摘要：
I understand that the External Accessory framework in iOS 3.0 and later will allow my application to communicate with Bluetooth devices. So why doesn't my application see the Bluetooth accessory sitting next to my iPhone?A:The External Accessory framework is designed to allow iOS applications to 阅读全文
摘要：
The HTML importer should not be called from a background thread (that is, the options dictionary includesNSDocumentTypeDocumentAttribute with a value 阅读全文