UIViewの結合

#pragma mark - ビューの結合
+ (UIView*)unionView:(NSArray *)viewArray{
 
    UIView *unionView = [[UIView alloc] init];
    unionView.frame = CGRectMake(0, 0, 640, 480);
 
    for (UIView *vw in viewArray) {
 
        if ( vw != nil ){
            [unionView addSubview:vw];
        }
 
    }
 
    return unionView;
}