Używam Xcode 4.4.1. Kiedy definiuję@property lubićUINavigationController lubNSArrayw pliku .h muszę@synthesize to w pliku .m. Ale niektóre@property lubićUITabBarController lubNSString Nie muszę@synthesize aby to działało.

Moje pytanie jest co@propertypotrzeba@synthesize i czego nie trzeba.

AppDelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
UITabBarController *_tabBar;
UINavigationController *_navBar;
}

@property (strong, nonatomic) UIWindow *window;
@property (nonatomic, retain) Employee *empView;
@property (nonatomic, retain) UITabBarController *_tabBar;
@property (nonatomic, retain) UINavigationController *_navBar;

AppDelegate.m

@implementation AppDelegate
@synthesize _navBar;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
Employee *emp = [[Employee alloc]initWithNibName:@"Employee" bundle:nil];
self._tabBar = [[UITabBarController alloc]init];
self._navBar = [[UINavigationController alloc]initWithRootViewController:emp];
self._tabBar.viewControllers = [NSArray arrayWithObjects:_navBar, nil];
self.window.rootViewController = self._tabBar;
self._navBar.navigationBar.tintColor = [UIColor brownColor];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}

Kiedy ja@synthesize UINavigationController dostajęUINavigationController iUITabBarController. Ale kiedy nie@synthesize UINavigationController Nie rozumiemUINavigationController aleUITabBarController jest wyświetlany.

W obu przypadkach nie@synthesize UITabBarController

Dzięki