[英]horizontally scaling a background color image
我是iOS和Swift的新手。 我正在嘗試為幻燈片右添加效果的背景圖像。 我希望該圖像在任何方向都可粘貼在屏幕的右側。 圖像將始終為設定的尺寸(現在為(382x145px)。如何調整橫向方向,以使圖像保持在右側。
這是我的自定義視圖單元類。
class CustomRouteViewCell: UITableViewCell {
@IBOutlet var downImage: UIImageView!
@IBOutlet var downTime: UILabel!
@IBOutlet weak var leadingSpaceConstraint: NSLayoutConstraint!
@IBOutlet weak var trailingSpaceConstraint: NSLayoutConstraint!
@IBOutlet var locationTitle: UILabel!
@IBOutlet weak var panView: UIView!
@IBOutlet var timerLabel: UILabel!
var indexRow: Int = 0
var timeInterval: Int = 0
override func awakeFromNib() {
super.awakeFromNib()
self.selectedBackgroundView = nil
var img = UIImage(named: "tableSwipeArrow.png")!
self.panView.backgroundColor = UIColor(patternImage: img)
if self.respondsToSelector(Selector("setLayoutMargins:")) {
layoutMargins = UIEdgeInsetsZero
}
if self.respondsToSelector(Selector("setPreservesSuperviewLayoutMargins:")) {
preservesSuperviewLayoutMargins = false
}
var panGestureRecognizer = UIPanGestureRecognizer(target: self, action: "handlePanGesture:")
panGestureRecognizer.delegate = self
addGestureRecognizer(panGestureRecognizer)
}
func handlePanGesture(recognizer: UIPanGestureRecognizer) {
switch(recognizer.state) {
case UIGestureRecognizerState.Changed:
var translation = recognizer.translationInView(recognizer.view!)
var little = CGFloat(trailingSpaceConstraint.constant + translation.x * -1)
trailingSpaceConstraint.constant = fmax(0, little)
leadingSpaceConstraint.constant = fmin(0, leadingSpaceConstraint.constant + translation.x)
recognizer.setTranslation(CGPointZero, inView: recognizer.view!)
timeInterval = Int(trailingSpaceConstraint.constant / 30) * 5
timerLabel.text! = "\(timeInterval)"
case UIGestureRecognizerState.Ended, UIGestureRecognizerState.Cancelled:
var refreshAlert = Alarm.getReminderView(self.timeInterval, view: self.parentViewController!.view)
self.parentViewController?.presentViewController(refreshAlert, animated: true, completion: nil)
leadingSpaceConstraint.constant = 0
trailingSpaceConstraint.constant = 0
UIView.animateWithDuration(0.25, animations: { () -> Void in
self.layoutIfNeeded()
})
default:
trailingSpaceConstraint.constant = 0
leadingSpaceConstraint.constant = 0
}
}
}
extension CustomRouteViewCell: UIGestureRecognizerDelegate
{
override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
if gestureRecognizer.isKindOfClass(UIPanGestureRecognizer) {
var velocity = (gestureRecognizer as! UIPanGestureRecognizer).velocityInView(gestureRecognizer.view!)
return fabs(velocity.x) > fabs(velocity.y)
}
return true;
}
}
使用自動布局鏈接圖像的位置。 您可以將背景圖片的尾部與容器視圖連接起來。
按住圖片控件,然后將尾隨屬性與主視圖鏈接
只需將常數調整為0。
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