自动选择声音输出

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由于我的MacBook pro 接着显示器，显示器上有声音输出，而且又使用了boom2软件，当我插入耳机打算听音乐的时候每次都需要选择声音的输出，真的是很麻烦，我打算把这个转换输出的操作自动化。

目标：每次当audio有变化时，选择耳机选项，如果没有耳机选择则什么都不做。

用AppleScript实现如下：

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tell application "System Preferences"
	activate
	set current pane to pane "com.apple.preference.sound"
end tell

tell application "System Events"
	tell application process "System Preferences"
		repeat until exists tab group 1 of window "Sound"
		end repeat
		tell tab group 1 of window "Sound"
			click radio button "Output"
			tell table 1 of scroll area 1
				if (exists (row 1 where value of text field 1 is "Headphones")) then
					display notification "change output to Headphones"
					select (row 1 where value of text field 1 is "Headphones")
				else
					display notification "not change any output"
				end if
			end tell
		end tell
	end tell
end tell

脚本的难点是判断Headphones选项，exists (row 1 where value of text field 1 is "Headphones")

苹果的选择区域分别为scroll area -> table -> row -> text field

具体的操作实现了，还剩下触发事件。

这个时候就要用到keyboard Masetro了,选择一个trigger The audio output device changes再执行上面的脚本，搞定！