nsimage

问题 I have an NSImage . I would like to read the NSColor for a pixel at some x and y. Xcode seems to thing that there is a colorAtX:y: method on NSImage , but this causes a crash saying that there is no such method for NSImage. I have seen some examples where you create an NSBitmapImageRep and call the same method on that, but I have not been able to successfully convert my NSImage to an NSBitmapImageRep . The pixels on the NSBitmapImageRep are different for some reason. There must be a simple

问题 I've got an NSImageView that takes up the full extent of a window. There's no border to the image view, and its set to display in the lower left. So this means that the origin of the view matches the origin of actual image, no matter how the window is resized. Also, the image is much larger than what I can reasonably fit at full scale on the screen. So I also have the imageview set to proportionally scale down the size of the image. However, I can't seem to find this scale factor anywhere. My

问题 I have a problem where my application aggressively consumes memory to a "thrashing point" with successive image file loads. For example, consider the following code, which repeatedly loads and releases a 15MB JPEG file (large file size for test purposes): NSURL *inputUrl = [NSURL URLWithString:@"file:///Users/me/Desktop/15MBjpeg.jpg"]; for(int i=0; i<1000; i++) { NSImage *image = [[NSImage alloc] initWithContentsOfURL:inputUrl]; [image release]; } It performs quickly for the first several

问题 When I want to set a image from my disc ( /Users/me/Desktop/image.png ) to the image of my NSImageView with NSImage(byReferencingFile: ) it does not show it. When I try NSImage(named: ) with an image stored in the assets-folder , it works. The code within the viewController class ViewController: NSViewController { @IBOutlet var imageView: NSImageView! override func viewDidLoad() { super.viewDidLoad() imageView.image = NSImage(byReferencingFile: "/Users/me/Desktop/image.png") } } The imageView

问题 I need to use CIAffineClamp in order to extend the image and prevent Gaussian Blur from blurring out edges of the image. I have the following code working in Swift 2: let transform = CGAffineTransformIdentity let clampFilter = CIFilter(name: "CIAffineClamp") clampFilter.setValue(inputImage, forKey: "inputImage") clampFilter.setValue(NSValue(CGAffineTransform: transform), forKey: "inputTransform") In Swift 3 CGAffineTransformIdentity was renamed to CGAffineTransform.identity . My code compiles

问题 I needed to implement the following code in my image view to make a gif properly animate: self.homeView.radarImageView.animates = YES; self.homeView.radarImageView.canDrawSubviewsIntoLayer = YES; self.homeView.radarImageView.image = currentData.radarImage; Unfortunately, the canDrawSubviewsIntoLayer method is not compatible with OSX prior to 10.9. Is there an alternative approach that I can use that will make this work in OSX 10.7 and higher? 回答1: avoid layer-based views under 10.8 and below

问题 I'm trying to load an image from an absolute path into an NSImage and even though the same full path works in other scenarios when I'm using it in this context, the variable just ends up being nil . I've tried using both the file path and an NSURL to achieve it. //: Playground - noun: a place where people can play import Cocoa import AppKit print ("Starting") /** Attempt to do via NSURL **/ // The workspace var workspace = NSWorkspace.sharedWorkspace() // Main screen var screen = NSScreen

问题 I think i'm missing something really basic here. If I do this with a legal URL/path which I know exists: NSImage* img = [[NSImage alloc] initWithContentsOfFile:[[selectedItem url] path]]; NSLog(@"Image width: %d height: %d", [img size].width, [img size].height); then I get reported to the console that the width is -2080177216 and the height 0. Although I know that the width is actually 50 and the height 50. I tried calling isValid and it returns YES, and I also tried checking the size of the

问题 I'm trying to load an image using NSImage imageNamed: method but i have no success i have copied the image in the project folder: Project>Resources and added to the project using: "Add files to project ..." NSImage* image = [NSImage imageNamed:@"logosH"]; if (image == nil){ NSLog(@"NULL :/"); } NSImageView *accessory = [[NSImageView alloc] initWithFrame:NSMakeRect(0,0,200,55)]; [accessory setImageScaling:NSScaleToFit]; [accessory setImage:[NSImage imageNamed:@"logosH.png"]]; [myAlert

问题 I’m using a NSSearchField (not subclassed). When it’s not focused, the placeholderString is centered. But the lupe icon on the left appears a bit offset, so in fact the whole thing appears not to be centered. Is it possible to hide the lupe icon? 回答1: There is not any direct access to the icon, so that a workaround is first access to the NSSearchField cell (casted as shown), and afterwards access to its button cell. self in this example is an instance of NSSearchField [(NSButtonCell *)[