NSArray 排序

先研究一种方法

        NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:];
        for (int i = ; i < ; i++) {
            int a = arc4random()%;
            [array addObject:@(a)];
        }

        NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(NSNumber *obj1,NSNumber *obj2) {
            if ([obj1 intValue] > [obj2 intValue]) {
                return NSOrderedDescending;
            }
            return (NSComparisonResult)NSOrderedAscending;
        }];
    NSLog(@"%@", sortedArray);