问题
I'm new to ios development and to stackoverflow. I did try searching both stackoverflow and google before posting.
I built a simple little app, originally just left it an iphone only app, but decided to make it universal in the end. I, stupidly, was messing around when i was getting to know xcode 4 and switched it to universal and then back again so i had to recopy the project and do it again. This time i started it with a universal app. (Not when i created it but after i went to project and selected it there) It created the ipad folder and mainwindow-ipad.xib file but was empty of course since i didn't do anything yet. I had it set up as a tabbed based app so my iphone version had firstview and secondview nib files also, but the ipad version didn't. I set it all up in iphone version first and it worked fine. I then went and laid down the ipad version (i did eliminate the second tab from mainwindow-ipad because i didn't need it)
i then went and created a new nib file and placed it in the ipad folder along with "main-ipad.h" and "main-ipad.m". I copied my code and connected everything and it runs fine on ipad simulator but now when i try and run iphone simulator i get "SIGABRT error. I took a screen shot of it. I don't fully understand objective-c so i was hoping someone can help me? I can post any code or whatever you might need to help me with this error so just ask.
Appreciate any help and suggestions you may have!
Thanks!
[Okay i would have posted image but I can't since I'm a new user, instead i posted the line highlighted and the output from xcode]
Code for file with error:
int main(int argc, char *argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, nil); //ERROR IS ON THIS LINE <-----
[pool release];
return retVal;
}
[OUTPUT]
2011-06-18 17:32:43.980 Price Assist[445:207] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x4e09cc0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key finallabel.'
*** Call stack at first throw:
(
0 CoreFoundation 0x00dc35a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f17313 objc_exception_throw + 44
2 CoreFoundation 0x00dc34e1 -[NSException raise] + 17
3 Foundation 0x00795677 _NSSetUsingKeyValueSetter + 135
4 Foundation 0x007955e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
5 UIKit 0x0021130c -[UIRuntimeOutletConnection connect] + 112
6 CoreFoundation 0x00d398cf -[NSArray makeObjectsPerformSelector:] + 239
7 UIKit 0x0020fd23 -[UINib instantiateWithOwner:options:] + 1041
8 UIKit 0x00211ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
9 UIKit 0x000c7628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
10 UIKit 0x000c5134 -[UIViewController loadView] + 120
11 UIKit 0x000c500e -[UIViewController view] + 56
12 UIKit 0x00038d42 -[UIWindow addRootViewControllerViewIfPossible] + 51
13 Foundation 0x007955e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
14 UIKit 0x00048ff6 -[UIView(CALayerDelegate) setValue:forKey:] + 173
15 UIKit 0x0021130c -[UIRuntimeOutletConnection connect] + 112
16 CoreFoundation 0x00d398cf -[NSArray makeObjectsPerformSelector:] + 239
17 UIKit 0x0020fd23 -[UINib instantiateWithOwner:options:] + 1041
18 UIKit 0x00211ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
19 UIKit 0x0001717a -[UIApplication _loadMainNibFile] + 172
20 UIKit 0x00017cf4 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 291
21 UIKit 0x00022617 -[UIApplication handleEvent:withNewEvent:] + 1533
22 UIKit 0x0001aabf -[UIApplication sendEvent:] + 71
23 UIKit 0x0001ff2e _UIApplicationHandleEvent + 7576
24 GraphicsServices 0x00ffc992 PurpleEventCallback + 1550
25 CoreFoundation 0x00da4944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
26 CoreFoundation 0x00d04cf7 __CFRunLoopDoSource1 + 215
27 CoreFoundation 0x00d01f83 __CFRunLoopRun + 979
28 CoreFoundation 0x00d01840 CFRunLoopRunSpecific + 208
29 CoreFoundation 0x00d01761 CFRunLoopRunInMode + 97
30 UIKit 0x000177d2 -[UIApplication _run] + 623
31 UIKit 0x00023c93 UIApplicationMain + 1160
32 Price Assist 0x000029a9 main + 121
33 Price Assist 0x00002925 start + 53
)
terminate called after throwing an instance of 'NSException'
iPhone FirstView nib file .h code:
@interface FirstViewController : UIViewController {
IBOutlet UITextField *dollarinput;
IBOutlet UITextField *centsinput;
IBOutlet UIButton *combinevalue;
IBOutlet UITextField *percentoffinput;
IBOutlet UILabel *discountlabel;
IBOutlet UILabel *finallabel;
}
- (IBAction)calculate:(id)sender;
- (IBAction)backgroundTouched:(id)sender;
- (IBAction)autonext:(id)sender;
iPhone FirstView nib file .m code:
//
// FirstViewController.m
// Price Assist
//
// Created by Dustin Schreiber on 6/15/11.
