[英]Cannot set backgroundColor of UIView which is a subview of UIScrollView in Swift
I try to add some UIView objects as subviews to a UIScrollView and give them random color. 我尝试将一些UIView对象作为子视图添加到UIScrollView并为其赋予随机颜色。 But these UIView objects' backgroundColor are white.
但是这些UIView对象的backgroundColor是白色的。 Why can't I set their backgroundColor?
为什么不能设置他们的backgroundColor?
I run this project on iOS 10.1, Swift 3.0.1 and SnapKit 3.0.2. 我在iOS 10.1,Swift 3.0.1和SnapKit 3.0.2上运行此项目。 Here is code in
viewDidLoad
: 这是
viewDidLoad
代码:
let scrollView = UIScrollView.init()
scrollView.isPagingEnabled = true
self.view.addSubview(scrollView)
scrollView.snp.makeConstraints { (make) in
make.left.right.top.bottom.equalTo(self.view)
}
var lastView: UIView? = nil
for i in 0 ..< 5 {
let colorView = UIView.init()
let red = CGFloat(arc4random() % 256) / 255.0
let blue = CGFloat(arc4random() % 256) / 255.0
let green = CGFloat(arc4random() % 256) / 255.0
colorView.backgroundColor = UIColor.init(red: red, green: green, blue: blue, alpha: 1.0)
scrollView.addSubview(colorView)
colorView.snp.makeConstraints({ (make) in
make.top.bottom.equalTo(scrollView)
make.width.equalTo(scrollView)
if i == 0 {
make.left.equalTo(scrollView)
}
else {
make.left.equalTo((lastView?.snp.right)!)
}
if i == 4 {
make.right.equalTo(scrollView)
}
})
lastView = colorView
}
I think the problem is that the backgroundColor
of scrollView
will cover on the `colorView'. 我认为问题是,
backgroundColor
的scrollView
将覆盖在'colorView”。
您是否可能需要添加make.height.equalTo(scrollView)
...我没有看到高度限制...
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