iOS给字典的key值排序

//通过取出字典的所有key值，利用sortedArrayUsingComparator进行降序排序
- (NSMutableArray *)reqDiction:(NSDictionary *)dict{

    NSArray *allKeyArray = [dict allKeys];
    NSArray *afterSortKeyArray = [allKeyArray sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        NSComparisonResult resuest = [obj2 compare:obj1];  //[obj1 compare:obj2]：升序
        return resuest;
    }];
    NSLog(@"afterSortKeyArray:%@",afterSortKeyArray);
    
    //通过排列的key值获取value
    NSMutableArray *valueArray = [NSMutableArray array];
    for (NSString *sortsing in afterSortKeyArray) {
        NSString *valueString = [dict objectForKey:sortsing];
        [valueArray addObject:valueString];
    }

    return valueArray;
}