手工打造一個Viewer
//// main.m// //// Created by unknown on 12/6/1.// Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import <UIKit/UIKit.h>// 好用的列按鈕項目建立巨集#define BARBUTTON(TITLE, SELECTOR) [[UIBarButtonItem alloc] \initWithTitle:TITLE style:UIBarButtonItemStylePlain target:self \action:SELECTOR]//Step 5.a 設計一個ViewController@interface convertController:UIViewController{UITextField *field1;UITextField *field2;}-(IBAction)doConvert:(id)sender;@end@implementation convertController//Step 5.b 複寫loadView來佈置此ViewController的layerOut-(void)loadView{CGRect appFrame=[[UIScreen mainScreen]applicationFrame];//self.view=[[UIView alloc]initWithFrame:appFrame];field1 = [[UITextField alloc] initWithFrame: CGRectMake(185.0, 16.0, 97.0, 31.0)]; field1.borderStyle = UITextBorderStyleRoundedRect; field1.keyboardType = UIKeyboardTypeDecimalPad; field1.clearButtonMode = UITextFieldViewModeAlways; field2 = [[UITextField alloc] initWithFrame: CGRectMake(185.0, 72.0, 97.0, 31.0)]; field2.borderStyle = UITextBorderStyleRoundedRect; field2.enabled = NO; UILabel *label1 = [[UILabel alloc] initWithFrame: CGRectMake(95.0, 19.0, 82.0, 21.0)]; label1.text = @"Fahrenheit"; label1.textAlignment = UITextAlignmentLeft; label1.backgroundColor = [UIColor clearColor]; UILabel *label2 = [[UILabel alloc] initWithFrame: CGRectMake(121.0, 77.0, 56.0, 21.0)]; label2.text = @"Celsius"; label2.textAlignment = UITextAlignmentLeft; label2.backgroundColor = [UIColor clearColor]; // 將各元件加入內容視圖裡 [self.view addSubview:field1]; [self.view addSubview:field2]; [self.view addSubview:label1]; [self.view addSubview:label2];// 設定標題文字，加入Convert按鈕 self.title = @"Converter"; self.navigationItem.rightBarButtonItem = BARBUTTON(@"Convert", @selector(doConvert:)); }-(IBAction)doConvert:(id)sender{float invalue = [[field1 text] floatValue]; float outvalue = (invalue - 32.0f) * 5.0f / 9.0f; [field2 setText:[NSString stringWithFormat:@"%3.2f", outvalue]]; [field1 resignFirstResponder];}@end//=====================//Step 1.建立UIApplicationDelegaye class@interface converDelegate :NSObject<UIApplicationDelegate>{//Step 2.加入window 指標UIWindow *_window;}@end@implementation converDelegate//Step 3.複寫applicationDidFinishLaunching-(void)applicationDidFinishLaunching:(UIApplication *)application{//Step 4.構建window,並且保留在_window_window=[[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];//Step 5.建構一個UINavigationController,並且初始化一個converController 物件當做RootViewControllerUINavigationController *nc=[[UINavigationController alloc]initWithRootViewController:[[convertController alloc]init]];//Step 6.把nc挂入到window的Root[_window setRootViewController:nc];//Step 7.show window [_window makeKeyAndVisible];}@endint main(int argc, char *argv[]){@autoreleasepool { return UIApplicationMain(argc, argv, nil, @"converDelegate");}}