我正在开发一个桌面应用程序,它从未显示的NSViewController生成图像。
生成的视图有3 NSImageViews
,它会在创建后更改内容。
我设法将NSViewController's
视图导出到JPG文件,但它永远不会呈现给NSImageView
的图像,它会保留在笔尖中设置的图像。另外,如果我没有将背景颜色设置为视图的图层......我得到一个空的结果。
我在这里缺少什么?我想我需要更新NSViewController的视图......但是我该怎么做呢?我不想展示我的NSViewController。
我的代码:
- (IBAction)doExport:(id)sender {
ExportView *view = [[ExportView alloc] initWithNibName:@"ExportView" bundle:nil];
[view.pic1 setImage:self.pic1.image];
[view.pic2 setImage:self.pic2.image];
[view.pic3 setImage:self.pic3.image];
[view.icon setImage:self.icon.image];
// Hardcoding for test
[view.pic1 setImage:[NSImage imageNamed:@"iPhone 4-Inch Screenshot 1"]];
[view.pic1 setNeedsLayout:YES];
[view.pic1 setNeedsDisplay];
[view.pic1 updateLayer];
// Setup the image to render
NSRect imgRect = view.view.frame;
NSSize imgSize = imgRect.size;
NSBitmapImageRep *rep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
pixelsWide:imgSize.width
pixelsHigh:imgSize.height
bitsPerSample:8
samplesPerPixel:4
hasAlpha:YES
isPlanar:NO
colorSpaceName:NSDeviceRGBColorSpace
bitmapFormat:NSAlphaFirstBitmapFormat
bytesPerRow:0
bitsPerPixel:0];
NSGraphicsContext *g = [NSGraphicsContext graphicsContextWithBitmapImageRep:rep];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:g];
// Set view background color
CALayer *viewLayer = [CALayer layer];
[viewLayer setBackgroundColor:[NSColor clearColor].CGColor];
[view.view setWantsLayer:YES];
[view.view setLayer:viewLayer];
// Render
CGContextRef zCgContextRef = (CGContextRef) [g graphicsPort];
[[view.view layer] renderInContext:zCgContextRef];
// Render pic as well, for test
[view.pic1.layer renderInContext:zCgContextRef];
// Get the Data for the image
NSData *exportedData = [rep representationUsingType:NSJPEGFileType properties:nil];
// Start the savepanel
NSSavePanel *savepanel = [NSSavePanel savePanel];
savepanel.title = @"Save chart";
[savepanel setAllowedFileTypes:[NSArray arrayWithObject:@"jpg"]];
[savepanel beginSheetModalForWindow:self.window completionHandler:^(NSInteger result)
{
if (NSFileHandlingPanelOKButton == result)
{
NSURL* fileURL = [savepanel URL];
if ([fileURL.pathExtension isEqualToString:@""])
fileURL = [fileURL URLByAppendingPathExtension:@"jpg"];
[exportedData writeToURL:fileURL atomically:YES];
}
}];
}
答案 0 :(得分:1)
我以一种非常丑陋的方式解决了它。基本上我所做的是将视图添加到contentView
并立即将setHidden
设置为YES
。这将初始化视图。现在我改变了Nib视图的内容。
在将数据呈现到NSData
时,我将setHidden
更改为NO
,生成NSData
,然后删除该视图。
最终结果(没有漂亮的代码:():
- (IBAction)doExport:(id)sender {
ExportView *view = [[ExportView alloc] initWithNibName:@"ExportView" bundle:nil];
[view.view setHidden:YES];
[self.window.contentView addSubview:view.view];
[view.pic1 setImage:self.pic1.image];
[view.pic2 setImage:self.pic2.image];
[view.pic3 setImage:self.pic3.image];
[view.icon setImage:self.icon.image];
// Setup the image to render
NSRect imgRect = view.view.frame;
NSSize imgSize = imgRect.size;
NSBitmapImageRep *rep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
pixelsWide:imgSize.width
pixelsHigh:imgSize.height
bitsPerSample:8
samplesPerPixel:4
hasAlpha:YES
isPlanar:NO
colorSpaceName:NSDeviceRGBColorSpace
bitmapFormat:NSAlphaFirstBitmapFormat
bytesPerRow:0
bitsPerPixel:0];
NSGraphicsContext *g = [NSGraphicsContext graphicsContextWithBitmapImageRep:rep];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:g];
// Set view background color
CALayer *viewLayer = [CALayer layer];
[viewLayer setBackgroundColor:[NSColor clearColor].CGColor];
[view.view setWantsLayer:YES];
[view.view setLayer:viewLayer];
[view.view setHidden:NO];
// Render
CGContextRef zCgContextRef = (CGContextRef) [g graphicsPort];
[[view.view layer] renderInContext:zCgContextRef];
[view.view removeFromSuperview];
// Get the Data for the image
NSData *exportedData = [rep representationUsingType:NSJPEGFileType properties:nil];
// Start the savepanel
NSSavePanel *savepanel = [NSSavePanel savePanel];
savepanel.title = @"Save chart";
[savepanel setAllowedFileTypes:[NSArray arrayWithObject:@"jpg"]];
[savepanel setNameFieldStringValue:@"Test"];
[savepanel beginSheetModalForWindow:self.window completionHandler:^(NSInteger result)
{
if (NSFileHandlingPanelOKButton == result)
{
NSURL* fileURL = [savepanel URL];
if ([fileURL.pathExtension isEqualToString:@""])
fileURL = [fileURL URLByAppendingPathExtension:@"jpg"];
[exportedData writeToURL:fileURL atomically:YES];
}
}];
}