xcode 应用程序终止尝试从对象 [0] 插入 nil 对象
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原文地址: http://stackoverflow.com/questions/19373565/
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App terminated attempt to insert nil object from objects[0]
提问by Brandon Boynton
This process is sending eMails, and it works fine, but the framework wants the body of the email to be an NSArray. So I try to convert the NSString to a NSDictionary to include with the NSArray here:
这个过程是发送电子邮件，它工作正常，但框架希望电子邮件的正文是一个 NSArray。所以我尝试将 NSString 转换为 NSDictionary 以包含在 NSArray 中：
NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:kSKPSMTPPartContentTypeKey,
message,kSKPSMTPPartMessageKey,kSKPSMTPPartContentTransferEncodingKey, nil];
then I implement that here:
然后我在这里实现：
smtpTestMessage.parts = [NSArray arrayWithObject:plainPart];
Overall, here is my code:
总的来说，这是我的代码：
NSLog(@"Start eMail");
SKPSMTPMessage *smtpTestMessage = [[SKPSMTPMessage alloc] init];
smtpTestMessage.fromEmail = @"***@gmail.com";
smtpTestMessage.toEmail = @"***@yahoo.com";
smtpTestMessage.relayHost = @"smtp.gmail.com";
smtpTestMessage.requiresAuth = YES;
smtpTestMessage.login = @"***@gmail.com";
smtpTestMessage.pass = @"***";
smtpTestMessage.subject = @"***";
smtpTestMessage.wantsSecure = YES;
smtpTestMessage.delegate = self;
NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:kSKPSMTPPartContentTypeKey,
message,kSKPSMTPPartMessageKey,kSKPSMTPPartContentTransferEncodingKey, nil];
smtpTestMessage.parts = [NSArray arrayWithObject:plainPart];
[NSString stringWithFormat:@"%@",message];
[smtpTestMessage send];
NSLog(@"sent");
But sadly enough, when I run the app, the eMail gets to the last stage... Then the app terminates saying
但遗憾的是，当我运行该应用程序时，电子邮件会进入最后阶段......然后应用程序终止说
2013-10-15 00:43:50.512 BullyBox[3662:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'
*** First throw call stack:
(0x2f61ae8b 0x399156c7 0x2f5540cb 0x2f556749 0xc77f3 0x31dd555f 0x31dd54fb 0x31dd54cb 0x31dc10f3 0x31dd4f13 0x31dd4bdd 0x31dcfc09 0x31da4f59 0x31da3747 0x2f5e5f27 0x2f5e53ef 0x2f5e3bdf 0x2f54e541 0x2f54e323 0x342852eb 0x31e051e5 0xc91b5 0x39e0eab7)
libc++abi.dylib: terminating with uncaught exception of type NSException
EDIT
编辑
Now I keep getting the error:
现在我不断收到错误：
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString appendString:]: nil argument'
Any help is greatly appreciated! Thank you for even reading this! xD <3
任何帮助是极大的赞赏！感谢您阅读本文！xD <3
回答by Kirsteins
Make sure plainPartis created successfully and not a nil.
确保plainPart创建成功而不是零。
回答by Jake Vizzoni
It's tough to judge but if I had to guess plainPartis not getting created. Why do I think this? Let's take a look at the error:
很难判断，但如果我不得不猜测plainPart是不是被创造出来。为什么我会这样想？我们来看看错误：
[__NSPlaceholderArray initWithObjects:count:]:
[__NSPlaceholderArray initWithObjects:count:]:
This points to an alloc/init sequence of calls. The only place in the code you shared where you are allocating an array is here:
这指向一个 alloc/init 调用序列。您共享的代码中分配数组的唯一位置在这里：
smtpTestMessage.parts = [NSArray arrayWithObject:plainPart];
smtpTestMessage.parts = [NSArray arrayWithObject:plainPart];
Therefore, if you are trying to create an array with a nil object, plainPart, then it makes sense why you are getting an error about trying to insert a nil object at location 0.
因此，如果您尝试创建一个带有 nil 对象的数组，plainPart，那么您在尝试在位置 0 插入一个 nil 对象时遇到错误是有道理的。
Try setting a breakpoint right at this call in your code. This will help you narrow down where the crash happens.
尝试在代码中的此调用处设置断点。这将帮助您缩小崩溃发生的范围。
回答by Andrew Hoos
I am not sure what you are trying to do here
我不确定你想在这里做什么
NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:kSKPSMTPPartContentTypeKey,
message,kSKPSMTPPartMessageKey,kSKPSMTPPartContentTransferEncodingKey, nil];
but based on you naming convention you are storing a key in a value location. Also you could switch to the modern objective-C syntax
但根据您的命名约定，您将键存储在值位置。你也可以切换到现代的 Objective-C 语法
NSDictionary *plainPart = @{
message: kSKPSMTPPartContentTypeKey,
kSKPSMTPPartContentTransferEncodingKey: kSKPSMTPPartMessageKey
};
This is equivalent to what you wrote, but more readable. As stated in the other answers it look like there is a problem with the creation of plainPart. Hopefully looking at this should make it easier to debug.
这相当于你写的，但更具可读性。正如其他答案中所述，plainPart 的创建似乎存在问题。希望看看这个应该能让调试更容易。
回答by Hussain Shabbir
Check first this line smtpTestMessage.parts = [NSArray arrayWithObject:plainPart];.
Whether it is smtpTestMessageallocated if yes then check any data exist inside this or not
首先检查这一行smtpTestMessage.parts = [NSArray arrayWithObject:plainPart];。是否已smtpTestMessage分配，如果是，则检查其中是否存在任何数据
