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POiPhone app issue getting result of equation to display on screen
 

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  1. POiPhone app issue getting result of equation to display on screen
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    <p>So I'm trying to create an iphone app that does simple temperature conversion and when I run the code enter my number and hit submit nothing is displayed. I can't seem to find the problem here is my header file</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface ViewController : UIViewController @property (weak, nonatomic) IBOutlet UISegmentedControl *convtype; @property (weak, nonatomic) IBOutlet UITextField *inputtemp; @property (weak, nonatomic) IBOutlet UIButton *submit; @property (weak, nonatomic) IBOutlet UILabel *outputtemp; @end </code></pre> <p>Basically I have a UISegmentedController to select which conversion to do (0 is c to f and 1 is f to c)</p> <p>I have a text field inputtemp for the temperature to convert. Submit is the submit button and a UIlabel outputtemp is where I want the result to be displayed.</p> <p>Not quite sure where this is going wrong here is the rest of my code in the .m file</p> <pre><code>#import "ViewController.h" @interface ViewController () @end @implementation ViewController @synthesize convtype; @synthesize inputtemp; @synthesize submit; @synthesize outputtemp; - (void)viewDidLoad { inputtemp.keyboardType = UIKeyboardTypeDecimalPad; [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } </code></pre> <p>...</p> <pre><code>- (IBAction)submit:(id)sender { //defines input text float temperature = [[inputtemp text] floatValue]; float sum = 0; //selects formula based on convtype segment control if (convtype.selectedSegmentIndex == 0) { sum = (temperature * 9) / 5 + 32; } else if (convtype.selectedSegmentIndex == 1) { sum = (temperature - 32) * 9 / 5; } //outputs to screen [outputtemp setText:[NSString stringWithFormat:@"%3.2f", sum]]; } @end </code></pre> <p>Is the problem with the setText? I'm not quite sure how to manipulate the ui label</p>
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    1. USJoel Smith
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      1. VTDownMod
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      1. VTUpMod
    1. COYou don't say what exactly is the problem. Try putting some NSLog statements into the code so you'll se what's going on. For example put: `NSLog (@"should set output: %3.2f", sum);` in front of `[outputtemp setText:...];` Though it looks like you forgot to connect corresponding UILabel from IB with it's IB outlet in code.
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      1. USRok Jarc
    2. COmake sure you have connect all the IBOutlets in IB.
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      1. UShchouhan02
    3. COLog the value of sum and check if its not null.
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      1. USMalek_Jundi
 

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