这个问题通常发生在使用Facebook SDK的项目中,原因是缺少引入Facebook SDK中的头文件或者缺少相关的框架。 可以尝试引入如下的框架:
#import
#import
并在AppDelegate.m中添加如下代码:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[[FBSDKApplicationDelegate sharedInstance] application:application
didFinishLaunchingWithOptions:launchOptions];
// Override point for customization after application launch.
return YES;
}
// FacebookSDK
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
BOOL handled = [[FBSDKApplicationDelegate sharedInstance] application:application
openURL:url
sourceApplication:sourceApplication
annotation:annotation
];
// Add any custom logic here.
return handled;
}