UIScrollView - 添加子視圖，使其居中水平和垂直

Question

如何在代碼中將UIImageView添加到UIScrollView以使其顯示在中心。

滾動視圖填充大面積，UIImage視圖平均大小約爲40％。

Answer 1

如何imageView.center = scrollView.center

Answer 2

什麼周圍的東西線...

int size = 20; 

UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; 

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((scrollView.center.x - (size/2)), (scrollView.center.y - (size/2)), size, size)]; 

[scrollView addSubview:imageView];