1

可能重复：
“isMemberOfClass”在自定义初始化时返回“NO”

我对“isMemberOfClass”方法有些麻烦。

我有一个类，它生成并返回对象（“ MyObject”）

// ObjectFactory.h
...
-(MyObject*)generateMyObject;
...

// ObjectFactory.m
...
-(MyObject*)generateMyObject
{
    MyObject *obj = [[MyObject alloc]init];
    obj.name = @"Whatever";      // set properties of object
    return obj;
}
...

还有一个 unittest-class，它调用generateMyObject-selector 并检查返回对象的类：

...
ObjectFactory *factory = [[ObjectFactory alloc]init];
MyObject *obj = [factory generateMyObject];
if (![obj isMemeberOfclass:[MyObject class]])
    STFail(@"Upps, object of wrong class returned...");
else
...

我希望，else-part 被处理......但 STFail(...) 被调用，但为什么呢？

感谢您的帮助！问候，马特劳

好的，这是原始复制和粘贴的代码：

//testcase
- (void)test001_setCostumeFirstCostume
{
    NSString *xmlString = @"<Bricks.SetCostumeBrick><costumeData reference=\"../../../../../costumeDataList/Common.CostumeData\"/><sprite reference=\"../../../../..\"/></Bricks.SetCostumeBrick>";
    NSError *error;
    NSData *xmlData = [xmlString dataUsingEncoding:NSASCIIStringEncoding];
    GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:xmlData
                                                           options:0 error:&error];
    SetCostumeBrick *newBrick = [self.parser loadSetCostumeBrick:doc.rootElement];
    if (![newBrick isMemberOfClass:[SetCostumeBrick class]])
        STFail(@"Wrong class-member");
}

// "MyObject"
@implementation SetCostumeBrick
@synthesize indexOfCostumeInArray = _indexOfCostumeInArray;

- (void)performOnSprite:(Sprite *)sprite fromScript:(Script*)script
{
    NSLog(@"Performing: %@", self.description);

    [sprite performSelectorOnMainThread:@selector(changeCostume:) withObject:self.indexOfCostumeInArray waitUntilDone:true];
}

- (NSString*)description
{
    return [NSString stringWithFormat:@"SetCostumeBrick (CostumeIndex: %d)", self.indexOfCostumeInArray.intValue];
}

@end

// superclass of SetCostumeBrick
@implementation Brick
- (NSString*)description
{
    return @"Brick (NO SPECIFIC DESCRIPTION GIVEN! OVERRIDE THE DESCRIPTION METHOD!";
}

//abstract method (!!!)
- (void)performOnSprite:(Sprite *)sprite fromScript:(Script*)script
{
    @throw [NSException exceptionWithName:NSInternalInconsistencyException
                                   reason:[NSString stringWithFormat:@"You must override %@ in a subclass", NSStringFromSelector(_cmd)]
                                 userInfo:nil];
}
@end

// the "factory" (a xml-parser)
- (SetCostumeBrick*)loadSetCostumeBrick:(GDataXMLElement*)gDataSetCostumeBrick
{
    SetCostumeBrick *ret = [[SetCostumeBrick alloc] init];

    NSArray *references = [gDataSetCostumeBrick elementsForName:@"costumeData"];
    GDataXMLNode *temp = [(GDataXMLElement*)[references objectAtIndex:0]attributeForName:@"reference"];
    NSString *referencePath = temp.stringValue;

    if ([referencePath length] > 2)
    {
        if([referencePath hasSuffix:@"]"]) //index found
        {
            NSString *indexString = [referencePath substringWithRange:NSMakeRange([referencePath length]-2, 1)];
            ret.indexOfCostumeInArray = [NSNumber numberWithInt:indexString.intValue-1];
        }
        else 
        {
            ret.indexOfCostumeInArray = [NSNumber numberWithInt:0];
        }
    }
    else 
    {
        ret.indexOfCostumeInArray = nil;
        @throw [NSException exceptionWithName:NSInternalInconsistencyException
                                       reason:[NSString stringWithFormat:@"Parser error! (#1)"]
                                     userInfo:nil];
    }

    NSLog(@"Index: %@, Reference: %@", ret.indexOfCostumeInArray, [references objectAtIndex:0]);

    return ret;
}

解决方案：

Eiko/jrturton 给了我一个解决方案的链接 - thx: isMemberOfClass 在从 UIStoryboard 实例化 ViewController 时返回 no

问题是，这些类都包含在两个目标（应用程序和测试包）中

谢谢你们的帮助:)

4

2 回答 2

2

您通常需要 isKindOfClass:，而不是 isMemberOfClass。如果接收者是相关类的子类的成员，isKindOfClass: 将返回 YES，而 isMemberOfClass: 在相同情况下将返回 NO。

if ([obj isKindOfClass:[MyObject class]])

例如，

NSArray *array = [NSArray array];

这里[array isMemberOfClass:[NSArray class]]将返回 NO 但[array isKindOfClass:[NSArray class]]将返回 YES。

于 2012-10-03T15:51:30.657 回答
0

好的，根据您的评论使用不同的课程地址，我想我可以将其追踪为与此重复：

当从 UIStoryboard 实例化 ViewController 时，isMemberOfClass 返回 no

基本上，您的课程包含两次。

于 2012-10-03T19:00:16.870 回答