将极其基本的objective-c程序连接到iPhone应用程序

Question

我想知道将我在objective-c中的这个简单控制台程序连接到非常简单的iPhone应用程序是否可行。

因为我没有使用Interface Builder的经验，所以我不确定需要多长时间来学习它。

此外，我相信我的代码必须调整到一些iPhone API，而不是使用控制台进行输入和输出。

下面是该程序的main.m文件，所有的代码都是商店：

//Simple program to convert Fahrenheit to Celsius and Celsius to Fahrenheit 

#import <stdio.h> 

@interface Converter: NSObject 
{ 
//Instance variable which stores converting formula for objects 
double formula; 
} 

//Declare instance methods for setting and getting instance variables 
-(void) convert: (double) expression; 
-(double) formula; 

@end 


@implementation Converter; 

//Define instance method to set the argument (expression) equal to the instance variable 
-(void) convert: (double) expression 
{ 
formula = expression; 
} 

//Define instance method for returning instance variable, formula 
-(double) formula 
{ 
return formula; 
} 

@end 

int main (int argc, char *argv[]) 
{ 

//Point two new objects, one for the Fahrenheit conversions and the other for the Celsius conversions, to the Converter class 
Converter *fahrenheitConversion = [[Converter alloc] init]; 
Converter *celsiusConversion = [[Converter alloc] init]; 

//Declare two double variables holding the user-inputted data, and one integer variable for the if else statement 
double fahrenheit, celsius; 
int prompt; 

NSLog(@"Please press 0 to convert Celsius to Fahrenheit, or 1 to convert Fahrenheit to Celsius\n "); 
scanf("%d", &prompt); 
if(prompt == 0) { 
    NSLog(@"Please enter a temperature in Celsius to be converted into Fahrenheit!:\n"); 
    scanf("%lf", &celsius); 
    if(celsius < -273.15) { 
     NSLog(@"It is impossible to convert temperatures less than −273.15 degrees Celsius, because this is absolute zero, the coldest possible temperature."); 
    } 
    else { 
     [fahrenheitConversion convert: (((((celsius)*9)/5)+32))]; 
     NSLog(@"%lf degrees Celsius is %lf Fahrenheit", celsius, [fahrenheitConversion formula]); 
    } 
} 

else { 
    NSLog(@"Please enter a temperature in Fahrenheit to be converted into Celsius!:\n"); 
    scanf("%lf", &fahrenheit); 
    if(fahrenheit < -459.67) { 
     NSLog(@"It is impossible to convert temperatures less than −459.67 degrees Fahrenheit, because this is absolute zero, the coldest possible temperature."); 
    } 
    else { 
     [celsiusConversion convert: ((((fahrenheit - 32)/9)*5))]; 
     NSLog(@"%lf degrees Fahrenheit is %lf Celsius", fahrenheit, [celsiusConversion formula]); 
    } 
} 

return 0; 
} 

Answer 1

这个怎么样？

我试图不要更改您的代码太多。它使用你原来的公式和转换器类，尽管我很想改变它。

截图：

alt text http://brockwoolf.com/shares/stackoverflow/3443063/tempcalc-iphone.png

• 下载Xcode project zipped（29KB）

源代码：

视图控制器接口：

#import <UIKit/UIKit.h> 

@interface TempCalc_iPhoneViewController : UIViewController { 

    UITextField *celciusTextField; 
    UITextField *fahrenheitTextField; 
    UILabel  *statusLabel; 

    double minFahrenheit; 
    double minCelcius; 

    NSString *normalStatus; 
    NSString *belowFahrenheitMessage; 
    NSString *belowCelciusMessage; 
} 

@property (nonatomic,retain) IBOutlet UITextField *celciusTextField; 
@property (nonatomic,retain) IBOutlet UITextField *fahrenheitTextField; 
@property (nonatomic,retain) IBOutlet UILabel *statusLabel; 

- (IBAction) convertCelciusToFahrenheit:(UITextField*)sender; 
- (IBAction) convertFahrenheitToCelcius:(UITextField*)sender; 

@end 

视图控制器实现

#import "TempCalc_iPhoneViewController.h" 
#import "Converter.h" 

@implementation TempCalc_iPhoneViewController 

@synthesize celciusTextField, fahrenheitTextField, statusLabel; 

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

    minCelcius = -273.15; 
    minFahrenheit = -459.67; 

    normalStatus = @"Please type to convert temperature"; 
    belowFahrenheitMessage = @"impossible to convert temperatures less than −459.67 degrees Fahrenheit"; 
    belowCelciusMessage = @"impossible to convert temperatures less than −273.15 degrees Celsius"; 
} 

// Delegate method 
- (BOOL)textFieldShouldReturn:(UITextField *)theTextField 
{ 
    NSLog(@"User pressed the DONE button on the keyboard (any keyboard!)"); 
    [theTextField resignFirstResponder]; 
    return YES; 
} 

- (IBAction) convertCelciusToFahrenheit:(UITextField*)sender 
{ 
    Converter *celciusConversion = [[Converter alloc] init]; 
    double celcius = [sender.text doubleValue]; 

    if(celcius < minCelcius) { 
     NSLog(@"It is impossible to convert temperatures less than −273.15 degrees Celsius, because this is absolute zero, the coldest possible temperature."); 
     self.statusLabel.text = belowCelciusMessage; 
    } 
    else 
    { 
     [celciusConversion convert: ((((celcius)*9)/5)+32)]; 
     NSString *fahrenheitValue = [NSString stringWithFormat:@"%lf", [celciusConversion formula]]; 
     NSLog(@"%lf degrees Celsius is %@ Fahrenheit", celcius, fahrenheitValue); 
     self.fahrenheitTextField.text = fahrenheitValue; 
     self.statusLabel.text = normalStatus; 
    } 

    [celciusConversion release]; 
} 

- (IBAction) convertFahrenheitToCelcius:(UITextField*)sender 
{ 
    Converter *fahrenheitConversion = [[Converter alloc] init]; 
    double fahrenheit = [sender.text doubleValue]; 

    if(fahrenheit < minFahrenheit) { 
     NSLog(@"It is impossible to convert temperatures less than −459.67 degrees Fahrenheit, because this is absolute zero, the coldest possible temperature."); 
     self.statusLabel.text = belowFahrenheitMessage; 
    } 
    else { 
     [fahrenheitConversion convert: (((fahrenheit - 32)/9)*5)]; 
     NSString *celciusValue = [NSString stringWithFormat:@"%lf", [fahrenheitConversion formula]]; 
     NSLog(@"%lf degrees Fahrenheit is %@ Celsius", fahrenheit, celciusValue); 
     self.celciusTextField.text = celciusValue; 
     self.statusLabel.text = normalStatus; } 

    [fahrenheitConversion release]; 
} 

Answer 2

移植应该是很简单的。 Apple提供了一些很好的示例应用你最快的成功之路可能是下载一个简单的文本框+按钮样本并添加你的计算。不包括下载和安装所需的时间将在1-2个小时内完成。

祝你好运！