ネストした辞書から値(int)の読み出し(Obj-C)

nesstedDictionary.mm

- (int) hls_param_get:(NSDictionary*) param key:(NSString*)key min_max:(int) min_max
{
    NSArray *a = [param objectForKey:key];
    NSNumber *nsnumber = (NSNumber*)a[min_max];
    NSInteger value = [nsnumber integerValue];
    return (int)value;
}

NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
    @[@0,@15],    @"HRange",
    @[@100,@200], @"LRange",
    @[@50,@200],  @"SRange",  nil];
    
int hMin = [self hls_param_get:param key:@"HRange" min_max:0];
int hMax = [self hls_param_get:param key:@"HRange" min_max:1];
int lMin = [self hls_param_get:param key:@"LRange" min_max:0];
int lMax = [self hls_param_get:param key:@"LRange" min_max:1];
int sMin = [self hls_param_get:param key:@"SRange" min_max:0];
int sMax = [self hls_param_get:param key:@"SRange" min_max:1];