Programming Design Notes

第一個 iPhone 的 HelloWorld 程式，不用 5 分鐘就可以建立好，而且不用 Interface Builder 去制作是想令你更了解 UIView 的用法，因為用 Interface Builder 去制作可能會忽略了很多基礎的東西。

//
//  HelloWorldAppDelegate.h
//  HelloWorld
//
//  Created by LOK on 10年1月10日.
//  Copyright __MyCompanyName__ 2010. All rights reserved.
//

#import 

@interface HelloWorldAppDelegate : NSObject  {
    UIWindow *window;
    UIViewController *rootController;
}

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

@end

在 HelloWorldAppDelegate.m 輸入以下程式碼

//
//  HelloWorldAppDelegate.m
//  HelloWorld
//
//  Created by LOK on 10年1月10日.
//  Copyright __MyCompanyName__ 2010. All rights reserved.
//

#import "HelloWorldAppDelegate.h"
#import "HelloWorldController.h"

@implementation HelloWorldAppDelegate

@synthesize window;
@synthesize rootController;


- (void)applicationDidFinishLaunching:(UIApplication *)application {    

    //Create a custom UIViewController and assign to window attribte
    self.rootController = [[HelloWorldController alloc] init];
    [window addSubview:self.rootController.view];
    [window makeKeyAndVisible];
}


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


@end

不用在 HelloWorldController.h 輸入程式碼
在 HelloWorldController.m 輸入以下程式碼

//
//  HelloWorld.m
//  HelloWorld
//
//  Created by LOK on 10年1月10日.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "HelloWorldController.h"


@implementation HelloWorldController

/*
 // The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}
*/


// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
 //Create a UIView for this controller display 
 UIView *rootView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
 
 //Create a label for display "Hello World" text
 UILabel *labHelloWorld = [[UILabel alloc] initWithFrame:CGRectMake(100, 200, 100, 50)];
 
 //Set "Hello World" text to labHelloWorld
 labHelloWorld.text = @"Hello World";
 
 //Assign the rootView to this controller
 self.view = rootView;
 
 //Add label to controller view
 [self.view addSubview:labHelloWorld];
 
 //release object
 [rootView release];
 [labHelloWorld release];
}


/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (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.
}

- (void)viewDidUnload {
 // Release any retained subviews of the main view.
 // e.g. self.myOutlet = nil;
}


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


@end

現在可以按下 Build and run 去測試一下程式了。

執行畫面如下: