IOS訪問應用程序級屬性容易

Question

我在AppDelegate的屬性，我想輕鬆地抓取。到目前爲止，它不是爲我工作按計劃進行：

[(AppDelegate *)[UIApplication sharedApplication] wasLoggedIn] = YES

AppDelegate.h

@property (nonatomic, assign) BOOL wasLoggedIn; 

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    wasLoggedIn = false; 
} 

我在做什麼錯？

Answer 1

[(AppDelegate *)[UIApplication sharedApplication] wasLoggedIn] = YES; 

應該

[(AppDelegate *)[[UIApplication sharedApplication] delegate] wasLoggedIn] = YES; 

你打電話的那一刻就UIApplication的實例的方法。