摘要：
Generated by APNs for each deviceDifferent from UDID entered into Program PortalDevice token value may changeApp is restored to a new deviceSame device is erased then app is reinstalled without restore uniquely identifies deviceCall registration API at each app launch and then send to server every t 阅读全文
摘要：
Summary ARC works by adding code at compile time to ensure that objects live as long as necessary, but no longer. Conceptually, it follows the same me 阅读全文