在 iOS 中加载/保存设置
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load/save settings in iOS
提问by Dutchie432
I have the following two procedures defined in my AppDelegate. saveSettings and loadSettings. I am calling my loadSettings procedure in the AppDidFinishLaunching method, and I am calling the saveSettings procedure in my settings view, once the save button is clicked.
我在 AppDelegate 中定义了以下两个过程。saveSettings 和 loadSettings。我正在 AppDidFinishLaunching 方法中调用我的 loadSettings 过程，并且一旦单击保存按钮，我将在我的设置视图中调用 saveSettings 过程。
Both methods seem to be called at the right time, the right number of times (once), and using the correct data. my settings object gets the right data, but the data does not seem to be actually saving. When I run the load code, my resulting variables are coming back empty (not nil).
这两种方法似乎都在正确的时间、正确的次数（一次）和使用正确的数据被调用。我的设置对象获得了正确的数据，但数据似乎并未实际保存。当我运行加载代码时，我的结果变量返回空（不是零）。
I tried putting the same loading code in a different view and it works fine, but for some reason, I am not getting results in my appDelegate.
我尝试将相同的加载代码放在不同的视图中，它工作正常，但由于某种原因，我的 appDelegate 中没有得到结果。
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window addSubview:navigationController.view];
[window makeKeyAndVisible];
[self loadSettings];
[self setDefaults];
}
-(void)loadSettings{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
settings.masterLocation = [prefs objectForKey:@"masterLocation"];
settings.masterPort = [prefs objectForKey:@"masterPort"];
settings.userName = [prefs objectForKey:@"userName"];
settings.passWord = [prefs objectForKey:@"passWord"];
settings.autoLogin=[prefs objectForKey:@"autoLogin"];
if (settings.autoLogin == nil)
settings.autoLogin=@"N";
}
-(void)saveSettings:(SharedData *)d{
settings=d;
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:settings.masterLocation forKey:@"masterLocation"];
[prefs setObject:settings.masterPort forKey:@"masterPort"];
[prefs setObject:settings.userName forKey:@"userName"];
[prefs setObject:settings.passWord forKey:@"passWord"];
[prefs setObject:settings.autoLogin forKey:@"autoLogin"];
}
回答by Dutchie432
Doh.
多。
In saveSettings, I was missing my [prefs synchronize];
在 saveSettings 中，我缺少我的 [首选项同步]；
回答by navins
to make it sample:
使其采样：
//Writing
[[NSUserDefaults standardUserDefaults] setInteger:1 forKey:@"anInt"];
[[NSUserDefaults standardUserDefaults] setDouble:1.2 forKey:@"aDouble"];
[[NSUserDefaults standardUserDefaults] setString:@"aString" forKey:@"aString"];
[[NSUserDefaults standardUserDefaults] synchronize];
//Reading:
int i = [[NSUserDefaults standardUserDefaults] integerForKey:@"anInt"]
