ios 如何在其他视图控制器中获取 nsuserdefault 值
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How to get the nsuserdefault value in other viewcontrollers
提问by Aravindhan
I have two viewcontrollers. In my first viewcontroller:
我有两个视图控制器。在我的第一个视图控制器中：
{
NSString *string=textField.text;
NSUserDefaults *data = [NSUserDefaults standardUserDefaults];
[data setObject:string forKey:@"strings"];
[data synchronize];
}
How do I get the string value in my other viewcontroller?
如何在我的其他视图控制器中获取字符串值？
回答by Chetan Bhalara
Here you can use this in anyway in your application for store value of NSUserDefaults.
在这里，您可以在应用程序中以任何方式使用它来存储 NSUserDefaults 的值。
// --- Saving
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// saving an NSString
[prefs setObject:@"TextToSave" forKey:@"keyToLookupString"];
// saving an NSInteger
[prefs setInteger:42 forKey:@"integerKey"];
// saving a Double
[prefs setDouble:3.1415 forKey:@"doubleKey"];
// saving a Float
[prefs setFloat:1.2345678 forKey:@"floatKey"];
// This is suggested to synch prefs, but is not needed (I didn't put it in my tut)
[prefs synchronize];
Here you can use this in anyway in your application for get value of NSUserDefaults.
在这里，您可以在应用程序中以任何方式使用它来获取 NSUserDefaults 的值。
// --- Retrieving
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// getting an NSString
NSString *myString = [prefs stringForKey:@"keyToLookupString"];
// getting an NSInteger
NSInteger myInt = [prefs integerForKey:@"integerKey"];
// getting an Float
float myFloat = [prefs floatForKey:@"floatKey"];
回答by Jhaliya
you can access NSUserDefaultsin any controller (Any class of your application) of your application with the same code you have written in one class.
您可以使用NSUserDefaults在一个类中编写的相同代码访问应用程序的任何控制器（应用程序的任何类）。
for getting the string value use the below code
要获取字符串值，请使用以下代码
NSUserDefaults *data = [NSUserDefaults standardUserDefaults];
NSString *myString = [data objectForKey:@"strings"];
回答by Krishnabhadra
NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
NSString *myString = [defaults stringForKey:@"strings"];
THis is the way to retrieve the data. Please note NSUserDefaultis not used to pass data between two controllers. There are better methods for that.
这是检索数据的方法。请注意NSUserDefault不用于在两个控制器之间传递数据。有更好的方法。
Edit : After seeing Shaan Singh's comment
编辑：看到Shaan Singh的评论后
To pass data 2 view controllers you can declare a property in second view controller and access that from the present view controller.
要传递数据 2 视图控制器，您可以在第二个视图控制器中声明一个属性并从当前视图控制器访问它。
It is already answered brilliantly here.
它已经在这里得到了精彩的回答。
回答by Chetan
In the other ViewController,
在另一个 ViewController 中，
NSUserDefaults *data = [NSUserDefaults standardUserDefaults];
NSString *string = [data objectForKey:@"strings"];
This will work because NSUserDefaultsare a global key-value store that will persist across classes and applications.
这将起作用，因为NSUserDefaults是一个全局键值存储，它将跨类和应用程序持续存在。
