Iphone 在iOS中，从连接到计算机的设备加载摄像头速度较慢

我收到以下警告：

warning: Unable to read symbols for /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 (8L1)/Symbols/System/Library/Frameworks/IOKit.framework/IOKit (file not found).
warning: No copy of IOKit.framework/IOKit found locally, reading from memory on remote device.  This may slow down the debug session.
warning: Tried to remove a non-existent library: /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 (8L1)/Symbols/System/Library/Frameworks/IOKit.framework/IOKit

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这是为什么？如何解决？

此错误表示您缺少/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 8L1/Symbols/System/Library/Frameworks/IOKit.framework框架。您是否安装了xcode/developer工具的其他副本？如果是这样，您可能需要通过此版本的设备支持进行复制

选择1

此框架通常在/System/Library/Frameworks/IOKit.framework中可用，如果它不在那里，请使用以下命令查找它：find/System-type d-name IOKit.framework或find/Developer-type d-name IOKit.framework，以便通过打开Terminal.app并键入以下命令，将其复制到xcode正在查找的位置：

[ 16:01 root@MacBookPro / ]# sudo cp -rv /System/Library/Frameworks/IOKit.framework "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 (8L1)/Symbols/System/Library/Frameworks/IOKit.framework"

如果由于没有/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 8L1目录而失败，那么您可以执行以下操作：

[ 16:01 root@MacBookPro / ]# mkdir -p "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 (8L1)/Symbols/System/Library/Frameworks/"

然后：

选择2

再次下载xcode/developer工具，将其安装到/developer以外的位置，例如/developer-4.2/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 8L1到/developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 8L1

选择3

查看/Developer/Platforms/iPhoneOS.platform/DeviceSupport/目录，可能有其他版本，但没有4.3.5 8L1。如果有4.3.5，但没有4.3.5 8L1，则可以使用以下命令在两者之间建立符号链接：

[ 16:01 root@MacBookPro / ]# cd /Developer/Platforms/iPhoneOS.platform/DeviceSupport/
[ 16:01 root@MacBookPro / ]# ln -s /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 "4.3.5 (8L1)"

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或者，只需通过运行/Developer/Library/uninstall devtools命令卸载xcode，然后下载并重新安装。

我检查了，实际上有一个IOKit.framework。。。我尝试了选项3，似乎有4.3.5 8L1，但没有4.3.5

[ 16:01 root@MacBookPro / ]# cd /Developer/Platforms/iPhoneOS.platform/DeviceSupport/
[ 16:01 root@MacBookPro / ]# ln -s /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.5 "4.3.5 (8L1)"