在主线程外创建UIImage

Question

我使用下面的代码在后台线程中创建一个UIImage，然后将此图像设置为主线程上我的视图的图像。偶尔，我得到一个糟糕的访问错误。我想知道我是否应该在后台线程中创建UIImage。有什么想法吗？

CGImageRef imageRef =
    CGImageCreate(serverInit.rfbWidth,serverInit.rfbHeight,bitsPerComponent,bitsPerPixel,bytesPerRow,colorSpaceRef,bitmapInfo,provider,NULL,NO,renderingIntent);

    screenImage = [UIImage imageWithCGImage:imageRef];

    CFRelease(imageRef);

    [view performSelector:@selector(replaceImage:) onThread:[NSThread mainThread] withObject:screenImage waitUntilDone:NO];

Answer 1

尝试使用它，它可以防止发布screenImage

CGImageRef imageRef = CGImageCreate(serverInit.rfbWidth,serverInit.rfbHeight,bitsPerComponent,bitsPerPixel,bytesPerRow,colorSpaceRef,bitmapInfo,provider,NULL,NO,renderingIntent);
    screenImage = [UIImage imageWithCGImage:imageRef];
    CFRelease(imageRef);
dispatch_sync(dispatch_get_main_queue(), ^{
   [view replaceImage:screenImage];
});