NSArray在传递时变为NSCFArray [英] NSArray becomes NSCFArray when passed

问题描述

我有一个方法接收许多不同类型的对象，并决定如何处理：

   - （void）我们可以使用下面的代码来实现这个目的。 
 NSLog（@ -  NEW ACTION ARRAY  - ）; 
 if（[myAction isMemberOfClass：[Look class]]）{
 currentActionArray = [self createLookArray：（Look *）myAction item：myItem]; 
} else if（[myAction isMemberOfClass：[Use class]]）{
 currentActionArray = [self createUseArray：（Use *）myAction item：myItem]; 
} else if（[myAction isMemberOfClass：[Exit class]]）{
 currentActionArray = [self createExitArray：（Exit *）myAction item：myItem]; 
} else if（[myAction isMemberOfClass：[NSArray class]]）{
 NSLog（@--- CUSTOM ACTION ---％@，myAction）; 
 currentActionArray =（NSArray *）myAction; 
} 
 [self performNextAction]; 
  

}

通过这里：看，使用，退出或NSArray。

现在，当我从其他地方传递NSArray时，像这样：

p>

  NSArray * myAction = [[NSArray alloc] initWithObjects：myAction1，myAction2，nil]; 
 [controller performAction：myAction withItem：nil]; 
 

...自定义操作从未被调用，因为它将myAction读为NSCFArray，而不是NSArray 。当我尝试[myAction isMemberOfClass：[NSCFArray类]]它不能识别CF。现在让它工作的简单方法只是假设任何不是一个看，使用或退出是一个NSArray（摆脱最后一个如果，只是把它作为一个else），但似乎马虎我。

任何人都知道如何处理这个问题。

谢谢，
-k。您可以尝试使用 isKindOfClass：，而不是。 isMemberOfClass：。

第一个会为您发送的类的实例或其子类的对象返回YES，可能是 NSCFArray 的情况。

I have a method that receives many different kinds of objects and decides what to do with them:

-(void)performAction:(NSObject *)myAction withItem:(Item *)myItem {

actionCount = -1;
NSLog(@"-- NEW ACTION ARRAY --");
if ([myAction isMemberOfClass:[Look class]]) {
    currentActionArray = [self createLookArray:(Look *)myAction item:myItem];
} else if ([myAction isMemberOfClass:[Use class]]) {
    currentActionArray = [self createUseArray:(Use *)myAction item:myItem];
} else if ([myAction isMemberOfClass:[Exit class]]) {
    currentActionArray = [self createExitArray:(Exit *)myAction item:myItem];
} else if ([myAction isMemberOfClass:[NSArray class]] ) {
    NSLog(@"--- CUSTOM ACTION --- %@", myAction);
    currentActionArray = (NSArray *)myAction;
} 
[self performNextAction];

}

One of four things is going to come through here: Look, Use, Exit or NSArray. The first three are sent off to become NSArrays, the last is already an NSArray.

Now, when I do pass an NSArray in here from elsewhere, like this:

    NSArray *myAction = [[NSArray alloc] initWithObjects:myAction1, myAction2, nil];
[controller performAction:myAction withItem:nil];

...the custom action is never called, because it reads myAction as an NSCFArray rather than an NSArray. When I try [myAction isMemberOfClass:[NSCFArray class]] it doesn't recognise the CF. The simple way to get it working at the moment is just to assume that anything not a Look, Use or Exit is an NSArray (get rid of the last else if, and just leave it as an else), but that seems sloppy to me.

Anyone know how I can deal with this?

Thanks, -k.

解决方案

You can try using isKindOfClass: instead of isMemberOfClass:.

The first one will return YES for objects that are either instances of the class you send, or subclasses of it, as it may be the case for NSCFArray.

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