1

[[NSString alloc] initWithString:@""];是不必要的。只需使用@""。

将您的initEmptyCustConf更改为：

+ (CustConf *) initEmptyCustConf { 
    CustConf *theObject = [[CustConf alloc] init];
    theObject.ID = 0;
    theObject.aAA = @"";
    theObject.Number_Ndx = 0;
    theObject.bBB = @"";
    return [theObject autorelease];
}

Answer 2

我假设你已经为CustConf类定义了保留属性。由于对象将自动保留字符串aAA和bBB，并且在方法结束之前尚未在代码中释放它们，因此最终会泄漏内存。

+ ( CustConf* ) initEmptyCustConf { 
    CustConf* theObject = [[CustConf alloc] init];
    theObject.ID = 0;
    theObject.aAA= [[NSString alloc] initWithString:@""]; //potential leak
    theObject.Number_Ndx = 0;
    theObject.bBB = [[NSString alloc] initWithString:@""]; //potential leak

    return [theObject autorelease];
}

要解决此问题，您需要通过release / autorelease显式释放分配给theObject.aAA和theObject.bBB的字符串，或者只使用字符串常量。

+ ( CustConf* ) initEmptyCustConf { 

   CustConf* theObject = [[CustConf alloc] init];
    theObject.ID = 0;
    theObject.aAA= @"";
    theObject.Number_Ndx = 0;
    theObject.bBB = @"";

    return [theObject autorelease];
}

此外，如果您的方法以“init”开头，则返回保留对象是自定义的，因此请在结尾处删除自动释放，或更改方法名称以反映方法的性质。

xcode，分析alloc上的错误

2 个答案: