Swift如何为图像定义内存？ 继续出现错误：EXC_BAD_ACCESS

如何解决Swift如何为图像定义内存？ 继续出现错误：EXC_BAD_ACCESS

我正在构建图像，然后尝试对其进行更新。该版本可以正常运行并显示正常，但是当我尝试对其进行更新时，我得到一个错误：线程1：EXC_BAD_ACCESS（code = 1，address = 0x105d14a44）与此：

self.pixelBuffer[pixelIndex] = .green

如果我注释掉该行，则图像在viewDidLoad中显示为原始构建（全蓝色）。

以下是详细信息：

在ViewController中：

var pixelBuffer : UnsafeMutablePointer<RGBA32>!

在viewDidLoad中：

    let colorSpace       = CGColorSpaceCreateDeviceRGB()
    let bytesPerPixel    = 4
    let bitsPerComponent = 8
    let bytesPerRow      = bytesPerPixel * self.cols // width
    let bitmapInfo       = RGBA32.bitmapInfo
    let miniImageContext = CGContext(data: nil,width: self.cols,height: self.rows,bitsPerComponent: bitsPerComponent,bytesPerRow: bytesPerRow,space: colorSpace,bitmapInfo: bitmapInfo)
    let buffer = miniImageContext!.data
    self.pixelBuffer = buffer!.bindMemory(to: RGBA32.self,capacity: self.cols * self.rows)
    
    var pixelIndex = 1

然后循环访问100行和列：

        var pixelIndex = 1
        for row in 0..<self.rows {
            for i in 0..<self.cols {
            
                self.pixelBuffer[pixelIndex] = .blue  # This works fine
            
                pixelIndex += 1
            }
        }

然后在循环之后：

    let cgImage = miniImageContext!.makeImage()
    let miniImage = UIImage(cgImage: cgImage!)
    // display the image in the View
    miniImageView.image = miniImage

然后在viewWillAppear中循环播放，以更改蓝色图像，例如：

    guard var tiles = mapFile.tiles else {return}
    
    //MARK: Put mapFile tiles on Image
    for tile in tiles {
        let thisRow = tile.row
        let thisCol = tile.col

        var pixelIndex = 1
        if (thisRow! <= 1) {
            pixelIndex = 1 + (thisCol ?? 1)
        }
        else { //if (thisRow > 1) {
            pixelIndex = ((thisRow ?? 1) * self.cols) - (self.cols) + (thisCol ?? 1)
        }

        self.pixelBuffer[pixelIndex] = .green  # This produces the error

    }

我试图简化代码。例如，将其设置为.green的行将是一个切换案例，可根据tile变量中的属性将其设置为不同的颜色。

RGBA32是这样的：

struct RGBA32：等于{ 私人var颜色：UInt32

    init(red: UInt8,green: UInt8,blue: UInt8,alpha: UInt8) {
    color = (UInt32(red) << 24) | (UInt32(green) << 16) | (UInt32(blue) << 8) | (UInt32(alpha) << 0)
}

static let bitmapInfo = CGImageAlphaInfo.premultipliedLast.rawValue | CGBitmapInfo.byteOrder32Little.rawValue

static func ==(lhs: RGBA32,rhs: RGBA32) -> Bool {
    return lhs.color == rhs.color
}

static let black = RGBA32(red: 0,green: 0,blue: 0,alpha: 255)
static let red   = RGBA32(red: 255,alpha: 255)
static let green = RGBA32(red: 24,green: 183,blue: 3,alpha: 255)
static let darkgreen = RGBA32(red: 70,green: 105,blue: 35,alpha: 255)
static let blue  = RGBA32(red: 0,green: 127,blue: 255,alpha: 255)
static let lightblue = RGBA32(red: 33,green: 255,alpha: 255)
static let brown = RGBA32(red: 127,green: 63,alpha: 255)

}