相当于ios中的共享首选项 [英] equivalent to shared preferences in ios
本文介绍了相当于ios中的共享首选项的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在将一个Android应用程序移植到ios,我使用的一件事是android中的共享首选项,以便在每次完成一个级别时保存。
I am porting an android app to ios, one thing I used was the shared preferences in android to save each time a level was complete.
这样当用户回到应用程序,他们可以看到他们达到3级或其他。
That way when the user gets back into the app, they can see they are up to level 3 or whatever.
iOS中是否有类似的机制?或者我是否必须手动写出特定于应用程序的文件?
Is there a similar mechanism in iOS? or do I have to manually write out to an application specific file?
如果是这样,我该如何写出只对我的应用程序可见的文件?
If so, how do I write out to files only visible to my application?
推荐答案
使用 NSUserDefaults : - 请注意,这是针对小数据的,比如你提到的当前水平。不要滥用它并将其用作大型数据库,因为每次打开应用程序时都会将其加载到内存中,无论您是否需要其他内容(应用程序的其他部分也将使用此内容)。
阅读:
NSUserDefaults *preferences = [NSUserDefaults standardUserDefaults];
NSString *currentLevelKey = @"currentlevel";
if ([preferences objectForKey:currentLevelKey] == nil)
{
// Doesn't exist.
}
else
{
// Get current level
const NSInteger currentLevel = [preferences integerForKey:currentLevelKey];
}
写作:
NSUserDefaults *preferences = [NSUserDefaults standardUserDefaults];
NSString *currentLevelKey = @"currentlevel";
const NSInteger currentLevel = ...;
[preferences setInteger:currentLevel forKey:currentLevelKey];
// Save to disk
const BOOL didSave = [preferences synchronize];
if (!didSave)
{
// Couldn't save (I've never seen this happen in real world testing)
}
。
阅读:
let preferences = NSUserDefaults.standardUserDefaults()
let currentLevelKey = "currentLevel"
if preferences.objectForKey(currentLevelKey) == nil {
// Doesn't exist
} else {
let currentLevel = preferences.integerForKey(currentLevelKey)
}
写作:
let preferences = NSUserDefaults.standardUserDefaults()
let currentLevelKey = "currentLevel"
let currentLevel = ...
preferences.setInteger(currentLevel, forKey: currentLevelKey)
// Save to disk
let didSave = preferences.synchronize()
if !didSave {
// Couldn't save (I've never seen this happen in real world testing)
}
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