在谷歌地图IOS中设置Markerinfo窗口的位置？

我正在使用需要使用自定义弹出窗口的地图应用程序。我添加了自定义视图，但无法设置自定义弹出窗口的位置

这是我的密码

- (UIView *)mapView:(GMSMapView *)mapView markerInfoWindow:(GMSMarker *)marker {

UIView *view=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 156, 36)];
UIImageView *imgView=[[UIImageView alloc]initWithFrame:view.frame];
[imgView setImage:[UIImage imageNamed:@"markerBg.png"]];
[view addSubview:imgView];

UIImageView *imgRightArrow=[[UIImageView alloc]initWithFrame:CGRectMake(130, 13, 8, 10)];
[imgRightArrow setImage:[UIImage imageNamed:@"arrow1.png"]];
[view addSubview:imgRightArrow];


UILabel *lbl=[[UILabel alloc]initWithFrame:CGRectMake(20, 0, 110, 36)];
[lbl setText:marker.title];
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[Utility getColor:@"00AAE8"]];
[lbl setFont:[UIFont systemFontOfSize:12.0f]];
[view addSubview:lbl];




return view;

}

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