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POAssertion Failure in Calculator Program
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  1. POAssertion Failure in Calculator Program
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    copied!<p>So I'm working on a simple calculator program to get used to cocoa and objective C. I've redone the whole thing multiple times and every time I finish coding, the first time i build it, it works fine, but every time after that the window wont launch and it gives me these errors:</p> <pre><code>2013-01-11 10:32:14.760 Visual Caluclator Fix[39892:403] *** Assertion failure in -[NSTextFieldCell _objectValue:forString:errorDescription:], /SourceCache/AppKit/AppKit-1138.47/AppKit.subproj/NSCell.m:1564 2013-01-11 10:32:14.762 Visual Caluclator Fix[39892:403] Ignoring exception raised in __-[NSPersistentUIManager restoreAllPersistentStateWithTalagentWindows:registeringAsReadyWhenDone:completionHandler:]_block_invoke_3: Invalid parameter not satisfying: aString != nil </code></pre> <p>I've concluded that the problem lies in my textEdited method, because when I comment the code inside of it out, the program has no issues running; however, I have no idea why this is, or why it would run the first time and not any subsequent times. When I put in an exception breakpoint, it points me to the one line in the updateUI method and the call to [self updateUI] in the textEdited method. The following code is the textEdited method and the other methods it references.(I'm fairly sure there's nothing wrong with the solve method because I used it in a command prompt calculator and it worked great. Also, I know this is a pretty convoluted way to program a calculator, with the strings and everything, but I was just trying to integrate the code I already had for the command prompt program into a cocoa program.)</p> <p>In the AppDelegate class:</p> <pre><code>- (void)updateUI{ [self.calculationView setStringValue: self.calculation.calcString];//Exception breakpoint points here } - (IBAction)textEdited:(id)sender { self.calculation.calcString = self.calculationView.stringValue; [self.calculation solve]; [self updateUI];//Exception breakpoint points here } </code></pre> <p>In the Calculation class:</p> <pre><code>- (NSString*)solve{ for (int i = 0; i &lt; [self.calcString length]; i++) { NSRange nextChar = NSMakeRange(i, 1); if ([[self.calcString substringWithRange: nextChar] isEqualToString: @"*"]|| [[self.calcString substringWithRange: nextChar] isEqualToString: @"/"]) [self calcTerm: i]; } for (int i = 0; i &lt; [self.calcString length]; i++) { NSRange nextChar = NSMakeRange(i, 1); if ([[self.calcString substringWithRange: nextChar] isEqualToString: @"+"]|| [[self.calcString substringWithRange: nextChar] isEqualToString: @"-"]) [self calcTerm: i]; } return self.calcString; } </code></pre>
 

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