Ios 将Objective-C代码转换为Swift:可以省略释放调用吗?
我们需要将下面的代码从Objective-C转换为Swift 问题: 有几个函数调用来释放对象,例如,Ios 将Objective-C代码转换为Swift:可以省略释放调用吗?,ios,objective-c,swift,core-graphics,core-media,Ios,Objective C,Swift,Core Graphics,Core Media,我们需要将下面的代码从Objective-C转换为Swift 问题: 有几个函数调用来释放对象,例如,cgmagerelease(newImage)。假设Swift版本不需要模拟,因为所有的内存管理都是自动的,这样安全吗?还是您也需要在Swift中释放内存 目标C代码: CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(imageSampleBuffer); CVPixelBufferLockBaseAddress(image
cgmagerelease(newImage)
。假设Swift版本不需要模拟,因为所有的内存管理都是自动的,这样安全吗?还是您也需要在Swift中释放内存
目标C代码:
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(imageSampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer,0);
uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
CGImageRef newImage = CGBitmapContextCreateImage(newContext); CGContextRelease(newContext);
CGColorSpaceRelease(colorSpace);
UIImage *image= [UIImage imageWithCGImage:newImage scale:1.0 orientation:orientation];
CGImageRelease(newImage);
迄今为止的Swift版本:
private func turnBufferToPNGImage(imageSampleBuffer: CMSampleBufferRef, scale: CGFloat) -> UIImage {
let imageBuffer = CMSampleBufferGetImageBuffer(imageSampleBuffer)
// Lock base address
CVPixelBufferLockBaseAddress(imageBuffer, 0)
// Set properties for CGBitmapContext
let pixelData = CVPixelBufferGetBaseAddress(imageBuffer)
let width = CVPixelBufferGetWidth(imageBuffer)
let height = CVPixelBufferGetHeight(imageBuffer)
let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer)
let colorSpace = CGColorSpaceCreateDeviceRGB()
// Create CGBitmapContext
let newContext = CGBitmapContextCreate(pixelData, width, height, 8, bytesPerRow, colorSpace, CGImageAlphaInfo.PremultipliedFirst.rawValue)
// Create image from context
let rawImage = CGBitmapContextCreateImage(newContext)!
let newImage = UIImage(CGImage: rawImage, scale: scale, orientation: .Up)
// Unlock base address
CVPixelBufferUnlockBaseAddress(imageBuffer,0)
// Return image
return newImage
}
根据文件:
核心基础类型自动导入成熟的SWIFT类。无论在哪里提供内存管理注解,Swift都会自动管理核心基础对象的内存,包括您自己实例化
的核心基础对象。因此,您可以省略这些调用不需要释放核心基础对象,因为 苹果表示:
核心基础CFTyPrEF类型完全映射到任何对象 类型
及从注释的API返回的核心基础对象是自动的 在Swift中管理的内存无需调用CFRetain, CFRelease或CFAutorelease可自行运行
文件