blocks|key|175053|text|在MainVC中获取一个属性，并从FirstVC中传递值，然后它将为您工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|175054|以下代码必须为MainVC格式|175055|@property+(strong,+nonatomic)+NSString+*str;+
@synthesize+str;|code-block|syntax|javascript|175056|在FirstVC中|175057|MainVC+*+vc+=+[[MainVC+alloc]init];
vc.str+=+@"test";|175058|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Take a Property in MainVC and Pass value from FirstVC then It will work for you.

the following code must be in MainVC

<pre><code>@property (strong, nonatomic) NSString *str; 
@synthesize str;
</code></pre>

in FirstVC

<pre><code>MainVC * vc = [[MainVC alloc]init];
vc.str = @"test";
</code></pre>

blocks|key|4654586|text|Step1:|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4654587|您必须创建一个viewcontroller类作为常量|4654588|第2步：|4654589|您可以在常量类中删除.m文件|4654590|Step3:|4654591|您必须在Projectname_Prefix.pch中导入xcode+Constants.h资源，它将是其他资源文件夹中的的。现在常量类将充当全局类。|4654592|Step4:|4654593|现在，您可以在Constants.h.中声明变量在Constants.h中声明的变量将充当全局变量。你可以在任何地方访问它。|4654594|entityMap^0|0|6|0|7|E|O|2|0|0|4|0|4|2|A|2|0|0|6|0|4|M|1P|1|0|0|6|0|7|B|P|B|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1J|8|@$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|R|3|S|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]]|U|$]]

Step1:

You have to create a viewcontroller class as Constants 

Step 2:

You can delete .m file in Constanst class

Step3:

You have to import the Constants.h in Projectname_Prefix.pch which will be xcode's in other resources folder. Now Constant class will act as global class.

Step4:

Now, you can declare variables in Constants.h. The variables those declared in Constants.h will act as global variable. you can access it anywhere.

blocks|key|4172060|text|您最好的选择是使用prepareForSegue方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4172061|在这个方法中，我通常有类似这样的东西|4172062|if+([segue.identifier+isEqualToString@"segueName"]){
++++//I+use+this+if+statement+to+check+which+segue+I+am+performing,+if+I+have+multiple
++++//segues+from+a+single+view+controller
++++FirstVc+*newViewController+=+segue.destinationViewController;
++++newViewController.str+=+self.str;
}|code-block|syntax|javascript|4172063|这将把字符串从你的主VC传递给你的新VC。这一切都假设您的转换是在界面构建器中进行布局的，或者是以某种方式允许您访问序列和标识符的|4172064|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Your best bet is going to be in the [prepareForSegue] method

within that method I usually have something like 

<pre><code>if ([segue.identifier isEqualToString@"segueName"]){
 //I use this if statement to check which segue I am performing, if I have multiple
 //segues from a single view controller
 FirstVc *newViewController = segue.destinationViewController;
 newViewController.str = self.str;
}
</code></pre>

This will pass the string from your main VC to your new VC. This is all assuming that your transitions are laid out in Interface Builder or some way that gives you access to the segues and identifiers

blocks|key|821504|text|SecondViewController+*secondViewController+=+[[SecondViewController+alloc]+initWithNibName:@"SecondViewController"+bundle:nil];
secondViewController.str1+=+str;
[self.navigationController+pushViewController:secondViewController+animated:YES];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|821505|这是一个更快、更简单的解决方案。|unstyled|821506|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>SecondViewController *secondViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
secondViewController.str1 = str;
[self.navigationController pushViewController:secondViewController animated:YES];
</code></pre>

It's a quicker and easy solution.

I have one controller with variable like

<pre><code>NSString *str;
</code></pre>

In same controller i am assigning <code>userId</code> in string <code>str</code>.

I need above <code>userId</code> in another controller to show user data.

How should I get value of <code>userId</code> in another controller?

Below is my code:

MainViewController.h

<pre><code>@property (nonatomatic) NSString *str;
</code></pre>

MainViewController.m

<pre><code>@synthesize str;

str = 1;
</code></pre>

Now in FirstViewController.h

<pre><code>@property(nonatomatic, retain) MainViewController *mainCon;
</code></pre>

FirstViewController.m

<pre><code>@synthesize mainCon;

NSLog(@"user id is %@", mainCon.str);
</code></pre>

Here in log i am getting null value.

How to pass variable from one controller to another in ios?

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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我有一个带变量的控制器，比如NSString *str;在同一个控制器中，我在字符串str中分配userId。我需要在另一个控制器的userId上面显示用户数据。我应该如何在另一个控制器中获取userId的值？下面是我的代码：MainViewController.h@property (nonatomatic) NSS...

问在ios中如何将变量从一个控制器传递到另一个控制器？
EN

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问在ios中如何将变量从一个控制器传递到另一个控制器？EN