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我想考出pyobjc绑定ImageCaptureCore，我不能让我的委托的回调在所有火：使用ImageCaptureCore与pyobjc
"""ImageCaptureCore test app."""
from __future__ import (
absolute_import,
division,
print_function,
)
import time
import objc
from AppKit import NSObject
from ImageCaptureCore import (
ICCameraDevice,
ICDeviceBrowser,
ICDeviceLocationTypeMaskLocal,
ICDeviceTypeMaskCamera,
)
class ICDelegate(NSObject):
"""Implements ICDeviceBrowserDelegate."""
def __new__(cls):
"""Create a new `ICDelegate`."""
return ICDelegate.alloc().init()
def init(self):
self = objc.super(ICDelegate, self).init()
if self is None:
return None
self.devicesFetched = False
print("Delegate initialized.")
return self
# ICDeviceBrowserDelegate callbacks
def deviceBrowserDidEnumerateLocalDevices_(self, browser):
print("Done fetching devices.")
self.devicesFetched = True
def deviceBrowser_didAddDevice_moreComing_(self, browser, device, moreComing):
print("Device added.")
def deviceBrowser_didRemoveDevice_moreGoing_(self, browser, device, moreGoing):
print("Device removed.")
delegate = ICDelegate()
browser = ICDeviceBrowser.alloc().init()
browser.setDelegate_(delegate)
browser.setBrowsedDeviceTypeMask_(ICDeviceTypeMaskCamera | ICDeviceLocationTypeMaskLocal)
browser.start()
print("Fetching cameras...")
while not delegate.devicesFetched:
time.sleep(1)
print("Still fetching cameras...")
# We never get past this!
从我的API的理解，一旦ICDeviceBrowser完成获取设备列表（即使没有设备插入），我应该得到didEnumerateLocalDevices回拨，并且我应该为每个连接的设备获得didAddDevice。相反，我得到什么（不管我是否插上的设备或没有，之前或之后，我开始我的剧本，我已经尝试了普通的USB摄像头以及一个iPhone）：
Delegate initialized. Fetching cameras... Still fetching cameras... Still fetching cameras... Still fetching cameras... Still fetching cameras...
有什么其他类型的设置需要发生才能使ICDeviceBrowser开始工作？我看过本地objc示例，它看起来看起来就像我正在做同样的事情，但我一直无法找到任何可以跟随的pyobjc绑定示例。