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POhow to update a string variable with another string variable
 

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  1. POhow to update a string variable with another string variable
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    <p>i have a string declare as such</p> <pre><code>NSString *str = [[NSString alloc] initWithFormat:@"I require an average GPA of at least %.2f to achieve my Goal of %@ this semester - NTU GPA Calculator", pgagoal,(NSString *)[myPickerDelegate.myGoal objectAtIndex: [myPicker selectedRowInComponent:0]]]; </code></pre> <p>i declared a global variable</p> <pre><code>NSStrinng *tweetString </code></pre> <p>and wants to copy the the string in str to tweetString. how should i copy it? since both are pointers, i tried:</p> <pre><code>tweetString = str; </code></pre> <p>or</p> <pre><code>tweetString = [NSString stringWithFormat:@"%@", str]; </code></pre> <p>but it doest work.</p> <hr> <p>EDIT: my code:</p> <pre><code>-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex1{ NSLog(@"buttonindex 1 clicked"); NSString *str2; NSLog(@"tweetString before if: %@", tweetString); if (pgagoal &lt; 0) { NSString *str2 = [[NSString alloc] initWithFormat:@"Confirm, Guarantee, Chop and Stamp! I can achieve my Goal of %@ this semester - NTU GPA Calculator", (NSString *)[myPickerDelegate.myGoal objectAtIndex: [myPicker selectedRowInComponent:0]]]; NSLog(@"tweetString: &lt; 0 %@", str2); } else if (pgagoal &gt; 5){ NSString *str2 = [[NSString alloc] initWithFormat:@"Its impossible!, i need an average GPA of at least %.2f to achieve %@ this semester - NTU GPA Calculator", pgagoal,(NSString *)[myPickerDelegate.myGoal objectAtIndex: [myPicker selectedRowInComponent:0]]]; NSLog(@"tweetString: &gt;5 %@", str2); } else{ NSString *str2 = [[NSString alloc] initWithFormat:@"I require an average GPA of at least %.2f to achieve my Goal of %@ this semester - NTU GPA Calculator", pgagoal,(NSString *)[myPickerDelegate.myGoal objectAtIndex: [myPicker selectedRowInComponent:0]]]; NSLog(@"tweetString with else: %@", str2); } //did i update tweetString correctly? tweetString = [NSString stringWithString:str2]; &lt;-- stop working from this point EXC_BAD_ACCESS NSLog(@"tweetString after if else: %@", tweetString); [self sendEasyTweet:tweetString]; NSLog(@"tweetString: %@", tweetString); [str2 release]; } - (void)sendEasyTweet { // Set up the built-in twitter composition view controller. TWTweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init]; // Set the initial tweet text. See the framework for additional properties that can be set. [tweetViewController setInitialText:tweetString]; // Create the completion handler block. [tweetViewController setCompletionHandler:^(TWTweetComposeViewControllerResult result) { switch (result) { case TWTweetComposeViewControllerResultCancelled: // The cancel button was tapped. NSLog(@"Tweet cancelled"); break; case TWTweetComposeViewControllerResultDone: // The tweet was sent. NSLog(@"Tweet done"); break; default: break; } // Dismiss the tweet composition view controller. [self dismissModalViewControllerAnimated:YES]; }]; // Present the tweet composition view controller modally. [self presentModalViewController:tweetViewController animated:YES]; } </code></pre> <p>EDIT2: Debbuger output:</p> <pre><code>2011-12-29 09:54:22.963 GPA[487:707] buttonindex 1 clicked 2011-12-29 09:54:22.966 GPA[487:707] tweetString before if: NTU GPA Calculator &lt;-- i init the string at viewDidLoad 2011-12-29 09:54:22.968 GPA[487:707] tweetString with else: I require an average GPA of at least 1.56 to achieve my Goal of Third Class Honors this semester - NTU GPA Calculator (gdb) </code></pre> <p>EDIT3: my tweetString is declared in view controller.h as</p> <pre><code> @interface GPAMainViewController : UIViewController &lt;GPAFlipsideViewControllerDelegate&gt;{ UIPickerView * myPicker; GPAAppDelegate * myPickerDelegate; IBOutlet UITextField *txtGPA; IBOutlet UITextField *txtTotalAU; IBOutlet UITextField *txtRemainingAU; double pgagoal; NSString *tweetString; } @property (nonatomic, retain) IBOutlet UIPickerView * myPicker; @property (nonatomic, retain) IBOutlet GPAAppDelegate *myPickerDelegate; @property (nonatomic, retain) UITextField *txtGPA; @property (nonatomic, retain) UITextField *txtTotalAU; @property (nonatomic, retain) UITextField *txtRemainingAU; @property (nonatomic, retain) NSString *tweetString; -(IBAction)finishEditing:(id)sender; -(IBAction)calculateGoal: (id) sender; -(IBAction)showInfo:(id)sender; -(IBAction)nextField:(id)sender; -(IBAction)resetField:(id)sender; -(void)sendEasyTweet:(id)sender; </code></pre>
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    1. USat0m87
    1. USat0m87
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    1. COBoth assignments should work. In what way does it not work? compile error?
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      1. POhow to update a string variable with another string variable
      1. USMattias Wadman
    2. COhi mattias, i have the post with a segment of my code plus the error i received..
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      1. USat0m87
    3. COThis is homework, yes?
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      1. POhow to update a string variable with another string variable
      1. USJonathan Grynspan
 

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