降序排序

NSMutableArray *arr = [NSMutableArray arrayWithObjects:@"abc",@"bcd",@"123",@"9987", nil];                NSComparisonResult (^block)(NSString *str1, NSString *str2) = ^(NSString *str1, NSString *str2){            return -[str1 compare:str2];        };        NSArray *arr1 =[arr sortedArrayUsingComparator:block];        NSLog(@"%@",arr1);

升序排序

NSMutableArray *arr = [NSMutableArray arrayWithObjects:@"abc",@"bcd",@"123",@"9987", nil]; NSComparisonResult (^block)(NSString *str1, NSString *str2) = ^(NSString *str1, NSString *str2){ return [str1 compare:str2]; };  

NSArray *arr1 =[arr sortedArrayUsingComparator:block];  

NSLog(@"%@",arr1);