blocks|key|335460|text|这意味着你要在字典里放的值之一是零，很可能是其中的一幅。您可以尝试将图像赋值给变量，并检查它们以确定是否是这样的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335461|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It means that one of the values you're trying to put in that dictionary is nil, most likely one of the pictures. You might try assigning the images to variables and inspecting them to see if this is the case.

blocks|key|3718350|text|此错误意味着您正在尝试将nil放入字典(不允许)。因为您正在用字符串文字构建字典，所以不可能是nil。这意味着问题在于您的一个或多个图像。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3718351|试试这个来帮助找出问题所在：|3718352|%2B(NSArray+*)users
{
++++UIImage+*image1+=+[UIImage+imageNamed:@"person1.jpeg"];
++++UIImage+*image2+=+[UIImage+imageNamed:@"person2.jpeg"];
++++UIImage+*image3+=+[UIImage+imageNamed:@"person3.jpeg"];
++++UIImage+*image4+=+[UIImage+imageNamed:@"person4.jpeg"];

++++NSDictionary+*user1+=+@{@"username"+:+@"master+photographer",+@"email"+:+@"worldtravel@me.com",+@"password"+:+@"drowssap",+@"age"+:+@24,+@"profilePicture"+:+image1+};
++++NSDictionary+*user2+=+@{@"username"+:+@"Lots+of+tots",+@"email"+:+@"otterskips@me.com",+@"password"+:+@"icecreamrocks",+@"age"+:+@65,+@"profilePicture"+:+image2+};
++++NSDictionary+*user3+=+@{@"username"+:+@"iTechie",+@"email"+:+@"theRealApple@me.com",+@"password"+:+@"infiniteloop",+@"age"+:+@30,+@"profilePicture"+:+image3+};
++++NSDictionary+*user4+=+@{@"username"+:+@"Royal",+@"email"+:+@"king@me.com",+@"password"+:+@"IGotAPalace",+@"age"+:+@0,+@"profilePicture"+:+image4+};

++++NSArray+*userArray+=+@[user1,+user2,+user3,+user4];
++++return+userArray;
}|code-block|syntax|javascript|3718353|现在，您可以使用调试器，查看image1、image2、image3或image4是nil还是为每个nil添加NSLog语句。|3718354|请记住，文件名是区分大小写的，所以请确保传递给imageNamed:的名称与真正的文件名完全匹配。还要验证图像是否具有扩展jpeg，而不是jpg。确保映像正在打包在资源包中。|3718355|entityMap^0|C|3|1B|3|0|0|0|E|6|L|6|S|6|Z|6|16|3|1E|3|1J|5|0|N|B|1P|4|1X|3|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1L|8|@]|D|@]|E|$]]]|R|$]]

The error means you are trying to put <code>nil</code> in the dictionary (which is not allowed). Since you are building the dictionaries with string literals those can't be <code>nil</code>. This means the problem is with one or more of your images.

Try this to help find the problem:

<pre><code>+(NSArray *)users
{
 UIImage *image1 = [UIImage imageNamed:@"person1.jpeg"];
 UIImage *image2 = [UIImage imageNamed:@"person2.jpeg"];
 UIImage *image3 = [UIImage imageNamed:@"person3.jpeg"];
 UIImage *image4 = [UIImage imageNamed:@"person4.jpeg"];

 NSDictionary *user1 = @{@"username" : @"master photographer", @"email" : @"worldtravel@me.com", @"password" : @"drowssap", @"age" : @24, @"profilePicture" : image1 };
 NSDictionary *user2 = @{@"username" : @"Lots of tots", @"email" : @"otterskips@me.com", @"password" : @"icecreamrocks", @"age" : @65, @"profilePicture" : image2 };
 NSDictionary *user3 = @{@"username" : @"iTechie", @"email" : @"theRealApple@me.com", @"password" : @"infiniteloop", @"age" : @30, @"profilePicture" : image3 };
 NSDictionary *user4 = @{@"username" : @"Royal", @"email" : @"king@me.com", @"password" : @"IGotAPalace", @"age" : @0, @"profilePicture" : image4 };

 NSArray *userArray = @[user1, user2, user3, user4];
 return userArray;
}
</code></pre>

Now you can either use the debugger and see if <code>image1</code>, <code>image2</code>, <code>image3</code>, or <code>image4</code> is <code>nil</code> or add <code>NSLog</code> statements for each.

