iphone应用程序DidFinishLaunching问题

Question

你好 我对 didFinishLaunching 方法有问题。我真的很困惑问题是什么，这就是我粘贴所有代码的原因。问题是应用程序没有启动，它崩溃了，它在控制台中向我显示以下消息：

**[Demo1AppDelegate setMapViewController:]: unrecognized selector sent to instance 0x5649a30
2011-05-25 14:17:58.724 Demo1[10630:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Demo1AppDelegate setMapViewController:]: unrecognized selector sent to instance 0x5649a30'**

我正在使用此代码 在 Demo1appDelegate.h 文件中

#import <UIKit/UIKit.h>
#import "MapViewController.h"

@interface Demo1AppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    MapViewController *mapViewController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;

@end

以及 Demo1AppDelegate.m 文件

#import "Demo1AppDelegate.h"
@interface Demo1AppDelegate ()
@property (nonatomic, retain) MapViewController *mapViewController;
@end

@implementation Demo1AppDelegate

@synthesize window;


#pragma mark -
#pragma mark Application lifecycle

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

    MapViewController *viewController = [[MapViewController alloc] init];
    self.mapViewController = viewController;

    [viewController release];

    [window addSubview:self.mapViewController.view];
    [window makeKeyAndVisible];

    return YES;
}


- (void)dealloc {
    [mapViewController release];

    [window release];
    [super dealloc];
}


@end

Answer 1

我认为

self.mapViewController = viewController;

是问题所在。您没有 mapViewController 的 @synthesize。所以你无法通过 self 访问

或者另一个选择是尝试这个

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

    mapViewController = [[MapViewController alloc] init];
    [window addSubview:mapViewController.view];
    [window makeKeyAndVisible];

    return YES;
}

Answer 2

您需要将 UIApplication

更改

@interface Demo1AppDelegate : NSObject

为

@interface Demo1AppDelegate : NSObject  < UIApplicationDelegate>

这将解决您的问题

Answer 3

问题出在这一行 self.mapViewController = viewController;

你忘记了 @synthesize mapViewController;

Answer 4

合成您的地图视图控制器。

Answer 5

您必须在 Demo1AppDelegate.m 中添加 @synthesize mapViewController;

您还应该在 Demo1AppDelegate.m 的 dealloc 方法中添加 [mapViewController release]; (其中mapViewController是一个实例变量）。

Answer 6

添加委托如下...这可能是问题所在：
@interface Demo1AppDelegate : NSObject

Answer 7

添加

@class MapViewController  

尝试在 Demo1AppDelegate.h 中的 @implementation Demo1AppDelegate 之前

Answer 8

嘿！在哪里添加子视图

[window addSubview:self.mapViewController.view]; [window makeKeyAndVisible];

尝试不使用“self”

[window addSubview:mapViewController.view]; [window makeKeyAndVisible];

只是一个猜测。