我使用下面的代碼(從AppDelegate文件)將登錄的Facebook用戶名保存到NSUserDefaults首選項。該代碼檢索用戶名並將其輸出到控制檯就好了。當我嘗試在另一個視圖控制器中做同樣的事情時,NSLog輸出返回(null)。從NSUserDefaults檢索數據 - 在一個視圖中工作,但在另一個視圖中失敗
我錯過了什麼?謝謝你的幫助。
- (void)request:(FBRequest *)request didLoad:(id)result {
if ([result isKindOfClass:[NSDictionary class]]) {
NSDictionary* hash = result;
NSString *username = (NSString*)[hash valueForKey:@"name"];
[[NSUserDefaults standardUserDefaults] setObject:username forKey:@"Username"];
NSLog(@"%@", username);
NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults];
NSString *user = [standardUserDefaults stringForKey:@"Username"];
NSLog(@"username from user defs %@",user);
}
};
下面是從其他視圖控制器不工作代碼:
NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults];
NSString *user = [standardUserDefaults stringForKey:@"Username"];
NSLog(@"username from user defs %@",user);
userNameLbl.text = user;
這裏的日誌輸出:
username from user defs app delegate my Facebook name
2012-03-30 13:29:20.564 project V2[63339:15803] (null)
2012-03-30 13:29:20.565 project V2[63339:15803] username from user defs app delegate (null)
2012-03-30 13:29:28.620 project V2[63339:15803] username from user defs (null)
我添加#import「AppDelegate.h」到視圖控制器,一切都很好。 – hanumanDev 2012-03-30 12:27:05