macos - 如何以编程方式更改系统范围的桌面图片？

Question

我使用以下代码来设置桌面图片:

NSURL* newImage = [[NSURL alloc] initFileURLWithPath:@"/Users/name/Pictures/test.png"];
[[NSWorkspace sharedWorkspace] setDesktopImageURL:newImage forScreen:screen options:nil error:&nserror];

它工作正常，桌面图片按照我的要求改变了。但它不会更改系统范围的桌面首选项(例如，每 30 分钟更改一次图片)。如何更改系统范围的桌面首选项？

Answer 1

看看Preferences and Settings Programming Guide 。这应该有帮助。

编辑:
这是示例代码:

NSString* newImgPath = @"/Users/cody/Desktop/stuff/imgs/Black_mac.png";

NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
NSMutableDictionary* desktopDict = [NSMutableDictionary dictionaryWithDictionary:[defaults persistentDomainForName:@"com.apple.desktop"]];
NSMutableDictionary* bgDict = [desktopDict objectForKey:@"Background"];
NSMutableDictionary* spaces = [bgDict objectForKey:@"spaces"];
[spaces enumerateKeysAndObjectsUsingBlock:^(NSString* key, NSMutableDictionary* obj, BOOL *stop) {
    [obj enumerateKeysAndObjectsUsingBlock:^(id key, NSMutableDictionary* prefs, BOOL *stop) {
        [prefs setObject:newImgPath forKey:@"ImageFilePath"];
        [prefs setObject:newImgPath forKey:@"NewImageFilePath"];
        [prefs setObject:@"Never" forKey:@"Change"];
    }];
}];

//NSLog(@"%@", desktopDict);

[defaults setPersistentDomain:desktopDict forName:@"com.apple.desktop"];
if ([defaults synchronize] == NO)
    NSLog(@"synchronize failed");

// Restart dock
system ("/usr/bin/killall Dock");