iOS，无法委托(delegate)viewDidLoad之外

Question

我有这个appdelegate.h

#import <UIKit/UIKit.h>
@interface appDelegate : NSObject <UIApplicationDelegate> {
  UIWindow *window;
  NSString *name;

}
@property (nonatomic, retain) NSString *name;
@end

和 .m 文件

@synthesize name;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    name=@"john";
    return YES;
   }

现在......我想从另一个 Controller 获取这个名称，如果我尝试在我的 viewDidLoad 方法中调用它，它会起作用......

- (void)viewDidLoad
{
    appDelegate *test= (appDelegate *)[[UIApplication sharedApplication] delegate];
    NSLog(@"%@", test.name);
}

但是如果我尝试在 initWithNibName 中做同样的事情，它就不起作用......

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        appDelegate *test= (appDelegate *)[[UIApplication sharedApplication] delegate];
        NSLog(@"%@", test.name);
    }

谁能帮帮我？这个问题让我发疯......

Answer 1

如果您要覆盖-initWithNibName:，则需要返回该类的实例(或self)； 在 -initWithNibName: 中尝试以下代码。它对我有用。

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    appDelegate *test= (appDelegate *)[[UIApplication sharedApplication] delegate];
    NSLog(@"%@", test.name);

   if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {

   }
   return self;
}

我认为这可能对你有用。