獲取可可中的當前壁紙

Question

我使用此代碼來獲取當前壁紙：

NSURL *imageURL = [[NSWorkspace sharedWorkspace] desktopImageURLForScreen:[NSScreen mainScreen]]; 

這工作得很好，但是當我設置圖片的文件夾是壁紙（如圖片所示），imageURL是一個目錄，所以在這種情況下如何獲得當前壁紙的USURL？

Answer 1

我一直試圖做同樣的事情。 你可以得到當前桌面圖片網址：

1. 充分利用com.apple.spaces屬性列表當前空間UUID，
2. 搜索com.apple.desktop屬性列表的匹配空間，
3. 提取從姓氏財產

我仍然在做這個，但下面的代碼獲得正確的網址...有時URL。 主要問題是屬性列表沒有足夠頻繁地更新，並且我還沒有能夠強制它們刷新（短暫停止停靠）。讓我知道你是否想出點什麼！

NSDictionary *spacesPLIST = (__bridge NSDictionary *)(CFPreferencesCopyAppValue(CFSTR("SpacesConfiguration"), CFSTR("com.apple.spaces"))); 
NSDictionary *desktopPLIST = (__bridge NSDictionary *)(CFPreferencesCopyAppValue(CFSTR("Background"), CFSTR("com.apple.desktop"))); 

NSArray *monitors = [spacesPLIST valueForKeyPath:@"Management Data.Monitors"]; 
NSInteger monitorIndex = 0; 
if ([monitors count] > 1) { 
    //search for main (or ask user to select) 
} 
NSDictionary *monitor = [monitors objectAtIndex:monitorIndex]; 
NSDictionary *spaces = [desktopPLIST valueForKey:@"spaces"]; 
NSString *currentSpaceUUID = [monitor valueForKeyPath:@"Current Space.uuid"]; 
NSDictionary *currentSpace = [spaces valueForKey:currentSpaceUUID]; 
NSURL *desktopPicturesDirectory = [NSURL fileURLWithPath:[currentSpace valueForKeyPath:@"default.ChangePath"] isDirectory:true]; 
NSString *desktopPictureName = [currentSpace valueForKeyPath:@"default.LastName"]; 
NSURL *desktopPictureURL = [NSURL URLWithString:desktopPictureName relativeToURL:desktopPicturesDirectory]; 
[[NSWorkspace sharedWorkspace] selectFile:[desktopPictureURL path] inFileViewerRootedAtPath:@""]; 

Answer 2

還有另一種方式可以通過截取當前壁紙來獲取圖像。

extension NSImage { 

    static func desktopPicture() -> NSImage { 

     let windows = CGWindowListCopyWindowInfo(
      CGWindowListOption.OptionOnScreenOnly, 
      CGWindowID(0))! as NSArray 

     var index = 0 
     for var i = 0; i < windows.count; i++ { 
      let window = windows[i] 

      // we need windows owned by Dock 
      let owner = window["kCGWindowOwnerName"] as! String 
      if owner != "Dock" { 
       continue 
      } 

      // we need windows named like "Desktop Picture %" 
      let name = window["kCGWindowName"] as! String 
      if !name.hasPrefix("Desktop Picture") { 
       continue 
      } 

      // wee need the one which belongs to the current screen 
      let bounds = window["kCGWindowBounds"] as! NSDictionary 
      let x = bounds["X"] as! CGFloat 
      if x == NSScreen.mainScreen()!.frame.origin.x { 
       index = window["kCGWindowNumber"] as! Int 
       break 
      } 
     } 

     let cgImage = CGWindowListCreateImage(
      CGRectZero, 
      CGWindowListOption(arrayLiteral: CGWindowListOption.OptionIncludingWindow), 
      CGWindowID(index), 
      CGWindowImageOption.Default)! 

     let image = NSImage(CGImage: cgImage, size: NSScreen.mainScreen()!.frame.size) 
     return image 
    }   
} 

這種方法看起來更簡單恕我直言，如果你需要的圖片，而不是網址。

請注意，在com.apple.dektop plist中不再定義壁紙：從小牛開始，設置被移至〜/ Library/Application Support/Dock/desktoppicture.db。這是SQLite文件，「data」表包含url。