Xcode Interface Builder未显示App Delegate对象

问题描述

我正在通过IOS编程：大书呆子牧场指南（第2版）教自己Objective-C和iOS编程，我遇到了一个问题，教程要求我创建与App Delegate对象的连接，但是这个对象没有出现在接口构建器的对象列表中。对于我来说，我很确定它可能是一个拼写错误，也可能是版本不同，因为本书稍微落后于我的Xcode版本（4.2）。我已经包含了代码。我很公平确定MOCAppDelegate对象应该出现在IB中，但我还不熟悉，知道我需要做出哪些代码更改。具体问题：如何调整下面的代码以便我得到一个对象IB中的对象列表，以便我可以按照教程图形中的说明执行连接？

I am teaching myself Objective-C and iOS programming with "IOS Programming: The Big Nerd Ranch guide (2nd Edition) and I have run into an issue where the tutorial wants me to create connections to an App Delegate object, but this object does not appear in the Objects list in Interface builder for me. I am pretty sure its either a typo or perhaps a version different as the book is slightly behind my version of Xcode (4.2). I have included the code. I am fairly certain that the MOCAppDelegate object is what should be showing up in IB, but I am not yet familiar enough to know what code changes I need to make that happen. Specific question: How do I adjust the code below so that I get an object in the Objects list in IB so that I can perform the connections as instructed in the tutorial graphic?

注意：我研究并发现：但这个解决方案对我不起作用（或者我没有正确实现）

Note: I researched and found this: Having trouble hooking up instance variables to AppDelegate but this solution did not work for me (or I did not implement it correctly)

头文件

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>

@interface MOCAppDelegate : UIResponder <UIApplicationDelegate, CLLocationManagerDelegate>
{
    CLLocationManager *locationManager;

    IBOutlet MKMapView *worldView;
    IBOutlet UIActivityIndicatorView *activityIndicator;
    IBOutlet UITextField *locationTitleField;
}

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


@end

实施档案

#import "MOCAppDelegate.h"

@implementation MOCAppDelegate

@synthesize window = _window;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    //Create location manager object
    locationManager = [[CLLocationManager alloc] init];
    [locationManager setDelegate:self];

    //We want all results from the location manager
    [locationManager setDistanceFilter:kCLDistanceFilterNone];

    //And we want it to be as accurate as possible
    //regardless of how much time/power it takes
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];

    //Tell our location manager to start looking for it location immediately
    [locationManager startUpdatingLocation];

    //We also want to know our heading
    if (locationManager.headingAvailable == true) {
        [locationManager startUpdatingHeading];
    }


    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor darkGrayColor];
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"%@", newLocation);
}

- (void)locationManager:(CLLocationManager *)manager
       didUpdateHeading:(CLHeading *)newHeading
{
    NSLog(@"%@", newHeading);
}

- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error
{
    NSLog(@"Could not find location: %@", error);
}

- (void)dealloc
{
    if( [locationManager delegate] == self)
        [locationManager setDelegate:nil];
}

- (void)applicationWillResignActive:(UIApplication *)application
{
    /*
     Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
     Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
     */
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    /*
     Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
     If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
     */
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    /*
     Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
     */
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    /*
     Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
     */
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    /*
     Called when the application is about to terminate.
     Save data if appropriate.
     See also applicationDidEnterBackground:.
     */
}

@end

推荐答案

将NSObject的一个实例拖到你的.xib中，然后将其放入Objects部分，就像你所获得的指令一样。然后选择它并在身份检查器中更改其类型（在右侧，它显示Custom Class）到MOCAppDelegate（或您喜欢的任何类别）。

Drag an instance of NSObject into your .xib and drop it in the Objects section just as in the instructions you've got. Then select it and change its type in the identity inspector (on the right side, where it says "Custom Class") to "MOCAppDelegate" (or whatever class you like).

这篇关于Xcode Interface Builder未显示App Delegate对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！