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我正在学习如何制作短信发送者。

我为电子邮件、Facebook 和 Twitter 创建了一个发件人：所有这些都有效。但是，我的短信发件人在单击按钮时会在运行时引发异常。

这是我的完整堆栈：

2015-07-17 22:43:13.410 Give[15706:340810] *** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“应用程序试图在目标上呈现一个 nil 模态视图控制器。”
*** 首先抛出调用堆栈：
(
    0 核心基础 0x0000000100911c65 __exceptionPreprocess + 165
    1 libobjc.A.dylib 0x000000010247cbb7 objc_exception_throw + 45
    2 UIKit 0x00000001012ed80d-[UIViewController _presentViewController:withAnimationController:completion:] + 3238
    3 UIKit 0x00000001012ef6c1 __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 132
    4 UIKit 0x00000001012ef5e5-[UIViewController presentViewController:animated:completion:] + 229
    5 给 0x0000000100432742 _TFC4Give14ViewController19sendFromTextMessagefS0_FPSs9AnyObject_T_ + 1058
    6 给 0x00000001004327d6 _TToFC4Give14ViewController19sendFromTextMessagefS0_FPSs9AnyObject_T_ + 54
    7 UIKit 0x00000001011b1d62-[UIApplication sendAction:to:from:forEvent:] + 75
    8 UIKit 0x00000001012c350a-[UIControl_sendActionsForEvents:withEvent:] + 467
    9 UIKit 0x00000001012c28d9-[UIControl touchesEnded:withEvent:] + 522
    10 UIKit 0x00000001011fe958-[UIWindow_sendTouchesForEvent:] + 735
    11 UIKit 0x00000001011ff282 -[UIWindow 发送事件：] + 682
    12 UIKit 0x00000001011c5541-[UIApplication sendEvent:] + 246
    13 UIKit 0x00000001011d2cdc _UIApplicationHandleEventFromQueueEvent + 18265
    14 UIKit 0x00000001011ad59c _UIApplicationHandleEventQueue + 2066
    15 核心基础 0x0000000100845431 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    16 核心基础 0x000000010083b2fd __CFRunLoopDoSources0 + 269
    17 核心基础 0x000000010083a934 __CFRunLoopRun + 868
    18 核心基础 0x000000010083a366 CFRunLoopRunSpecific + 470
    19 图形服务 0x0000000104081a3e GSEventRunModal + 161
    20 UIKit 0x00000001011b08c0 UIApplicationMain + 1282
    21 给 0x0000000100439ab7 主要 + 135
    22 libdyld.dylib 0x0000000108105145 开始 + 1
    23 ？？？0x0000000000000001 0x0 + 1
)
libc++abi.dylib：以 NSException 类型的未捕获异常终止
(lldb)

这是我从短信发送的代码：

@IBAction func sendFromTextMessage(sender: AnyObject) {
    var textMessage = MFMessageComposeViewController() //doesn;t work right now
    textMessage.body = "Check out my amazing campaign app on Give!"
    textMessage.recipients = ["6505555555"] //changed from my real number
    textMessage.messageComposeDelegate = self
    self.presentViewController(textMessage, animated: true, completion: nil)
}

func messageComposeViewController(controller: MFMessageComposeViewController!, didFinishWithResult result: MessageComposeResult) {
    switch result.value {
    case MessageComposeResultCancelled.value:
        print("Message Cancelled")
    case MessageComposeResultFailed.value:
        print("Message Failed")
    case MessageComposeResultSent.value:
        print("Message Sent")
    default:
        break
    }
    self.dismissViewControllerAnimated(true, completion: nil)
}
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