我有以下代码,我正在尝试实现添加到垂直滚动视图的动态图像。我希望有其约束,因此图像将自身设置在scrollView的边界内。
但是结果是图像似乎保持其原始大小(比滚动视图大,因此图像被裁剪了)
这是代码:
@IBOutlet weak var myScrollView: UIScrollView!
private let lettersModel:LettersModel = LettersModel();
private var imgs = [UIImageView]();
override func viewDidLoad() {
super.viewDidLoad()
myScrollView.backgroundColor = UIColor.brownColor()
for var index=0; index<1; index++
{
let myImage:UIImage = UIImage(named: lettersModel.getLetterAt(index))!
let myImageView:UIImageView = UIImageView()
myImageView.image = myImage
myImageView.contentMode = UIViewContentMode.ScaleAspectFit
myScrollView.addSubview(myImageView)
myImageView.translatesAutoresizingMaskIntoConstraints = false;
myScrollView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[myImageView]-|", options: [], metrics: nil, views:["myImageView":myImageView] ))
imgs.append(myImageView)
}
}
UIView
的UIScrollView
大小无法与其父对象的大小相同。您可以在UIScrollView中创建一个UIView并更新其中的宽度,layoutSubviews
然后在该UIView中添加所有UIView。这是您可以执行的操作:(要执行此操作,您需要设置contentContent的高度,UIScrollView
但还必须设置它的高度才能滚动它。)
class MyScrollView : UIScrollView {
let contentView = UIView()
override init (frame : CGRect) {
super.init(frame : frame)
addSubview(contentView)
}
convenience init () {
self.init(frame:CGRect.zero)
}
required init(coder aDecoder: NSCoder) {
fatalError("This class does not support NSCoding")
}
override func layoutSubviews() {
contentView.frame.size.width = frame.width
contentView.frame.size.height = contentSize.height
super.layoutSubviews()
}
}
var myScrollView = MyScrollView(frame: CGRect(x: 0, y: 0, width: 400, height: 600))
var imgs = [UIImageView]();
let myImage = UIImage(named: "achtergrond")
let myImageView:UIImageView = UIImageView()
myImageView.image = myImage
myImageView.contentMode = UIViewContentMode.ScaleAspectFit
myScrollView.contentSize.height = 1000 // <-- setting the contentSize
myScrollView.contentView.addSubview(myImageView) // <-- You add the UIImageView to the contentView
myImageView.translatesAutoresizingMaskIntoConstraints = false;
myScrollView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[myImageView]-|", options: [], metrics: nil, views:["myImageView":myImageView] ))
imgs.append(myImageView)
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我来说两句