iphone - 将项目从 NSMutableArray 复制到另一个

Question

我尝试将项目从 NSMutableArray 复制到另一个。

我在我的前两个 MutableArray(storiesRSS1 和 storiesRSS2)中添加项目:

[item setObject:currentTitle forKey:@"title"];
[item setObject:currentLink forKey:@"link"];
[item setObject:currentSummary forKey:@"summary"]; 
[item setObject:currentDate forKey:@"date"];
[item setObject:currentImage forKey:@"image"];
[item setObject:currentMovie forKey:@"movie"];
[storiesRSS1 addObject:[item copy]];


[item setObject:currentTitle forKey:@"title"];
[item setObject:currentLink forKey:@"link"];
[item setObject:currentSummary forKey:@"summary"]; 
[item setObject:currentDate forKey:@"date"];
[item setObject:currentImage forKey:@"image"];
[item setObject:currentMovie forKey:@"movie"];
[storiesRSS2 addObject:[item copy]];

对于这两个数组，它可以工作。

之后我想在第三个数组(stories)中混合两者。

int i=0;
int nbElement=[storiesRSS1 count]+[storiesRSS2 count];
while (i<nbElement) {
    if (i<[tempArrayTed count]) {
        [stories addObject:[storiesRSS1 objectAtIndex:i]];
    }
    if (i<[tempArrayYoutube count]) {
        [stories addObject:[storiesRSS2 objectAtIndex:i]];
    }
    i++;
}

但是当我尝试显示每个项目时，它总是null!

你能帮帮我吗，谢谢。

Answer 1

NSMutableArray 有一个 addObjectsFromArray: 方法，您可能会发现它很有用。

[stories addObjectsFromArray:storiesRSS1];
[stories addObjectsFromArray: storiesRSS2];

附带说明一下，当您这样做时会泄漏内存:

[storiesRSS1/2 addObject:[item copy]];