TangramLayoutTypeMap在pod中找不到

[PJStation]

pod 'Tangram', '~> 2.1.5'

- (instancetype)init
{
    if (self = [super init]) {
        _layoutTypeMap = [[NSMutableDictionary alloc]init];
        NSString *layoutMapPath = [[NSBundle mainBundle] pathForResource:@"TangramLayoutTypeMap" ofType:@"plist"];
        [_layoutTypeMap addEntriesFromDictionary:[TangramDefaultLayoutFactory decodeTypeMap:[NSArray arrayWithContentsOfFile:layoutMapPath]]];
    }
    return self;
}

layoutMapPath 为nil