在类之间传递NSString值 [英] Passing NSString value between classes

问题描述

我一直在寻找一个解决方案如何传递值从一个类到另一个。基本上，我通过@property在Settings类中创建一个NSString，它是模态显示。然后我根据选择的设置将NSString设置为一个特定的值，我想有一个类中显示的值，设置应该改变。我还通过@property在第二个类中声明一个字符串，并使用代码

  myController * controller = [[myController alloc ] 在里面]; 
 secondClassString = controller.firstClassString 
  

如果我NSLog的字符串，它显示第二类...
任何想法如何使它通过的价值？感谢

解决方案

假设您有两个视图控制器说 A B

{
NSString * strData;
int cId;
}

@property（nonatomic，retain）NSString * strData;
@property（readwrite）int cId;


现在在您的Am

  @synthesize strData，cId; 
  

您的Bh

  @class A 
 
 {
 A * aObj; 
} 
  

现在在您的Bm

  #importAh
 
  - （void）viewDidLoad 
 {
 aObj = [A alloc] init]; // alloc object A 
 [aObj setCId：10]; //为cId设置值
 [aObj setStrData：@Hello from B]; //为strData设置值
 //做什么
 [aObj release]; //不要忘记
} 
  

希望这会帮助你！

I have been looking long for a solution how to pass the value from one class to another. Basically I create a NSString via @property in a Settings class, which is displayed modally. I then set the NSString to a certain value depending on the settings chosen, and I want to have the value shown also in a class where the settings are supposed to make change. I also declare a string via @property in the second class, and I use the code

myController *controller = [[myController alloc] init];
secondClassString = controller.firstClassString

If I NSLog the string, it shows (null) in the second class... Any ideas how to make it pass the value? Thanks

解决方案

suppose you've two viewcontrollers say A & B

Your A.h

{
  NSString *strData;
  int cId;
}

@property (nonatomic, retain) NSString *strData;
@property (readwrite) int cId;

Now In your A.m

@synthesize strData,cId;

Your B.h

@class A

{
   A *aObj;
}

Now In your B.m

#import "A.h"

- (void) viewDidLoad
{
  aObj=[A alloc] init]; //alloc object of A
  [aObj setCId:10]; //set value for cId
  [aObj setStrData:@"Hello from B"]; //set value for strData
  //do what ever
  [aObj release]; //don't forget
}

Hope this helps you!

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