Objective-C使用字典和数组抛出NSInvalidArgumentException

我试图遵循一个教程,并在我自己的代码实现它。

这就是我遇到的问题-

data、wishlists和wishlistid都是nsmutablearray。我知道这个问题发生在我试图将字典添加到数据数组的行上。看看代码:

- (void)setupWishlists:(NSString *)informationReturned
{
    if(![informationReturned isEqualToString:@""]){
        //[data setArray:[informationReturned componentsSeparatedByString:@"."]]; //this works too, its an old method I kept just incase... this one has the raw combined wishlists name and id together. Here I attempt to split them.

        NSMutableArray *temporaryArray = [NSMutableArray array];
        NSArray *rawArray = [informationReturned componentsSeparatedByString:@"."];
        for (NSString *item in rawArray) {
            //so pretty much here we have the raw information that came back... remove the IDs
            [temporaryArray setArray:[item componentsSeparatedByString:@","]];
            [wishlists addObject:[temporaryArray objectAtIndex:0]];
            [wishlistids addObject:[temporaryArray objectAtIndex:1]];
        }
        //Initialize the array.
        NSDictionary *myWishlistsDict = [NSDictionary dictionaryWithObject:[NSArray arrayWithArray:wishlists] forKey:@"My Wishlists"];

        [data addObject:myWishlistsDict]; //GETTING PROBLEM HERE!!! IF I COMMENT THIS LINE IT IS FINE   
    }
    NSLog(@"Raw Wishlists Array: %@", [data description]);
}

另外,我确定要在这个函数之前运行的函数中分配所有这些数组等。

data = [[NSMutableArray alloc] init];   
wishlists = [[NSMutableArray alloc] init];
wishlistids = [[NSMutableArray alloc] init];

这是错误(在控制台中看到:

2010-08-26 19:53:47.598 LoginApp[7604:207] -[__NSCFDictionary isEqualToString:]: unrecognized selector sent to instance 0x59b5760
2010-08-26 19:53:47.600 LoginApp[7604:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary isEqualToString:]: unrecognized selector sent to instance 0x59b5760'

不管怎样我觉得我漏掉了什么。。。如果我有请告诉我,我一定会很快回答。