我加入以下代码到我的UIViewController:在添加视图来UIScrollView的编程
override func viewDidLayoutSubviews() {
scrlMain.contentSize = viewBrochures.bounds.size
}
注意,我安装我的UIScrollView和我的容器视图(viewBrochures):
override func viewDidLoad() {
super.viewDidLoad()
viewBrochures.isUserInteractionEnabled = true
let brochure1: UIImageView = UIImageView(image: UIImage(named: "image1")!)
brochure1.translatesAutoresizingMaskIntoConstraints = false
brochure1.contentMode = .scaleAspectFit
brochure1.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 400)
viewBrochures.addSubview(brochure1)
let brochure2: UIImageView = UIImageView(image: UIImage(named: "image2")!)
brochure2.translatesAutoresizingMaskIntoConstraints = false
brochure2.contentMode = .scaleAspectFit
brochure2.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 400)
viewBrochures.addSubview(brochure2)
let brochure3: UIImageView = UIImageView(image: UIImage(named: "image3")!)
brochure3.translatesAutoresizingMaskIntoConstraints = false
brochure3.contentMode = .scaleAspectFit
brochure3.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 400)
viewBrochures.addSubview(brochure3)
let brochure4: UIImageView = UIImageView(image: UIImage(named: "image4")!)
brochure4.translatesAutoresizingMaskIntoConstraints = false
brochure4.contentMode = .scaleAspectFit
brochure4.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 400)
viewBrochures.addSubview(brochure4)
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure1,
attribute: .trailing,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .trailingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure1,
attribute: .leading,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .leadingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure1,
attribute: .top,
relatedBy: .equal,
toItem: viewBottomButtons,
attribute: .bottom,
multiplier: 1,
constant: 10))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure1,
attribute: .bottom,
relatedBy: .equal,
toItem: brochure2,
attribute: .top,
multiplier: 1,
constant: 10))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure2,
attribute: .trailing,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .trailingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure2,
attribute: .leading,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .leadingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure2,
attribute: .top,
relatedBy: .equal,
toItem: brochure1,
attribute: .bottom,
multiplier: 1,
constant: 10))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure2,
attribute: .bottom,
relatedBy: .equal,
toItem: brochure3,
attribute: .top,
multiplier: 1,
constant: 10))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure3,
attribute: .trailing,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .trailingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure3,
attribute: .leading,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .leadingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure3,
attribute: .top,
relatedBy: .equal,
toItem: brochure2,
attribute: .bottom,
multiplier: 1,
constant: 10))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure3,
attribute: .bottom,
relatedBy: .equal,
toItem: brochure4,
attribute: .top,
multiplier: 1,
constant: 10))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure4,
attribute: .trailing,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .trailingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure4,
attribute: .leading,
relatedBy: .equal,
toItem: viewBrochures,
attribute: .leadingMargin,
multiplier: 1,
constant: 0))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure4,
attribute: .top,
relatedBy: .equal,
toItem: brochure3,
attribute: .bottom,
multiplier: 1,
constant: 10))
viewBrochures.addConstraint(NSLayoutConstraint(item: brochure4,
attribute: .bottomMargin,
relatedBy: .greaterThanOrEqual,
toItem: viewBrochures,
attribute: .bottom,
multiplier: 1,
constant: 10))
}
而且还故事板已经有了,我只需要将图像添加到容器中,然后能够垂直滚动它们,因为它们不适合屏幕。在scrollview的容器视图中,我已经有2个其他视图需要在这些新图像之上(图像需要在2个视图之下,并且所有这些视图一起(2个视图+图像)需要在滚动视图中一起滚动)。这些其他2个视图已经添加到故事板中,没有问题。正如你所看到的,我已经创建了图像并以编程的方式向它们添加了约束。我为每张图片添加了4个约束条件,一个用于引导,一个用于尾随,一个用于顶部,另一个用于底部。最上面的图像被限制在视图底部的上方,而最底层的图像被限制在容器视图的底部,使用了更大的句柄限制。我也在SO上看到,在向代码中的scrollview添加图像时,需要将“translatesAutoresizingMaskIntoConstraints = false”添加到图像,但我不确定它在做什么以及是否需要它。
所以这段代码适用于添加图片,但问题是scrollview根本不会滚动。我不确定这是否是这样做的正确方法,所以请随时向我建议任何其他选项。正如你所看到的,我使用了自动布局和布局约束。如果您能看到我的实施有任何问题,请注意任何建议和/或更正。
嗨。感谢你的回答。我尝试过,我删除了viewBrochures,并将所有视图直接放在ScrollView下,并且确保宽度不比ScrollView的宽度宽,但仍然没有运气......它仍然不会滚动。 – instanceof
你是否已经移除了所有出现的位置?frame = ...和contentSize = ...? – joern