[英]How to resize UIImageView by image size in Swift
我想使用變焦增加圖像。 我這樣做了,是否等於圖像的字號大小,但是我仍然像上面這樣改變背景呢? 我該怎么做?
我的imageView在viewDidLoad中
imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height))
imageView.backgroundColor = .greenColor()
imageView.image = UIImage(contentsOfFile: document.documentImageURL)
imageView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight] //
func setZoomScale() {
let widthRatio = imageView.bounds.size.width / (imageView.image?.size.width)!
let heightRatio = imageView.bounds.size.height / (imageView.image?.size.height)!
let scale = min(widthRatio, heightRatio)
let imageWidth = scale * (imageView.image?.size.width)!
let imageHeight = scale * (imageView.image?.size.height)!
imageView.frame = CGRect(x: 0, y: 0, width: imageWidth, height: imageHeight)
}
我那樣做
override func viewDidLoad() {
super.viewDidLoad()
let image = UIImage(contentsOfFile: document.documentImageURL)
imageView = UIImageView(image: image)
imageView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
scrollView = UIScrollView(frame: view.bounds)
scrollView.delegate = self
scrollView.backgroundColor = UIColor(red: 129/255.0, green: 130/255.0, blue: 130/255.0, alpha: 1.0)
scrollView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
scrollView.showsHorizontalScrollIndicator = false
scrollView.showsVerticalScrollIndicator = false
scrollView.addSubview(imageView)
view.addSubview(scrollView)
newZoomScale()
scrollView.setZoomScale(scrollView.minimumZoomScale, animated: false)
setGesture()
setNavigationBar()
}
private func newZoomScale() {
let imageViewSize = imageView.bounds.size
let scrollViewSize = scrollView.bounds.size
let widthScale = scrollViewSize.width / imageViewSize.width
let heightScale = scrollViewSize.height / imageViewSize.height
scrollView.minimumZoomScale = min(widthScale, heightScale)
scrollView.zoomScale = 1.0
}
func scrollViewDidZoom(scrollView: UIScrollView) {
let imageViewSize = imageView.frame.size
let scrollViewSize = scrollView.bounds.size
let verticalPadding = imageViewSize.height < scrollViewSize.height ? (scrollViewSize.height - imageViewSize.height) / 2 : 0
let horizontalPadding = imageViewSize.width < scrollViewSize.width ? (scrollViewSize.width - imageViewSize.width) / 2 : 0
self.scrollView.contentInset = UIEdgeInsets(top: verticalPadding, left: horizontalPadding, bottom: verticalPadding, right: horizontalPadding)
}
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