我在两天前运行良好的某些代码上遇到错误。错误是:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType extent]: unrecognized selector sent to instance 0x1bc8f0'
它指向main.m上的这一行:
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
使用日志查看我的代码到达的位置,似乎此行抛出了错误:
greySave = [context createCGImage:greyscaleImage fromRect:[greyscaleImage extent]];
greySave是一个CGImageRef,在我的视图控制器开始时声明。抓取CIImage输出并将其转换为CGImageRef进行保存很简单:
desaturate = [CIFilter filterWithName:@"CIColorMonochrome" keysAndValues:kCIInputImageKey, colourSave, @"inputIntensity", [NSNumber numberWithFloat:0.00], nil];
greyscaleImage = [desaturate valueForKey:@"outputImage"];
greySave = [context createCGImage:greyscaleImage fromRect:[greyscaleImage extent]];
我认为(虽然不明白为什么)可能引起问题的唯一更改是添加了一个额外的条件语句,该语句将应用第二个过滤器是用户希望这样做:
if ([_alphaButtonSavedState isEqualToString:@"ON"]) {
NSLog(@"user does want alpha on greyscale");
//user wants alpha mask also
} else {
NSLog(@"user does not want alpha on greyscale");
//convert to CGImage for saving
greySave = [context createCGImage:greyscaleImage fromRect:[greyscaleImage extent]];
NSLog(@"greySave cgimage created");
//save the grey image
[library writeImageToSavedPhotosAlbum:greySave metadata:[greyscaleImage properties] completionBlock:^(NSURL *assetURL, NSError *error){
if (error) {
NSLog(@"ERROR in greyscale save: %@", error);
} else
{
NSLog(@"SUCCESS in greyscale save");
//in here we'll put a nice animation or something
//CGImageRelease(greyscaleImage);
}
}];
任何想法为什么会这样?
谢谢。
编辑:
这是完整的代码块,以防万一。
[stillImage captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer]; //get the raw image data from the session
UIImage *startImage = [[UIImage alloc] initWithData:imageData]; //create a UIImage from that image data, let's us work with it
//resizing of image to take place before anything else
UIImage *image = [UIImage imageWithImage:startImage scaledToSize:_exportSSize]; //scale the image so it's shortest side is the size given in prefs
NSLog(@"image width post scale: %g", image.size.width);
NSLog(@"image height post scale is: %g", image.size.height);
//change the context to render using cpu, so on app exit renders get completed
context = [CIContext contextWithOptions: [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:kCIContextUseSoftwareRenderer]];
//new crop testing - not using CIImage - seems to work, just need to sort out crop region
CGRect cropRect = CGRectMake(0, 0, _exportSize, _exportSize);
UIImage *cropper = [self imageByCropping:image toRect:cropRect];
//the colour image is always saved so create a CGImage to save later
colourSave = [cropper CGImage];
NSLog(@"coloursave image created");
//now we convert and create CGImages based upon chosen export options
if ([_greyButtonSavedState isEqualToString:@"ON"]) {
NSLog(@"inside the greyscale conditional");
//user wants greyscale image
//create a CIMonochrome filter
desaturate = [CIFilter filterWithName:@"CIColorMonochrome" keysAndValues:kCIInputImageKey, colourSave, @"inputIntensity", [NSNumber numberWithFloat:0.00], nil];
NSLog(@"desat ci filter created");
//get the output
greyscaleImage = [desaturate valueForKey:@"outputImage"];
NSLog(@"dest output image created");
//if the user wants to add the alpha
if ([_alphaButtonSavedState isEqualToString:@"ON"]) {
NSLog(@"user does want alpha on greyscale");
//user wants alpha mask also
} else {
NSLog(@"user does not want alpha on greyscale");
//convert to CGImage for saving
greySave = [context createCGImage:greyscaleImage fromRect:[greyscaleImage extent]];
NSLog(@"greySave cgimage created");
//save the grey image
[library writeImageToSavedPhotosAlbum:greySave metadata:[greyscaleImage properties] completionBlock:^(NSURL *assetURL, NSError *error){
if (error) {
NSLog(@"ERROR in greyscale save: %@", error);
} else
{
NSLog(@"SUCCESS in greyscale save");
//in here we'll put a nice animation or something
}
}];
}
}
-这里还有两个条件,目前都为空
-然后保存colourSave图像,效果很好。
-然后方法结束。
还有一件事,这就是我裁剪图像的方式。从以下方法返回的图像是我从中创建CIImage的内容:
-(UIImage *)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect
{
CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage],rect);
UIImage *cropped = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return cropped;
}
最佳答案
添加答案以防万一。
我正在将UIImage传递到CIFilter中,这导致了问题。将UIImage转换为CIImage并将其传入可以解决该问题。
关于ios - NSInvalidArgument错误-CIImage的CGImageRef,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/10564853/