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最新推荐文章于 2024-09-28 07:26:17 发布

最新推荐文章于 2024-09-28 07:26:17 发布 · 80 阅读

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本文介绍了一个简单的iOS应用，用于实现华氏温度与摄氏温度之间的转换。该应用使用UIKit进行界面设计，并通过一个ViewController来展示输入框及按钮。用户可以在输入框中输入华氏温度，点击“Convert”按钮后，应用将显示对应的摄氏温度。

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[code]

//
// 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RootViewController
UINavigationController *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];
}

@end

int main(int argc, char *argv[])
{
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, @"converDelegate");
}
}

[/code]