#import "NSMutableArray+Convert.h"

@implementation NSMutableArray (Convert)

    NSMutableArray *arr1 = [[NSMutableArray alloc] initWithCapacity:1];
    for (NSInteger i = [arr count] - 1; i >= 0; i--) {
        [arr1 addObject:arr[i]];
    }
    
    return arr1;
}
@end

数组倒序文件,用时可以直接用