如何通过特定属性按降序对自定义对象的NSArray进行排序? [英] How to sort NSArray of custom objects by a specific property in descending order?

问题描述

如何使这段代码按降序排列.这段代码总是给我数组升序:

How do I make this piece of code to order in descending order. This code always gives me the array in ascending order:

NSArray *sortedProductsByStyle = [unsortedProducts sortedArrayUsingComparator: ^(Product *p1, Product *p2) {
        return [p1.productStyle compare:p2.productStyle options:NSNumericSearch];
    }];

我认为使用NSOrderedDescending可以工作，但不能:

I thought that using NSOrderedDescending would work but it didn't:

NSArray *sortedProductsByStyle = [unsortedProducts sortedArrayUsingComparator: ^(Product *p1, Product *p2) {
        return [p1.productStyle compare:p2.productStyle options:NSNumericSearch | NSOrderedDescending];
    }];

有什么想法吗?

推荐答案

仅反转比较顺序怎么样?

How about just inverting the compare order?

NSArray *sortedProductsByStyle = [unsortedProducts sortedArrayUsingComparator: ^(Product *p1, Product *p2) {
    return [p2.productStyle compare:p1.productStyle options:NSNumericSearch];
}];

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