mac 经常无故失去焦点

后来发现其实是软件的问题，比如开机启动一直后台运行的ishot（截屏软件），会获得焦点。

推荐代码：使用Anaconda和pycharm，虚拟环境中安装依赖pip install --upgrade --force-reinstall PyObjC PyObjC-core，并运行如下脚本：

#!/usr/bin/python
try:
    from AppKit import NSWorkspace
except ImportError:
    print("Can't import AppKit -- maybe you're running python from brew?")
    print("Try running with Apple's /usr/bin/python instead.")
    exit(1)

from datetime import datetime
from time import sleep

last_active_name = None
while True:
    active_app = NSWorkspace.sharedWorkspace().activeApplication()
    if active_app['NSApplicationName'] != last_active_name:
        last_active_name = active_app['NSApplicationName']
        print('%s: %s [%s]' % (
            datetime.now().strftime('%Y-%m-%d %H:%M:%S'),
            active_app['NSApplicationName'],
            active_app['NSApplicationPath']
        ))
    sleep(1)

参考网址：https://discussionschinese.apple.com/thread/254974399?sortBy=best