新手iPhone入門程序

思路：
1) Interface Builder製作界面
2) 頭文件中增加Outlet和事件響應函數
3) 建立界面與代碼的關聯
4) 添加實際代碼(初始化、按鍵響應等)

效果：

[img]http://dl.iteye.com/upload/attachment/502344/cba0f7eb-0f00-3c30-b32e-3ad240f47430.png[/img]

[img]http://dl.iteye.com/upload/attachment/502343/8f60dcc0-c9d8-339c-b60a-342d4cc92d86.png[/img]


代碼：

//
//  QuizAppDelegate.h
//  Quiz
//
//  Created by bruce.lin on 6/21/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface QuizAppDelegate : NSObject <UIApplicationDelegate> {

    int currentQuestionIndex;

    NSMutableArray *questions;
    NSMutableArray *answers;

    IBOutlet UILabel *questionField;
    IBOutlet UILabel *answerField;

    UIWindow *window;
}

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

-(IBAction) showQuestion:(id)sender;
-(IBAction) showAnswer:(id)sender;

@end

//
//  QuizAppDelegate.m
//  Quiz
//
//  Created by bruce.lin on 6/21/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "QuizAppDelegate.h"

@implementation QuizAppDelegate


@synthesize window=_window;


-(id)init
{
    [super init];
    questions=[[NSMutableArray alloc] init];
    answers=[[NSMutableArray alloc] init];

    [questions addObject:@"iPhone多少米？"];
    [answers addObject:@"爲啥告訴你"];

    [questions addObject:@"路邊野花不要採"];
    [answers addObject:@"一隻紅杏出牆來"];

    currentQuestionIndex=0;

    return self;
}


-(IBAction) showQuestion:(id)sender
{
    currentQuestionIndex++;

    if(currentQuestionIndex >= [questions count])
    {
        currentQuestionIndex=0;
    }

    [questionField setText:[questions objectAtIndex:currentQuestionIndex]];

    NSLog(@"Current question is: %@",[questions objectAtIndex:currentQuestionIndex]);

    [answerField setText:@"?"];
}

-(IBAction) showAnswer:(id)sender
{
    [answerField setText:[answers objectAtIndex:currentQuestionIndex]];
}


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    [self.window makeKeyAndVisible];
    return YES;
}

- (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:.
     */
}

- (void)dealloc
{
    [_window release];
    [super dealloc];
}

@end