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在我的Swift應用程序中，我想將後置攝像頭指向對象，然後單擊按鈕。在我的視圖控制器中，我試圖拿起編程放置按鈕的UIButton按鈕，放置在cameraOverlayView上。UIButton不會在ImageView中調用處理程序函數
我不需要拍照 - 我只是用相機指向物體，然後點擊按鈕。
編譯爲iPhone。我似乎要麼攝像頭工作，要麼按鈕，但不能同時進行。 imagePicker坐在按鈕上並隱藏它。任何人都可以建議如何讓按鈕和imagePicker一起工作？提前致謝。
import UIKit
import MobileCoreServices
class FirstViewController: UIViewController {
@IBOutlet weak var imageView: UIImageView!
let imagePicker: UIImagePickerController! = UIImagePickerController()
func noCamera() {
let alertVC = UIAlertController(
title: "No Camera",
message: "Sorry, this device has no camera",
preferredStyle: .Alert)
let okAction = UIAlertAction(
title: "OK",
style:.Default,
handler: nil)
alertVC.addAction(okAction)
presentViewController(
alertVC,
animated: true,
completion: nil)
}
// THIS IS THE FUNCTION I'M TRYING TO CALL
func buttonAction(sender: UIButton!) {
if sender.tag == 1 {
print("Button tapped")
let alertVC = UIAlertController(
title: "Button pressed",
message: "Button pressed",
preferredStyle: .Alert)
let okAction = UIAlertAction(
title: "OK",
style:.Default,
handler: nil)
alertVC.addAction(okAction)
presentViewController(
alertVC,
animated: true,
completion: nil)
}
}
@IBAction func useCamera(sender: UIButton) { // A SEPARATE STORYBOARD BUTTON IS USED TO CALL THIS INITIALLY
if (UIImagePickerController.isSourceTypeAvailable(.Camera)) {
if UIImagePickerController.availableCaptureModesForCameraDevice(.Rear) != nil {
//Create camera overlay
let pickerFrame = CGRectMake(
0,
UIApplication.sharedApplication().statusBarFrame.size.height,
imagePicker.view.bounds.width,
imagePicker.view.bounds.height - imagePicker.navigationBar.bounds.size.height - imagePicker.toolbar.bounds.size.height)
// Sights
let sightDiam: CGFloat = 50 // size of sights
let sightFrame = CGRectMake(
pickerFrame.width/2 - sightDiam/2,
pickerFrame.height/2 - sightDiam/2,
sightDiam,
sightDiam)
UIGraphicsBeginImageContext(pickerFrame.size)
let context = UIGraphicsGetCurrentContext()
CGContextSaveGState(context)
CGContextSetLineWidth(context, 2) // linewidth
CGContextSetStrokeColorWithColor(context, UIColor.yellowColor().CGColor) // colour
// Outer circle
CGContextStrokeEllipseInRect(context, sightFrame)
// Inner dot
CGContextStrokeEllipseInRect(context, CGRectMake(sightFrame.minX + sightFrame.width/2-1,sightFrame.minY + sightFrame.height/2-1,2,2))
// Top tick
CGContextMoveToPoint(context, sightFrame.minX + sightFrame.width/2, sightFrame.minY + 7)
CGContextAddLineToPoint(context, sightFrame.minX + sightFrame.width/2, sightFrame.minY - 7)
// Bottom tick
CGContextMoveToPoint(context, sightFrame.origin.x + sightFrame.width/2, sightFrame.minY + sightFrame.size.height+7)
CGContextAddLineToPoint(context, sightFrame.origin.x + sightFrame.width/2, sightFrame.minY + sightFrame.size.height-7)
// Left tick
CGContextMoveToPoint(context, sightFrame.minX-7, sightFrame.minY + sightFrame.height/2)
CGContextAddLineToPoint(context, sightFrame.minX+7, sightFrame.minY + sightFrame.height/2)
// Right tick
CGContextMoveToPoint(context, sightFrame.minX + sightFrame.width-7, sightFrame.minY + sightFrame.height/2)
CGContextAddLineToPoint(context, sightFrame.minX + sightFrame.width+7, sightFrame.minY + sightFrame.height/2)
// Draw
CGContextStrokePath(context)
CGContextRestoreGState(context)
let overlayImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext();
let overlayView = UIImageView(frame: pickerFrame)
overlayView.image = overlayImage
let screenSize = UIScreen.mainScreen().bounds.size
let aspectRatio:CGFloat = 4.0/3.0
let scale = screenSize.height/screenSize.width * aspectRatio
imagePicker.allowsEditing = false
imagePicker.sourceType = .Camera
imagePicker.cameraCaptureMode = .Photo
imagePicker.modalPresentationStyle = .FullScreen
imagePicker.showsCameraControls = false // keep off
imagePicker.cameraOverlayView = overlayView
imagePicker.cameraViewTransform = CGAffineTransformMakeScale(scale, scale);
overlayView.userInteractionEnabled = true
// Add Button (programatically)
let buttonBorder: CGFloat = 30 // size of button
let buttonHeight: CGFloat = 50 // height of button
var button: UIButton = UIButton(type: UIButtonType.System) as UIButton
button.frame = CGRectMake(
buttonBorder,
screenSize.height - buttonBorder - buttonHeight,
screenSize.width - (buttonBorder * 2),
buttonHeight)
button.backgroundColor = UIColor.yellowColor()
button.setTitle("Aim at object", forState: UIControlState.Normal)
button.tag = 1
button.addTarget(self, action: "buttonAction:", forControlEvents: .TouchUpInside)
button.userInteractionEnabled = true
overlayView.addSubview(button)
overlayView.bringSubviewToFront(button)
button.userInteractionEnabled = true
presentViewController(imagePicker, animated: false,
completion: {})
// I WANTED THE BUTTON CLICK ABOVE TO CALL 'buttonAction'
// BUT THE BUTTON NEVER GETS ACTIVATED - WHY NOT?
} else {
noCamera() // no rear camera
}
} else {
noCamera() // no camera
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
有很好的建議已經在後 - UIButton not calling event in imageView但這並沒有幫助我。由於
你沒有提到'UIImagePickerController'' imagePicker'。在我看來你在添加按鈕之前呈現'imagePicker'，所以這可能與它有關。 – tktsubota
感謝TroyT - 你的意思是我應該把imagePicker定義（目前在代碼的頂部）放入useCamera函數中，但是首先定義按鈕？ – Steve
問題可能不是圖像視圖，它可能是圖像選擇器。嘗試創建一個新的簡單的應用程序，只有一個圖像視圖和一個按鈕，並看看是否可以點擊按鈕。 – tktsubota