Question

我有以下代码

    inAppKeys = [[MKStoreManager sharedManager]  purchasableObjectsDescription ];
NSMutableArray * unremovableArray = [[NSMutableArray alloc] init];   
for(int i = 0; i<[inAppKeys count]; i++){
    for (int j=0; j< [categories count]; j++) {
        NSString * inAppKey =  [[categories objectAtIndex:j] valueForKey:@"inAppKey"];
        if([inAppKey isEqualToString: [inAppKeys objectAtIndex:i]]){
        [unremovableArray addObject:[categories objectAtIndex:j]];
        }
    }  
}


categories = [[NSMutableArray alloc] init];
[categories addObjectsFromArray:unremovableArray];

其中category是nsmutablearray ..事情是addObjectsFromArray将类别留空..我做错了什么？

Answer 1

在你甚至分配/ init类别之前，我认为你指的是[categories count]和[categories objectAtIndex：j]。

重新阅读你的标题（“重新初始化”），这表明你之前已经进入类别，我现在假设你有一组主要的类别，你试图减少到实际购买的类别。如果是这样，我不会重复使用变量“类别”，因为这令人困惑。（我假设类别是自动释放的，否则你有泄漏）。如何使用unremovableArray而不是泄漏呢？

我还会使用快速枚举器来提高清晰度和速度......

NSLog(@"categories: %@", categories);
inAppKeys = [[MKStoreManager sharedManager]  purchasableObjectsDescription ];
NSLog(@"inAppKeys:%@", inAppKeys);

NSMutableArray * unremovableCategories = [[NSMutableArray alloc] init];   
for(NSString* thisAppKey in inAppKeys) {
    for (NSDictionary* thisCategory in categories) {
        if ([[thisCategory valueForKey:@"inAppKey"] isEqualToString: thisAppKey]){
            [unremovableCategories addObject:thisCategory];
            break;  //having added this category; no reason to continue looking at it
        }
    }  
}

//now use unremovableCategories...

iphone：addObjectsFromArray在初始化nsmutablearray后没有添加

1 个答案: