我是XCode和Swift的新手...但是，我想尝试一下...我想拥有两个可拖动的图像，如果它们发生碰撞，则会弹出一个警报窗口...我在下面附加了代码。 ..当我运行代码时，收到以下警告：
UIPanRecogniserSwift [10047：300286]警告：尝试呈现在已经呈现的内容上
我不确定如何解决此问题。已经尝试将if语句放置在代码中的不同位置，但没有成功。
是否还可以访问警报窗口中的“重置”按钮以获取命令（即，如果用户按下“重置”，则将图片1放置到x，y位置）？
import UIKit
class ViewController: UIViewController {
@IBOutlet var yellowBox: UIView!
@IBOutlet var Dice: UIImageView!
@IBAction func panYellowView(sender: UIPanGestureRecognizer) {
let translation = sender.translationInView(self.view)
sender.view!.center = CGPoint(x: sender.view!.center.x + translation.x, y: sender.view!.center.y + translation.y)
sender.setTranslation(CGPointZero, inView: self.view)
self.ifCollided()
}
/*func showAlert() {
let alertController = UIAlertController(title: "Collided", message: "You have collided",preferredStyle: UIAlertControllerStyle.Alert)
alertController .addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
alertController .addAction(UIAlertAction(title: "Reset", style: .Cancel, handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)
}*/
@IBAction func panDiceView(sender: UIPanGestureRecognizer) {
let translation = sender.translationInView(self.view)
sender.view!.center = CGPoint(x: sender.view!.center.x + translation.x, y: sender.view!.center.y + translation.y)
sender.setTranslation(CGPointZero, inView: self.view)
}
@IBAction func ifCollided() {
if CGRectIntersectsRect(yellowBox.frame, Dice.frame){
//showAlert()
let alertController = UIAlertController(title: "Collided", message: "You have collided",preferredStyle: UIAlertControllerStyle.Alert)
alertController .addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
alertController .addAction(UIAlertAction(title: "Reset", style: .Cancel, handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)
//showAlert()
}
}
override func viewDidLoad() {
super.viewDidLoad()
//self.ifCollided()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
最佳答案
这段代码运行良好，当骰子移动时您没有检查ifCollided()。此代码在我的Xcode 7.3.1 iOS 9.3上正常工作
import UIKit
class ViewController: UIViewController {
@IBOutlet var yellowBox: UIView!
@IBOutlet var Dice: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
Dice.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.panDiceView(_:))))
yellowBox.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.panYellowView(_:))))
}
func panYellowView(sender: UIPanGestureRecognizer)
{
let translation = sender.translationInView(self.view)
sender.view!.center = CGPoint(x: sender.view!.center.x + translation.x, y: sender.view!.center.y + translation.y)
sender.setTranslation(CGPointZero, inView: self.view)
self.ifCollided()
}
func showAlert()
{
let alertController = UIAlertController(title: "Collided", message: "You have collided",preferredStyle: UIAlertControllerStyle.Alert)
alertController .addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
alertController .addAction(UIAlertAction(title: "Reset", style: .Cancel, handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)
}
func panDiceView(sender: UIPanGestureRecognizer)
{
let translation = sender.translationInView(self.view)
sender.view!.center = CGPoint(x: sender.view!.center.x + translation.x, y: sender.view!.center.y + translation.y)
sender.setTranslation(CGPointZero, inView: self.view)
self.ifCollided()
}
@IBAction func ifCollided()
{
if CGRectIntersectsRect(yellowBox.frame, Dice.frame){
showAlert()
}
}
}
尝试使用
performSelector调用方法self.performSelector(#selector(self.showAlert))