How to sort NSArray of custom objects by a specific property in descending order?

问题:

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];     }]; 

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];     }]; 

Any ideas?

回答1:

How about just inverting the compare order?

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

回答2:

Try this way...

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

Let me know if you have any problem.

文章来源: How to sort NSArray of custom objects by a specific property in descending order?