// Copyright 2011 TheTechSphere.com. All rights reserved.
//
#import "FirstViewController.h"
@implementation FirstViewController
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
*/
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload
{
[percentoffinput release];
percentoffinput = nil;
[discountlabel release];
discountlabel = nil;
[finallabel release];
finallabel = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc
{
[percentoffinput release];
[discountlabel release];
[finallabel release];
[super dealloc];
}
- (IBAction)calculate:(id)sender {
if ([centsinput.text length] == 0){
centsinput.text = @"00";
}
if ([dollarinput.text length] == 0){
dollarinput.text = @"00";
}
if ([percentoffinput.text length] == 0){
percentoffinput.text = @"00";
}
double cDollars = [dollarinput.text doubleValue];
double cCents = [centsinput.text doubleValue];
double percentoff = [percentoffinput.text doubleValue] / 100;
NSString *ccDollars = [[NSNumber numberWithFloat:cDollars] stringValue];
NSString *ccCents = [[NSNumber numberWithFloat:cCents] stringValue];
NSString *placeholder = [NSString stringWithFormat:@"%@.%@", ccDollars, ccCents];
double combined = [placeholder doubleValue];
double discount = combined * percentoff;
NSString *discountholder2 =[NSString stringWithFormat:@"%.2f", discount];
discountlabel.text = discountholder2;
double newprice = (combined - discount);
NSString *str = [NSString stringWithFormat:@"%.2f", newprice];
finallabel.text = str;
dollarinput.text = ccDollars;
centsinput.text = ccCents;
percentoffinput.text = [[NSNumber numberWithFloat:percentoff] stringValue];
}
-(IBAction)backgroundTouched:(id)sender
{
[dollarinput resignFirstResponder];
[centsinput resignFirstResponder];
[percentoffinput resignFirstResponder];
}
- (IBAction)autonext:(id)sender {
if ([centsinput.text length ] >= 2) {
if ([centsinput.text length] > 2) {
centsinput.text = @"";
} else {
//next field
}
}
}
@end
Thanks again! If anyone has any suggestions for my code i'd love to here them! Like I said, I'm new to it and thats the only way i know to do this.
------------> If anyone wants, I'll upload the entire project folder. Just ask. Thank you guys for all the help. i'm a n00b with xcode so i haven't got it all down yet.
Project Zipped
回答1:
Post some code where you use finallabel and try to debug your app so you can tell me the line just before the app crashes.
Option 2: Try to set a BreakPoint in malloc_error_break so we can have more info about the error.
In XCode go to Run -> Show -> BreakPoints (or just cmd + option + B). Then double click to add a new symbol (symbolic breakpoint) and type in malloc_error_break then press enter.
Now run your app and paste your console text.
UPDATE If you need help http://developer.apple.com/library/mac/#recipes/xcode_help-breakpoint_navigator/articles/adding_a_symbolic_breakpoint.html
Check your connections inside your InterfaceBuilder, you may have it wrong with fianllabel. Also check your Custom Class -> Class in your iphone XIB in your InterfaseBuilder
UPDATE
Go to Product -> Clean. Then Run.
回答2:
The line UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); just means that an exception was thrown during the running of your program. This could range from a memory problem, to a simple runtime error. Look in the target debugger console; it will tell you where the error occurred.
Open "iOS Simulator" Menu in the upper left->Reset Content and Settings. Then quit the iOS simulator and Xcode, and then restart your computer. This will get rid of the other instance of the process.
This May work it's work for me...........
回答3:
The problem is with your XIB file. This error generally occurs when your finalLabel is incorrectly hooked up or doesn't exist anymore. Check your connections in the Interface Builder once.
回答4:
I also had this error. After spending so much time, I found how to fix it. First of all go the console and see where is the error (mine was related to storyboards and its code) The way I fixed my error was by going in story board. Below the iPhone screen, there will be small yellow button. Right click on it and you will see that is causing error. Delete(x) it if there is yellow error sign.
If this does not fix your error then try to make new project and then replace its blank files with old files of your old project. I had same error in very beginning and by doing this program run without any error.
Other people suggests by restarting your laptop and running it again, reseting the iOS simulator, or changing iOS debugger (however this does not work in latest x code since there is only one debugger)
Hope this helps
来源：https://stackoverflow.com/questions/6398649/xcode-4-and-sigabrt-error-only-for-iphone-though