苹果IAP注意事项
Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0x00000018 Triggered by Thread: 0 Filtered syslog: None found Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libc++abi.dylib 0x337a1a64 __dynamic_cast + 212 1 xxxxxxxxx 0x00016482 0x4000 + 74882 2 xxxxxxxxx 0x00016868 0x4000 + 75880 3 xxxxxxxxx 0x00020d46 0x4000 + 118086 4 xxxxxxxxx 0x000208dc 0x4000 + 116956 5 StoreKit 0x26c23f8e __34-[SKProductsRequest _handleReply:]_block_invoke + 506
被reject的iap product，localizedTitle和localizedDescription会是nil，如果直接 [[product localizedTitle] UTF8String]这样使用就会crash，产生类似上面这样的crash log
參考： http://stackoverflow.com/questions/23657046/itunnes-skproduct-localizedtitle-is-nil
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测试流程：
·先退出设备上的appleID
·进游戏选iap充值
·弹出登录框输入iTunes后天配置的sandbox account
·完成测试后退出sandbox appleID（因为苹果规定sandbox账号不能在proudction环境使用）
参考： https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/StoreKitGuide/Chapters/ShowUI.html#//apple_ref/doc/uid/TP40008267-CH3-SW11
越狱设备可能无法测试iap，会报can not connect to iTunes store
如果明明账号密码正确却提示“The Apple ID you entered couldn't be found or your password was incorrect. Please try again”
需要重新配一个sandbox account
参考： http://stackoverflow.com/questions/27049612/how-to-create-test-user-for-in-app-purchase-in-new-ituneconnect