溫度轉換不給輸出

Question

我已經寫了溫度轉換爲iPhone代碼，但它無法正常工作，並沒有給出任何錯誤，請幫助

接口部分

#import <UIKit/UIKit.h> 

float n ; 
float k; 



@interface farh_celcius_conv_AppDelegate : NSObject <UIApplicationDelegate> { 
    UIWindow *window; 
    UILabel *display; 
    IBOutlet UITextField *farhenite; 
    IBOutlet UIButton *convert; 

} 


-(IBAction) convert; 


@property (nonatomic, retain) IBOutlet UIWindow *window; 
@property (nonatomic, retain) IBOutlet UILabel *display; 
@property (nonatomic, retain) IBOutlet UITextField *farhenite; 
@property (nonatomic, retain) IBOutlet UIButton *convert; 
@end 

實現部分

#import "farh_celcius_conv_AppDelegate.h" 


@implementation farh_celcius_conv_AppDelegate 


@synthesize window,display,farhenite; 





-(IBAction) convert { 

    NSString *str = [NSString text]; 

    float n = [str floatValue]; 


     k = (n - 32)*(5/9); 



    [display setText:[NSString stringWithFormat:@"%f",k]]; 

} 

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

    // Override point for customization after application launch 
    [window makeKeyAndVisible]; 
} 


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


@end 

Answer 1

如果你想在文本框輸入的數值轉換成你的方法應該是這樣的

-(IBAction) convert { 

    NSString *str = yourTextField.text; // In your case farhenite i guess 

    float n = [str floatValue]; 


     k = (n - 32)*(5/9); 



    [display setText:[NSString stringWithFormat:@"%f",k]]; 

} 

Answer 2

NSString *str = display.text; 

只需更換str聲明即可。

Answer 3

，如果你婉從文本框轉換，那麼它應該是

NSString *str = textField.text; 

Answer 4

替換爲你的函數低於功能。 比它會正常工作。

- （IBAction爲）將{

NSString *str = display.text; 

float n = [str floatValue]; 


    k = (n - 32)*(5/9); 



[display setText:[NSString stringWithFormat:@"%f",k]]; 

}

Answer 5

如果你想從farhenite文本字段轉換價值，那麼它應該是

-(IBAction) convert { 

    NSString *str = farhenite.text; 

    float n = [str floatValue]; 


     k = (n - 32)*(5/9); 



    [display setText:[NSString stringWithFormat:@"%f",k]]; 

}