Swift 以编程方式将视图水平添加到UIScrollView
我正在尝试将三个相同的ImageView堆叠在一起。图像比屏幕大,我希望能够向右滚动,看到图像重复三次,如果我到了最后。这些视图一直叠在一起,而不是挨在一起。我不知道我做错了什么。任何帮助都将不胜感激 这是我的密码:Swift 以编程方式将视图水平添加到UIScrollView,swift,uiscrollview,constraints,Swift,Uiscrollview,Constraints,我正在尝试将三个相同的ImageView堆叠在一起。图像比屏幕大,我希望能够向右滚动,看到图像重复三次,如果我到了最后。这些视图一直叠在一起,而不是挨在一起。我不知道我做错了什么。任何帮助都将不胜感激 这是我的密码: func stackThreeImagesHorizontallyToScrollView(imageToStack :UIImage, scrollView: UIScrollView){ var previousAnchor = scrollVi
func stackThreeImagesHorizontallyToScrollView(imageToStack :UIImage, scrollView: UIScrollView){
var previousAnchor = scrollView.contentLayoutGuide.leadingAnchor
for i in 0 ..< 3 {
let imageViewToStack = UIImageView(image: imageToStack)
switch i {
case 0:
imageViewToStack.backgroundColor = UIColor.green
break
case 1:
imageViewToStack.backgroundColor = UIColor.purple
break
case 2:
imageViewToStack.backgroundColor = UIColor.yellow
break
default: break
}
scrollView.addSubview(imageViewToStack)
NSLayoutConstraint.activate([
imageViewToStack.leadingAnchor.constraint(equalTo: previousAnchor, constant: 0),
imageViewToStack.heightAnchor.constraint(equalToConstant: imageToStack.size.height),
imageViewToStack.widthAnchor.constraint(equalToConstant: imageToStack.size.width),
imageViewToStack.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 0),
imageViewToStack.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: 0),
imageViewToStack.trailingAnchor.constraint(equalTo: imageViewToStack.leadingAnchor, constant: imageToStack.size.width)
])
previousAnchor = imageViewToStack.trailingAnchor
}
previousAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: 0).isActive = true
}
func stackThreeImagesHorizontallyToScrollView(imageToStack:UIImage,scrollView:UIScrollView){
var previousAnchor=scrollView.contentLayoutGuide.leadingAnchor
对于0..<3中的i{
让imageViewToStack=UIImageView(图像:imageToStack)
开关i{
案例0:
imageViewToStack.backgroundColor=UIColor.green
打破
案例1:
imageViewToStack.backgroundColor=UIColor.purple
打破
案例2:
imageViewToStack.backgroundColor=UIColor.yellow
打破
默认值:中断
}
scrollView.addSubview(imageViewToStack)
NSLayoutConstraint.activate([
imageViewToStack.leadingAnchor.constraint(等式:previousAnchor,常量:0),
imageViewToStack.heightAnchor.constraint(相等常量:imageToStack.size.height),
imageViewToStack.widthAnchor.constraint(相等常量:imageToStack.size.width),
imageViewToStack.topAnchor.constraint(等式:scrollView.topAnchor,常量:0),
imageViewToStack.bottomAnchor.constraint(等式:scrollView.bottomAnchor,常量:0),
imageViewToStack.trailingAnchor.constraint(等式:imageViewToStack.leadingAnchor,常量:imageToStack.size.width)
])
previousAnchor=imageViewToStack.trailingAnchor
}
previousAnchor.constraint(equalTo:scrollView.trailingAnchor,常量:0)。isActive=true
}
您忘记将imageViewToStack
的translatesAutoResizengmaskintoConstraints
属性设置为false
:
func stackThreeImagesHorizontallyToScrollView(imageToStack:UIImage,scrollView:UIScrollView){
var previousAnchor=scrollView.contentLayoutGuide.leadingAnchor
对于0..<3中的i{
让imageViewToStack=UIImageView(图像:imageToStack)
///添加这一行
imageViewToStack.TranslatesAutoResizengMaskinToConstraints=false
开关i{
案例0:
imageViewToStack.backgroundColor=UIColor.green
打破
案例1:
imageViewToStack.backgroundColor=UIColor.purple
打破
案例2:
imageViewToStack.backgroundColor=UIColor.yellow
打破
默认值:中断
}
scrollView.addSubview(imageViewToStack)
NSLayoutConstraint.activate([
imageViewToStack.leadingAnchor.constraint(等式:previousAnchor,常量:0),
imageViewToStack.heightAnchor.constraint(相等常量:imageToStack.size.height),
imageViewToStack.widthAnchor.constraint(相等常量:imageToStack.size.width),
imageViewToStack.topAnchor.constraint(等式:scrollView.topAnchor,常量:0),
imageViewToStack.bottomAnchor.constraint(等式:scrollView.bottomAnchor,常量:0),
imageViewToStack.trailingAnchor.constraint(等式:imageViewToStack.leadingAnchor,常量:imageToStack.size.width)
])
previousAnchor=imageViewToStack.trailingAnchor
}
previousAnchor.constraint(equalTo:scrollView.trailingAnchor,常量:0)。isActive=true
}