[英]How to resize an UIImageView (swift)
我是swift的初學者,我無法調整UIImageView的大小。
這是我目前的布局:
我想要的是調整圖像大小占據屏幕寬度的一半(每行2個圖像)。
這是我的故事板:
這是在我的控制器中繪制集合視圖的函數:
func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -> UICollectionViewCell! {
var cell : MenuInspirationCellView = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as MenuInspirationCellView
cell.imageView.layer.borderWidth = 2
cell.imageView.layer.borderColor = UIColor.yellowColor().CGColor
//This is my first approach trying to modify the frame :
cell.imageView.frame = CGRectMake(0,0, self.view.bounds.width / 2,v120)
var cellImage : UIImage = UIImage(data: NSData(contentsOfURL: NSURL(string: images[indexPath.row])))
cell.imageView.image = cellImage;
//This is my second approach (based on http://www.snip2code.com/Snippet/89236/Resize-Image-in-iOS-Swift) :
// to resize an image to dimension 52x52
//var newSize:CGSize = CGSize(width: 52,height: 52)
//let rect = CGRectMake(0,0, newSize.width, newSize.height)
//UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
// image is a variable of type UIImage
//cellImage.drawInRect(rect)
//let newImage = UIGraphicsGetImageFromCurrentImageContext()
//UIGraphicsEndImageContext()
// resized image is stored in constant newImage
//cell.imageView.image = newImage;
//This is my thrid approach (based on https://gist.github.com/hcatlin/180e81cd961573e3c54d, of course i added his functions but I don't show them here for the sake of readability) :
//cell.imageView.image = self.RBSquareImageTo(cellImage, size: CGSize(width: 80, height: 80))
return cell
}
任何導致排除這一點?
單元格的大小由您的UICollectionViewLayout
對象決定,在您的情況下,這是一個UICollectionViewFlowLayout
。 如果您希望所有單元格大小相同,則可以在布局本身上配置屬性; itemSize
和minimumInterimSpacing
可以解決這個問題。 或者,如果您希望單元格的大小不同,例如,根據每個包含的圖像或其他內容,您需要集合視圖委托來實現UICollectionViewDelegateFlowLayout
方法:
optional func collectionView(collectionView: UICollectionView!, layout collectionViewLayout: UICollectionViewLayout!, sizeForItemAtIndexPath indexPath: NSIndexPath!) -> CGSize
返回每個單元格所需的大小。
迅速:
func imageResize(imageObj:UIImage, sizeChange:CGSize)-> UIImage {
let hasAlpha = false
let scale: CGFloat = 0.0 // Automatically use scale factor of main screen
UIGraphicsBeginImageContextWithOptions(sizeChange, !hasAlpha, scale)
imageObj.drawInRect(CGRect(origin: CGPointZero, size: sizeChange))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext() // !!!
return scaledImage
}
按照本教程,您可以調整UIImage的大小,在完全描述的教程中。 圖像在swift ios8中調整大小
func imageResize (imageObj:UIImage, sizeChange:CGSize)-> UIImage{
let hasAlpha = false
let scale: CGFloat = 0.0 // Automatically use scale factor of main screen
UIGraphicsBeginImageContextWithOptions(sizeChange, !hasAlpha, scale)
imageObj.drawInRect(CGRect(origin: CGPointZero, size: sizeChange))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
return scaledImage
}
在這里,您還可以看到許多關於Swift語言的教程。訪問此處iPhone和iPad應用程序開發幫助世界
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