ios - 按键值对 NSMutableArray 进行排序会引发异常

Question

我正在尝试NSMutableArray使用以下结构对 a 进行排序：

(
{
    Code = "390954-150";
    Size = "35";
},
{
    Code = 790540MSO;
    Size = "30";
}
)

我正在尝试根据 Code 值进行排序，NSMutableArray称为arrayProduct：

//Sort array by Code
NSSortDescriptor *aSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Code" ascending:YES];
[arrayProduct sortUsingDescriptors:[NSArray arrayWithObject:aSortDescriptor]];
//

但是上面的代码抛出了以下异常：

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFArray replaceObjectAtIndex:withObject:]: mutating method sent to immutable object'

Answer 1

你的arrayProduct样子NSArray。

尝试将其转换为NSMutableArrayand ：

NSMutableArray *mutableProducts = [NSMutableArray arrayWithArray:arrayProduct];
[mutableProducts sortUsingDescriptors:[NSArray arrayWithObject:aSortDescriptor]];