问题描述
我在使用 UIImageView 和 iOS14.5(可能更早)时遇到了一个奇怪的错误。像将生成的图像分配给 UIImageView 这样简单的事情是行不通的。该图像已分配给它的内存,我可以看到它的大小非零,并且在 XCode 中调试视图层次结构时我可以看到图像是正确的。
为什么 UIImageView 拒绝渲染使用 UIImage(ciImage: ciImage) 初始值设定项创建的 UIImage?
func processFrame(arFrame: ARFrame) {
let orientation = DeviceOrientationInfo.deviceOrientation
let transform = arFrame.displayTransform(for: orientation,viewportSize: viewportSize).inverted()
let ciImage = CIImage(cvPixelBuffer: arFrame.capturedImage).transformed(by: transform)
let uiImage = UIImage(ciImage: ciImage)
//100% does NOT render.
// Using view debugger does render the image in a side panel when debug image view is selected
DispatchQueue.main.async { [weak self,uiImage] in
guard let debugView = self?.debugView else { return }
self?.savedImage = uiImage //Displays a blank UIImageView.
}
// Does render the UIImage as expected
let context = CIContext(options: nil)
if let cgImage = context.createCGImage(ciImage,from: ciImage.extent) {
let uiImage = UIImage(cgImage: cgImage)
DispatchQueue.main.async { [weak self,uiImage] in
guard let debugView = self?.debugView else { return }
debugView.image = uiImage
}
}
}
解决方法
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