的UIImage切片造成死机

Question

我使用下面的代码来削减图像的瓷砖，并把每一个集合中：

import UIKit 

extension UIImage { 
    func image(withRotation radians: CGFloat) -> UIImage { 
    let cgImage = self.cgImage! 
    let LARGEST_SIZE = CGFloat(max(self.size.width, self.size.height)) 
    let context = CGContext.init(data: nil, width:Int(LARGEST_SIZE), height:Int(LARGEST_SIZE), bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: 0, space: cgImage.colorSpace!, bitmapInfo: cgImage.bitmapInfo.rawValue)! 

    var drawRect = CGRect.zero 
    drawRect.size = self.size 
    let drawOrigin = CGPoint(x: (LARGEST_SIZE - self.size.width) * 0.5,y: (LARGEST_SIZE - self.size.height) * 0.5) 
    drawRect.origin = drawOrigin 
    var tf = CGAffineTransform.identity 
    tf = tf.translatedBy(x: LARGEST_SIZE * 0.5, y: LARGEST_SIZE * 0.5) 
    tf = tf.rotated(by: CGFloat(radians)) 
    tf = tf.translatedBy(x: LARGEST_SIZE * -0.5, y: LARGEST_SIZE * -0.5) 
    context.concatenate(tf) 
    context.draw(cgImage, in: drawRect) 
    var rotatedImage = context.makeImage()! 

    drawRect = drawRect.applying(tf) 

    rotatedImage = rotatedImage.cropping(to: drawRect)! 
    let resultImage = UIImage(cgImage: rotatedImage) 
    return resultImage 
    } 
} 

class Image { 
    static let shared:Image = Image() 
    var image:UIImage = UIImage(named:"Me")! 
    var images:[UIImage] = [] 


    func shuffle(model:[Int], imageRef:UIImage) { 
    image = imageRef 
    images = self.slice(into: Int(sqrt(Double(model.count)))) 
    } 

    func slice(into howMany: Int) -> [UIImage] { 
    let width: CGFloat 
    let height: CGFloat 

    switch image.imageOrientation { 
    case .left, .leftMirrored: 
     image = image.image(withRotation: (CGFloat)(Double.pi/2 )) 
     break 
    case .right, .rightMirrored: 
     image = image.image(withRotation: (CGFloat)(-Double.pi/2)) 
     break 
    default: 
     break 
    } 
    width = image.size.width 
    height = image.size.height 

    let tileWidth = Int(width/CGFloat(howMany)) 
    let tileHeight = Int(height/CGFloat(howMany)) 

    let scale = Int(image.scale) 
    var images = [UIImage]() 
    let cgImage = image.cgImage! 

    var adjustedHeight = tileHeight 

    var y = 0 
    for row in 0 ..< howMany { 
     if row == (howMany - 1) { 
     adjustedHeight = Int(height) - y 
     } 
     var adjustedWidth = tileWidth 
     var x = 0 
     for column in 0 ..< howMany { 
     if column == (howMany - 1) { 
      adjustedWidth = Int(width) - x 
     } 
     let origin = CGPoint(x: x * scale, y: y * scale) 
     let size = CGSize(width: adjustedWidth * scale, height: adjustedHeight * scale) 
     let tileCgImage = cgImage.cropping(to: CGRect(origin: origin, size: size)) 
     images.append(UIImage(cgImage: tileCgImage!, scale: image.scale, orientation: image.imageOrientation)) 
     x += tileWidth 
     } 
     y += tileHeight 
    } 
    return images 

    } 
} 

在情况下的howmany比15大，我只得到坠毁，机上真实的设备，并带有以下消息： “来自调试器的消息：由于内存问题而终止”

任何人都可以协助？

唯一的原因，我能想出的是，每一次创建的映像采取太多的空间，如在15的情况下将有15^2 =图像225

即使与考虑，我还是想不到一种方式我可以做到这一点不同..

任何人有任何想法？

Answer 1

尝试将代码循环添加到autoreleasepool。

autoreleasepool { 
    if column == (howMany - 1) { 
     adjustedWidth = Int(width) - x 
    } 
    let origin = CGPoint(x: x * scale, y: y * scale) 
    let size = CGSize(width: adjustedWidth * scale, height: adjustedHeight * scale) 
    let tileCgImage = cgImage.cropping(to: CGRect(origin: origin, size: size)) 
    images.append(UIImage(cgImage: tileCgImage!, scale: image.scale, orientation: image.imageOrientation)) 
x += tileWidth 
}