아이폰 OS 메모리 경고

Question

I 사용자 UIGraphicsGetImageFromCurrentImageContext를 사용하여있는 UIImage를 얻을하고 A @IBOutllet 약한 UImageView.image에 할당 0.1 초당 함수의 반복을 발사 타이머. (coverImageView)

var timer:Timer? 

func fireTimer() { 
    timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true, block: { [weak self] _ in 
     self?.lightTheFier() 
    }) 
} 

func invalidateTimer() { 
    timer?.invalidate() 
    timer = nil 
} 

func lightTheFier() { 
    var points = [CGPoint]() 
    for pin in pins { 
     let point = mapView.convert(pin.coordinate, toPointTo: coverImageView) 
     points.append(point) 
    } 
    coverImageView.image = getMaskedImage(points: points, zoomLevel: Int(mapView.zoomLevel())) 
} 

func getOringinalImageFromPath() -> UIImage{ 
    UIGraphicsBeginImageContextWithOptions(coverImageView.bounds.size, false, 0.0) 
    let path = UIBezierPath(rect: coverImageView.bounds) 
    UIColor.black.setFill() 
    path.fill() 
    let image = UIGraphicsGetImageFromCurrentImageContext() 
    UIGraphicsEndImageContext() 
    return image! 
} 

func getMaskImageFromPath(points:[CGPoint], scale:CGFloat) -> UIImage { 
    UIGraphicsBeginImageContextWithOptions(coverImageView.bounds.size, false, 0.0) 
    let radius:CGFloat = 10.0 
    UIColor.blue.setFill() 
    for point in points { 
     let rect = CGRect(x: point.x - (scale*radius/2), y: point.y - (scale*radius/2), width: scale*radius, height: scale*radius) 
     let path = UIBezierPath(ovalIn: rect) 
     path.fill() 
    } 
    let image = UIGraphicsGetImageFromCurrentImageContext() 
    UIGraphicsEndImageContext() 
    return image! 
} 

func getMaskedImage(points:[CGPoint], zoomLevel:Int) -> UIImage{ 
    let orImage = getOringinalImageFromPath().cgImage 
    let maskImage = getMaskImageFromPath(points: points, scale: CGFloat(zoomLevel)).cgImage 
    let mask = CGImage(maskWidth: maskImage!.width, height: maskImage!.height, bitsPerComponent: maskImage!.bitsPerComponent, bitsPerPixel: maskImage!.bitsPerPixel, bytesPerRow: maskImage!.bytesPerRow, provider: maskImage!.dataProvider!, decode: nil, shouldInterpolate: true) 
    let maskRef = orImage?.masking(mask!) 
    let image = UIImage(cgImage: maskRef!) 
    return image 
} 

모든 코드 위의 내용은 테스트 용 ViewController.swift에 있습니다.

함수가 실행되는 동안 메모리가 증가하는 것은 문제가되지 않습니다. 원하는 것은 타이머를 무효로 할 때 메모리를 해제 할 수 있다는 것입니다.

이 문제를 해결하려면 어떻게해야합니까?

Answer 1

당신은 이미지 컨텍스트를 시작하고 있습니다 : UIGraphicsBeginImageContextWithOptions, 그러나 당신은 결코 그것을 끝내지 않을 것입니다. 당신은 당신의 getMaskImageFromPath 및 getOringinalImageFromPath 방법에 UIGraphicsEndImageContext()을 추가해야

func getMaskImageFromPath(points:[CGPoint], scale:CGFloat) -> UIImage { 
    UIGraphicsBeginImageContextWithOptions(coverImageView.bounds.size, false, 0.0) 
    let radius:CGFloat = 10.0 
    UIColor.blue.setFill() 
    for point in points { 
     let rect = CGRect(x: point.x - (scale*radius/2), y: point.y - (scale*radius/2), width: scale*radius, height: scale*radius) 
     let path = UIBezierPath(ovalIn: rect) 
     path.fill() 
    } 
    let image = UIGraphicsGetImageFromCurrentImageContext() 
    UIGraphicsEndImageContext() // Missing this line 
    return image! 
}