iOS将字典中的键值对按照字母降序排序

//将字典中的键值对按照字母降序排序

+(NSDictionary *)dictSorting:(NSDictionary *)dict

{

 NSArray *allKeyArray = [dict allKeys];

 NSArray *afterSortKeyArray = [allKeyArray sortedArrayUsingComparator:^NSComparisonResult(id _Nonnullobj1, 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

 NSMutableDictionary *valueDic = [NSMutableDictionary dictionary];

 for (NSString *sortsing in afterSortKeyArray) {

 NSString *valueString = [dict objectForKey:sortsing];

[valueDic setObject:valueString forKey:sortsing];

    }

 return valueDic;

}