Xcode错误：预期的标识符

Question

我在此代码行中收到一条错误，指出“预期标识符”

UINavigationController *navController1 = [[[UINavigationController alloc] initWithRootViewController:viewController4]];  

此代码放置在应用程序Delegate中，如下所示

#import "AppDelegate.h"

#import "FirstViewController.h"

#import "SecondViewController.h"

#import "ParkTable.h"
#import "TableTest.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize tabBarController = _tabBarController;
@synthesize ParkTableDel = _tableViewController;
@synthesize navController;




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

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
UITableViewController *viewController3 = [[ParkTable alloc] initWithNibName:@"ParkTable" bundle:nil];
UITableViewController *viewController4 = [[TableTest alloc] initWithNibName:@"TableTest" bundle:nil];
UINavigationController *navController1 = [[[UINavigationController alloc] initWithRootViewController:viewController4]];  

self.tabBarController = [[UITabBarController alloc] init];
self.ParkTableDel = [[UITableViewController alloc] init];

self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, viewController3, viewController4, nil];
self.window.rootViewController = self.tabBarController;    
[self.window makeKeyAndVisible];
return YES;
}

// [...] Boilerplate code removed.
@end

我想知道我必须改变什么以使其正确。

Answer 1

这可能是额外的括号吗？ []

Answer 2

正如卢克所指出的，你有一套额外的括号。

要纠正黑屏，请尝试..

[self.window addSubview: self.tabBarController.view]

而不是..

self.window.rootViewController = self.tabBarController; 

Answer 3

有同样的问题。它可能是你的代码行附近的[]的额外集合。