ios iphone/ipad Dev 學習筆記 (A-01) HelloWorld w/o xib

自古以來，不管是在那個作業系統平台，應用軟體如果要讓畫面與眾不同，那就別指望光靠標準開發工具提供的元件就達到目的，幾乎都是要由開發人員使用較原始的程式庫來『客製』，我以這個方向來作第一個練習的目標。

環境：Xcode 4.2 + iOS SDK 5
目標：不使用 Interface Builder 建立 ViewController，並放進 一個 Label

說明：

• 啟動 Xcode4.2 ，建立新專案

• 在 Xcode 畫面最左側 HelloWorld 資料夾裡面再建一個 Group 來存放 class:

• 『New Group』rename 成為『Classes』

• 將 AppDelegate.h AppDelegate.m 兩個檔案移到 Classes 這個資料夾裏

接下來，建立 ViewController：

• 在 Classes(右鍵) -> New File, ios Cocoa Touch, UIViewController subclass
• Class: HomeViewController, 確認 『With XIB for user interface』沒有被選取
• 選擇存放程式專案的資料夾(跟前面『建立專案』同一個資料夾)->(creat)

以下是我的 code

---

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

---

AppDelegate.m

#import "AppDelegate.h"

#import "HomeViewController.h"

@implementation AppDelegate

@synthesize window = _window;

HomeViewController *homeViewController;

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

{

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    

//=========================================================================

    homeViewController = [[HomeViewController alloc] initWithNibName:nil bundle:nil];

    [self.window addSubview:homeViewController.view];

//=========================================================================

    

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

    return YES;

}

- (void)applicationWillResignActive:(UIApplication *)application

{

}

- (void)applicationDidEnterBackground:(UIApplication *)application

{

}

- (void)applicationWillEnterForeground:(UIApplication *)application

{

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{

}

- (void)applicationWillTerminate:(UIApplication *)application

{

}

@end

---

HomeViewController.h

#import <UIKit/UIKit.h>

@interface HomeViewController : UIViewController{

   

}

@property (nonatomic, strong) UILabel * label;

@end

---

HomeViewController.m

#import "HomeViewController.h"

@implementation HomeViewController

@synthesize label ;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)didReceiveMemoryWarning

{

    // Releases the view if it doesn't have a superview.

    [super didReceiveMemoryWarning];

    

    // Release any cached data, images, etc that aren't in use.

}

#pragma mark - View lifecycle

/*

// Implement loadView to create a view hierarchy programmatically, without using a nib.

- (void)loadView

{

}

*/

- (void)viewDidLoad

{

//=========================================================================

    //加一個 Label View

    CGRect frame = CGRectMake(20, 10, 280, 50);

    label = [[UILabel alloc] initWithFrame:frame];

    label.textAlignment = UITextAlignmentCenter;

    label.font = [UIFont fontWithName:@"Verdana" size:20];

    label.text = @"Hello World !!!!!!!!";

    

    [self.view addSubview:label];    

//=========================================================================

    [super viewDidLoad];

}

- (void)viewDidUnload

{

    [super viewDidUnload];

    // Release any retained subviews of the main view.

    // e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    // Return YES for supported orientations

    return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

@end