斯威夫特 - 如何申請調整內滾動視圖

Question

圖像我有以下滾動視圖代碼

class ViewController: UIViewController, UIScrollViewDelegate { 

@IBOutlet weak var scrollView: UIScrollView! 
@IBOutlet weak var pageControl: UIPageControl! 

var imageArray = [UIImage(named: "mainScrollView1"), UIImage(named: "mainScrollView2"), UIImage(named: "mainScrollView3"),] 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    configurePageControl() 

    scrollView.pagingEnabled = true 
    scrollView.showsHorizontalScrollIndicator = false 
    scrollView.delegate = self 

    for var i = 0; i < imageArray.count; i++ { 

     if i == 0 { 

      var imageView = UIImageView(frame: CGRectMake(0, 0, scrollView.frame.size.width, 160)) 
      imageView.image = imageArray[i] 
      scrollView.addSubview(imageView) 

     } else { 

      var float: CGFloat = CGFloat(i) 
      var imageView = UIImageView(frame: CGRectMake(scrollView.frame.size.width * float, 0, scrollView.frame.size.width, 160)) 
      imageView.image = imageArray[i] 
      scrollView.addSubview(imageView) 

     } 
    } 

    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width*3, scrollView.frame.size.height) 

} 

func configurePageControl() { 

    self.pageControl.numberOfPages = 3 
    self.pageControl.currentPage = 0 
    self.pageControl.tintColor = UIColor.redColor() 
    self.pageControl.pageIndicatorTintColor = UIColor.blackColor() 
    self.pageControl.currentPageIndicatorTintColor = UIColor.whiteColor() 
    self.view.addSubview(pageControl) 

} 

func scrollViewDidEndDecelerating(scrollView: UIScrollView) { 

    let pageNumber = round(scrollView.contentOffset.x/scrollView.frame.size.width) 
    pageControl.currentPage = Int(pageNumber) 
} 

}

的問題是圖像內滾動靜態的，它們不改變它們的大小不同的屏幕正因爲如此，它看起來像這樣

正如你看到的第一個圖像大小不擴展以填充整個屏幕寬度和BEC可以看到這部分第二圖像的使用

這怎麼解決？

Answer 1

您應該在視圖佈局所有子視圖之後更新圖像大小。你應該在viewDidLayoutSubviews中這樣做。

事情是這樣的：

var imageArray = [UIImage(named: "mainScrollView1"), UIImage(named: "mainScrollView2"), UIImage(named: "mainScrollView3"),] 
var imageViews:[UIImageView] = [] 

override func viewDidLoad() { 
    super.viewDidLoad() 
    configurePageControl() 

    scrollView.pagingEnabled = true 
    scrollView.showsHorizontalScrollIndicator = false 
    scrollView.delegate = self 

    for image in imageArray { 
     var imageView = UIImageView(image: image) 
     scrollView.addSubview(imageView) 
     imageViews.append(imageView) 
    } 
} 

override func viewDidLayoutSubviews() { 
    super.viewDidLayoutSubviews() 

    for (index,imageView) in imageViews.enumerate() { 
     imageView.frame = CGRectMake(CGFloat(index)*scrollView.frame.size.width, 0, scrollView.frame.size.width, 160) 
    } 
    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width*3, scrollView.frame.size.height) 
}