在 Today Extensions (iOS 8) 上保存和加载数据

问题描述

是否可以使用 NSUserDefaults 在 Today Extension 上保存和加载数据?关闭通知中心后，小部件的行为就像一个终止的应用程序，因此任何数据结果都会丢失.我该如何解决这个问题?

Is it possible to save and load data on Today Extension using NSUserDefaults? After closing the Notification Center, the widget behaves like an app which is terminated, so any data results lost. How could I solve this issue?

这是我的代码:

NSUserDefaults *defaults;

- (void)viewDidLoad {

[super viewDidLoad];

defaults = [NSUserDefaults standardUserDefaults];
NSArray *loadStrings = [defaults stringArrayForKey:@"savedStrings"];

if ([loadStrings objectAtIndex:0] != nil) {
    [display setText:[NSString stringWithFormat:@"%@", [loadStrings objectAtIndex:0]]];
}
if ([loadStrings objectAtIndex:1] != nil) {
    calculatorMemory = [NSString stringWithFormat:@"%@", [loadStrings objectAtIndex:1]].doubleValue;
}

}


- (IBAction)saveData:(id)sender {

NSString *displayString;
NSString *memoryString;

NSArray *saveStrings = [[NSArray alloc] initWithObjects: displayString, memoryString, nil];


defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:saveStrings forKey:@"savedStrings"];
[defaults synchronize];


}

推荐答案

你需要使用app group identifier而不是com.*例如:

You need to use app group identifier instead of com.* For instance:

NSUserDefaults *shared = [[NSUserDefaults alloc]initWithSuiteName:@"group.company.appgroup"];

存储数据时不要忘记同步

Don't forget to synchronise when you store data

[shared synchronize];

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