使用NSDictionary在NSArray中插入对象

Question

我试图使用NSArray中的数据创建一个对象的NSArray。所以，我尝试复制自动插入下面的对象

这是的起始位置

    candyArray = [NSArray arrayWithObjects:
                  [Candy candyOfCategory:@"chocolate" name:@"chocolate bar"],
                  [Candy candyOfCategory:@"chocolate" name:@"chocolate chip"],
                  [Candy candyOfCategory:@"chocolate" name:@"dark chocolate"],
                  [Candy candyOfCategory:@"hard" name:@"lollipop"],
                  [Candy candyOfCategory:@"hard" name:@"candy cane"],
                  [Candy candyOfCategory:@"hard" name:@"jaw breaker"],
                  [Candy candyOfCategory:@"other" name:@"caramel"],
                  [Candy candyOfCategory:@"other" name:@"sour chew"],
                  [Candy candyOfCategory:@"other" name:@"peanut butter cup"],
                  [Candy candyOfCategory:@"other" name:@"gummi bear"], nil];

这是我自动化的尝试

NSArray *entries = [feed objectForKey:@"bookmarks"];
NSMutableArray *nameInsert;
for (NSDictionary *item in entries)
{
    [nameInsert addObject: [Candy candyOfCategory:@"chocolate" name:[item objectForKey:@"name"]]];
}
candyArray = nameInsert;

为什么nameInsert不包含任何内容，而条目的数据有两个输入？

感谢

Answer 1

您没有初始化nameInsert数组。

更换

NSMutableArray *nameInsert;

带有

NSMutableArray *nameInsert = [NSMutableArray arrayWithCapacity:entries.count];