各画像を.PNGファイルとして配列に保存しようとしています（Retina Mac dpiの問題のために拡大せずに、適切なサイズとしても）、解決策が見つからないようです。How to save PNG file from NSImage (retina issues)の解決策はどれもうまくいかないようです。私はそれぞれを試しましたが、それぞれが72x72ファイルをretina .etcに144x144として保存します。
より具体的には、NSImage カテゴリを探しています (はい、Mac 環境で作業しています)
私はユーザーにそれらを保存するディレクトリを選択させ、次のように配列から画像の保存を実行させようとしています:
- (IBAction)saveImages:(id)sender {
// Prepare Images that are checked and put them in an array
[self prepareImages];
if ([preparedImages count] == 0) {
NSLog(@"We have no preparedImages to save!");
NSAlert *alert = [[NSAlert alloc] init];
[alert setAlertStyle:NSInformationalAlertStyle];
[alert setMessageText:NSLocalizedString(@"Error", @"Save Images Error Text")];
[alert setInformativeText:NSLocalizedString(@"You have not selected any images to create.", @"Save Images Error Informative Text")];
[alert beginSheetModalForWindow:self.window
modalDelegate:self
didEndSelector:@selector(testDatabaseConnectionDidEnd:returnCode:
contextInfo:)
contextInfo:nil];
return;
} else {
NSLog(@"We have prepared %lu images.", (unsigned long)[preparedImages count]);
}
// Save Dialog
// Create a File Open Dialog class.
//NSOpenPanel* openDlg = [NSOpenPanel openPanel];
NSSavePanel *panel = [NSSavePanel savePanel];
// Set array of file types
NSArray *fileTypesArray;
fileTypesArray = [NSArray arrayWithObjects:@"jpg", @"gif", @"png", nil];
// Enable options in the dialog.
//[openDlg setCanChooseFiles:YES];
//[openDlg setAllowedFileTypes:fileTypesArray];
//[openDlg setAllowsMultipleSelection:TRUE];
[panel setNameFieldStringValue:@"Images.png"];
[panel setDirectoryURL:directoryPath];
// Display the dialog box. If the OK pressed,
// process the files.
[panel beginWithCompletionHandler:^(NSInteger result) {
if (result == NSFileHandlingPanelOKButton) {
NSLog(@"OK Button!");
// create a file manager and grab the save panel's returned URL
NSFileManager *manager = [NSFileManager defaultManager];
directoryPath = [panel URL];
[[self directoryLabel] setStringValue:[NSString stringWithFormat:@"%@", directoryPath]];
// then copy a previous file to the new location
// copy item at URL was self.myURL
// copy images that are created from array to this path
for (NSImage *image in preparedImages) {
#warning Fix Copy Item At URL to copy image from preparedImages array to save each one
NSString *imageName = image.name;
NSString *imagePath = [[directoryPath absoluteString] stringByAppendingPathComponent:imageName];
//[manager copyItemAtURL:nil toURL:directoryPath error:nil];
NSLog(@"Trying to write IMAGE: %@ to URL: %@", imageName, imagePath);
//[image writePNGToURL:[NSURL URLWithString:imagePath] outputSizeInPixels:image.size error:nil];
[self saveImage:image atPath:imagePath];
}
//[manager copyItemAtURL:nil toURL:directoryPath error:nil];
}
}];
[preparedImages removeAllObjects];
return;
}
1 人のユーザーがこの NSImage カテゴリを使用して回答を試みましたが、ファイルや PNG は作成されませんでした。
@interface NSImage (SSWPNGAdditions)
- (BOOL)writePNGToURL:(NSURL*)URL outputSizeInPixels:(NSSize)outputSizePx error:(NSError*__autoreleasing*)error;
@end
@implementation NSImage (SSWPNGAdditions)
- (BOOL)writePNGToURL:(NSURL*)URL outputSizeInPixels:(NSSize)outputSizePx error:(NSError*__autoreleasing*)error
{
BOOL result = YES;
NSImage* scalingImage = [NSImage imageWithSize:[self size] flipped:[self isFlipped] drawingHandler:^BOOL(NSRect dstRect) {
[self drawAtPoint:NSMakePoint(0.0, 0.0) fromRect:dstRect operation:NSCompositeSourceOver fraction:1.0];
return YES;
}];
NSRect proposedRect = NSMakeRect(0.0, 0.0, outputSizePx.width, outputSizePx.height);
CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
CGContextRef cgContext = CGBitmapContextCreate(NULL, proposedRect.size.width, proposedRect.size.height, 8, 4*proposedRect.size.width, colorSpace, kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(colorSpace);
NSGraphicsContext* context = [NSGraphicsContext graphicsContextWithGraphicsPort:cgContext flipped:NO];
CGContextRelease(cgContext);
CGImageRef cgImage = [scalingImage CGImageForProposedRect:&proposedRect context:context hints:nil];
CGImageDestinationRef destination = CGImageDestinationCreateWithURL((__bridge CFURLRef)(URL), kUTTypePNG, 1, NULL);
CGImageDestinationAddImage(destination, cgImage, nil);
if(!CGImageDestinationFinalize(destination))
{
NSDictionary* details = @{NSLocalizedDescriptionKey:@"Error writing PNG image"};
[details setValue:@"ran out of money" forKey:NSLocalizedDescriptionKey];
*error = [NSError errorWithDomain:@"SSWPNGAdditionsErrorDomain" code:10 userInfo:details];
result = NO;
}
CFRelease(destination);
return result;
}
@end