Keep in mind that filenames are case sensitive so be sure the name you pass to <code>imageNamed:</code> exactly matches the real filename. Also verify the images have the extension <code>jpeg</code> and not <code>jpg</code>. Make sure the images are being packaged in your resource bundle.

blocks|key|911920|text|您要创建的UIImages之一是零。请添加以下代码作为方法%2B(NSArray+*)用户的第一行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|911921|NSAssert([UIImage+imageNamed:@"person1.jpeg"]+!=+nil,+@"Person+1+image+does+not+exist");
NSAssert([UIImage+imageNamed:@"person2.jpeg"]+!=+nil,+@"Person+2+image+does+not+exist");
NSAssert([UIImage+imageNamed:@"person3.jpeg"]+!=+nil,+@"Person+3+image+does+not+exist");
NSAssert([UIImage+imageNamed:@"person4.jpeg"]+!=+nil,+@"Person+4+image+does+not+exist");|code-block|syntax|javascript|911922|这段代码片段将在控制台上打印不存在的图像。请在调试时运行，让我们看看断言的结果是什么。|911923|希望这能有所帮助！|911924|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

One of the UIImages you're trying to create are nil. 
Please add the following code as the first line of the method +(NSArray *)users

<pre><code>NSAssert([UIImage imageNamed:@"person1.jpeg"] != nil, @"Person 1 image does not exist");
NSAssert([UIImage imageNamed:@"person2.jpeg"] != nil, @"Person 2 image does not exist");
NSAssert([UIImage imageNamed:@"person3.jpeg"] != nil, @"Person 3 image does not exist");
NSAssert([UIImage imageNamed:@"person4.jpeg"] != nil, @"Person 4 image does not exist");
</code></pre>

That snippet of code will print on console what of the images does not exist. 
Run please on DEBUG and let's see what the result of the assertions is.

Hope this helps!

blocks|key|335550|text|更好的解决方法可能是让"NSDictionary“像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|335551|NSDictionary+*user1+=+[NSDictionary+dictionaryWithObjectsAndKeys:+my+obj+&+key+here,+nil];|code-block|syntax|javascript|335552|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The better cure probably is to make the "NSDictionary" like this:

<pre><code>NSDictionary *user1 = [NSDictionary dictionaryWithObjectsAndKeys: my obj &amp; key here, nil];
</code></pre>

blocks|key|911959|text|“尝试从objects4插入nil对象”意味着索引4处的键或值为nil。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|911960|因此，正如其他人所说的，这将是您的图像之一，因为索引4的键是字符串文本。|911961|entityMap^0|1|B|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

"attempt to insert nil object from objects[4]" means that either the key or value at index [4] is nil.

So as the others have said it would be one of your images since the key at index [4] is a string literal.

i got error NSInvalidArgumentException this is my model class

<pre><code>+(NSArray *)users
{
 NSDictionary *user1 = @{@"username" : @"master photographer", @"email" : @"worldtravel@me.com", @"password" : @"drowssap", @"age" : @24, @"profilePicture" : [UIImage imageNamed:@"person1.jpeg"]};
 NSDictionary *user2 = @{@"username" : @"Lots of tots", @"email" : @"otterskips@me.com", @"password" : @"icecreamrocks", @"age" : @65, @"profilePicture" : [UIImage imageNamed:@"person2.jpeg"]};
 NSDictionary *user3 = @{@"username" : @"iTechie", @"email" : @"theRealApple@me.com", @"password" : @"infiniteloop", @"age" : @30, @"profilePicture" : [UIImage imageNamed:@"person3.jpeg"]};
 NSDictionary *user4 = @{@"username" : @"Royal", @"email" : @"king@me.com", @"password" : @"IGotAPalace", @"age" : @0, @"profilePicture" : [UIImage imageNamed:@"person4.jpeg"]};

 NSArray *userArray = @[user1, user2, user3, user4];
 return userArray;
}

@end
</code></pre>

and this is my viewdidload 

<pre><code>self.users = [DMZUserData users];
NSLog(@"%@", self.users);
</code></pre>

NSInvalidArgumentException', reas-[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[4]'

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我出错了，NSInvalidArgumentException，这是我的模型类+(NSArray *)users{    NSDictionary *user1 = @{@"username" : @"master photographer", @"email" : @"worldtravel@me.com", @"p...

问NSInvalidArgumentException'，reas-[__NSPlaceholderDictionary initWithObjects:forKeys:count:]：尝试从objects[4]插入零对象
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问NSInvalidArgumentException'，reas-[__NSPlaceholderDictionary initWithObjects:forKeys:count:]：尝试从objects[4]插入零对象EN