排序 NSMutableArray 内存泄漏
我的对象有一个私有 NSMutableArray 项目。我使用以下代码按大小顺序对项目中的对象进行排序：
-(void)sortItems{
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"size" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
NSArray *sortedArray = [items sortedArrayUsingDescriptors:sortDescriptors];
NSMutableArray* newArray = [[NSMutableArray alloc] initWithArray: sortedArray];
[self setItems:newArray];
[sortDescriptor release];
}
显然，这是内存泄漏，因为每次调用 sortItems 时，我都会分配新内存并分配项目以指向它。我尝试按如下方式释放旧内存：
NSMutableArray* newArray = [[NSMutableArray alloc] initWithArray: sortedArray];
NSMutableArray* oldArray = [self items];
[self setItems:newArray];
[oldArray release];
但这会产生 EXC_BAD_ACCESS 错误。我已经阅读了 objC 中的内存处理，并且我确信我在这里做了一些根本错误的事情。
任何帮助将不胜感激！
My object has a private NSMutableArray items. I am using the following code to sort the objects in items in size order:
-(void)sortItems{
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"size" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
NSArray *sortedArray = [items sortedArrayUsingDescriptors:sortDescriptors];
NSMutableArray* newArray = [[NSMutableArray alloc] initWithArray: sortedArray];
[self setItems:newArray];
[sortDescriptor release];
}
Obviously this is a memory leak here, because every time I call sortItems, I am allocing new memory and assigning items to point to it. I've tried releasing the old memory as follows:
NSMutableArray* newArray = [[NSMutableArray alloc] initWithArray: sortedArray];
NSMutableArray* oldArray = [self items];
[self setItems:newArray];
[oldArray release];
But that gives an EXC_BAD_ACCESS error. I've read up on memory handling in objC, and I'm convinced I'm doing something fundamentally wrong here.
Any help would be greatly appreciated!
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您正在泄漏新数组，而不是旧数组：
基本规则是您必须释放已分配的任何内容，并且您通常不应该关心为任何人保留内容（即
[self setItems:]），那些需要保留东西的人会自己做。我还建议将 self.items 制作为可变数组，并使用 [self.items sortUsingDescriptors:sortDescriptor 就地排序而不创建副本。
You're leaking the new array, not the old one:
The fundamental rule is that you must release anything that you have allocated, and you normally shouldn't care about keeping things retained for anyone (i.e.
[self setItems:]), those who need something retained will do it themselves.I would also recommend making
self.itemsa mutable array, and using[self.items sortUsingDescriptors:sortDescriptorto sort inplace without creating a copy.在第一个示例中无法释放 newArray 是否有原因？
Is there a reason why you cannot release the newArray in your first example?