一个用户报告我的应用程序在点击电子邮件按钮后立即崩溃.但是我无法在同一规格的设备上重现问题.
附加崩溃日志.我调用[self presentModalViewController：controller animated：YES];在我的报告VC.m.控制器是MFMailComposeViewController的一个实例.
Incident Identifier: 4A06DE9B-178C-43C2-AE23-D8C7EEED7831 CrashReporter Key: 8b802dcda2f9dfd70003b0bedceac04ef79730f0 Hardware Model: iPad3,6 Process: ATracker [5610] Path: /var/mobile/Applications/ACABBAE7-C701-48AD-9DAC-9B4C0ABD3CFF/ATracker.app/ATracker Identifier: ATracker Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2013-07-15 18:42:30.776 +0100 OS Version: iOS 6.1.3 (10B329) Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000,0x0000000000000000 Crashed Thread: 0 Last Exception Backtrace: 0 CoreFoundation 0x3286c3e2 __exceptionPreprocess + 158 1 libobjc.A.dylib 0x3a70695e objc_exception_throw + 26 2 UIKit 0x34767118 -[UIViewController presentViewController:withTransition:completion:] + 3764 3 UIKit 0x34888d9e -[UIViewController presentModalViewController:animated:] + 26 4 ATracker 0x0007fac2 -[ReportVC sendEmail:] (ReportVC.m:1936) 5 UIKit 0x34766082 -[UIApplication sendAction:to:from:forEvent:] + 66 6 UIKit 0x34766036 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26 7 UIKit 0x34766010 -[UIControl sendAction:to:forEvent:] + 40 8 UIKit 0x347658c6 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 498 9 UIKit 0x34765db4 -[UIControl touchesEnded:withEvent:] + 484 10 UIKit 0x3468e5f4 -[UIWindow _sendtouchesForEvent:] + 520 11 UIKit 0x3467b8dc -[UIApplication sendEvent:] + 376 12 UIKit 0x3467b1ea _UIApplicationHandleEvent + 6194 13 GraphicsServices 0x3636f5f2 _PurpleEventCallback + 586 14 GraphicsServices 0x3636f222 PurpleEventCallback + 30 15 CoreFoundation 0x328413e2 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 30 16 CoreFoundation 0x32841386 __CFRunLoopDoSource1 + 134 17 CoreFoundation 0x3284020a __CFRunLoopRun + 1378 18 CoreFoundation 0x327b3238 CFRunLoopRunSpecific + 352 19 CoreFoundation 0x327b30c4 CFRunLoopRunInMode + 100 20 GraphicsServices 0x3636e336 GSEventRunModal + 70 21 UIKit 0x346cf2b4 UIApplicationMain + 1116 22 ATracker 0x00044fe6 main (main.m:16) 23 ATracker 0x00044f9c start + 36
任何想法或提示表示赞赏！
解决方法
应检测设备canSendMail
[MFMailComposeViewController canSendMail]
如果设备上没有邮件帐户,则返回false.
@see https://stackoverflow.com/a/3671759/946434