如何在Swift Xcode中制作图像重量和高度填充屏幕？

Question

我找到了一个快速制作幻灯片的代码，但无法找到，h 可以让IMAGE填满整个屏幕。 你能帮忙吗？

这是滑块的屏幕截图，你会看到我放在它上面的锚点，整个屏幕。

，这是代码;

import UIKit
class OnboardingController: UIViewController, UIScrollViewDelegate {
    let backgroundColor = UIColor(red: 241.0/255.0, green: 196.0/255.0, blue: 15.0/255.0, alpha: 1.0)
    let slides = [
        [ "image": "book4page1.png"],
        [ "image": "book4page2.png"],
        [ "image": "book4page3.png"],
    ]
    let screen: CGRect = UIScreen.mainScreen().bounds
    var scroll: UIScrollView?
    var dots: UIPageControl?
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = backgroundColor
        scroll = UIScrollView(frame: CGRect(x: 0.0, y: 0.0, width: screen.width, height: screen.height * 0.9))
        scroll?.showsHorizontalScrollIndicator = false
        scroll?.showsVerticalScrollIndicator = false
        scroll?.pagingEnabled = true
        view.addSubview(scroll!)
        if (slides.count > 1) {
            dots = UIPageControl(frame: CGRect(x: 0.0, y: screen.height * 0.875, width: screen.width, height: screen.height * 0.05))
            dots?.numberOfPages = slides.count
            view.addSubview(dots!)
        }
        for var i = 0; i < slides.count; ++i {
            if let image = UIImage(named: slides[i]["image"]!) {
                let imageView: UIImageView = UIImageView(frame: getFrame(image.size.width, iH: image.size.height, slide: i, offset: screen.height * 0.15))
                imageView.image = image
                scroll?.addSubview(imageView)
            }
            if let text = slides[i]["text"] {
                let textView = UITextView(frame: CGRect(x: screen.width * 0.05 + CGFloat(i) * screen.width, y: screen.height * 0.745, width: screen.width * 0.9, height: 100.0))
                textView.text = text
                textView.editable = false
                textView.selectable = false
                textView.textAlignment = NSTextAlignment.Center
                textView.font = UIFont.systemFontOfSize(20, weight: 0)
                textView.textColor = UIColor.whiteColor()
                textView.backgroundColor = UIColor.clearColor()
                scroll?.addSubview(textView)
            }
        }
        scroll?.contentSize = CGSizeMake(CGFloat(Int(screen.width) *  slides.count), screen.height * 0.5)
        scroll?.delegate = self
        dots?.addTarget(self, action: Selector("swipe:"), forControlEvents: UIControlEvents.ValueChanged)
        let closeButton = UIButton()
        closeButton.frame = CGRect(x: screen.width - 70, y: 20, width: 60, height: 60)
        closeButton.setTitle("Skip", forState: .Normal)
        closeButton.setTitleColor(UIColor(red: 0.0/255.0, green: 0.0/255.0, blue: 0.0/255.0, alpha: 0.5), forState: .Normal)
        closeButton.titleLabel!.font =  UIFont.systemFontOfSize(16)
        closeButton.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
        view.addSubview(closeButton)
    }
    func pressed(sender: UIButton!) {
        self.dismissViewControllerAnimated(true) { () -> Void in
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    func getFrame (iW: CGFloat, iH: CGFloat, slide: Int, offset: CGFloat) -> CGRect {
        let mH: CGFloat = screen.height * 0.50
        let mW: CGFloat = screen.width
        var h: CGFloat
        var w: CGFloat
        let r = iW / iH
        if (r <= 1) {
            h = min(mH, iH)
            w = h * r
        } else {
            w = min(mW, iW)
            h = w / r
        }
        return CGRectMake(
            max(0, (mW - w) / 2) + CGFloat(slide) * screen.width,
            max(0, (mH - h) / 2) + offset,
            w,
            h
        )
    }
    func swipe(sender: AnyObject) -> () {
        if let scrollView = scroll {
            let x = CGFloat(dots!.currentPage) * scrollView.frame.size.width
            scroll?.setContentOffset(CGPointMake(x, 0), animated: true)
        }
    }
    func scrollViewDidEndDecelerating(scrollView: UIScrollView) -> () {
        let pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width)
        dots!.currentPage = Int(pageNumber)
    }
    override func preferredStatusBarStyle() -> UIStatusBarStyle {
        return UIStatusBarStyle.LightContent
    }
}

Answer 1

在imageView集imageView.contentMode = UIViewContentMode.ScaleAspectFit

上

Answer 2

根据您希望如何缩放，您应该修改contentMode

UIImageView的

。

Answer 3

在Objective-C中你会这样做（它在Swift中类似）：

UIImageView * iv = [UIImageView new];
iv.frame = scrollView.bounds;
iv.contentMode = UIViewContentModeScaleAspectFill;
iv.clipsToBounds = true;
iv.image = [UIImage imageNamed:@"image.jpg"];
[scrollView addSubview:iv];

contentMode是您正在寻找的行。