weird error when finish editing UITextField [closed] - ios

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This is what I get when I press the done button on the keyboard of a UITextField: (code to follow)
2013-10-14 23:22:55.170 What to where?[21627:a0b] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]'
*** First throw call stack:
(
0 CoreFoundation 0x0008e5e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x0178e8b6 objc_exception_throw + 44
2 CoreFoundation 0x00042a32 -[__NSArrayI objectAtIndex:] + 210
3 What to where? 0x00002670 -[ViewController getWeatherForecast] + 352
4 What to where? 0x00002430 -[ViewController textFieldDidEndEditing:] + 288
5 libobjc.A.dylib 0x017a081f -[NSObject performSelector:withObject:] + 70
6 UIKit 0x00502c8c -[UIApplication sendAction:to:from:forEvent:] + 108
7 UIKit 0x00502c18 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
8 UIKit 0x005fa6d9 -[UIControl sendAction:to:forEvent:] + 66
9 UIKit 0x005faa9c -[UIControl _sendActionsForEvents:withEvent:] + 577
10 UIKit 0x00bddaf3 -[UITextField _resignFirstResponder] + 300
11 UIKit 0x0065a71e -[UIResponder _finishResignFirstResponder] + 181
12 UIKit 0x0065a82f -[UIResponder resignFirstResponder] + 265
13 UIKit 0x00bdd894 -[UITextField resignFirstResponder] + 118
14 What to where? 0x000024d9 -[ViewController textFieldShouldReturn:] + 137
15 UIKit 0x00be68bf -[UITextField keyboardInput:shouldInsertText:isMarkedText:] + 357
16 UIKit 0x006d5a43 -[UIKeyboardImpl callShouldInsertText:] + 271
17 UIKit 0x006dfd20 -[UIKeyboardImpl addWordTerminator:afterSpace:elapsedTime:executionContext:] + 63
18 UIKit 0x006df81a -[UIKeyboardImpl completeAcceptCandidateBeforeAddingInput:executionContext:] + 1668
19 UIKit 0x006df0f6 __60-[UIKeyboardImpl addInputString:withFlags:executionContext:]_block_invoke + 53
20 UIKit 0x00c0dc6e -[UIKeyboardTaskExecutionContext returnExecutionToParent] + 254
21 UIKit 0x006e299b -[UIKeyboardImpl acceptCurrentCandidateIfSelectedWithExecutionContext:] + 250
22 UIKit 0x006df0b9 -[UIKeyboardImpl addInputString:withFlags:executionContext:] + 451
23 UIKit 0x006ddf7f -[UIKeyboardImpl handleStringInput:withFlags:executionContext:] + 248
24 UIKit 0x006ec16f -[UIKeyboardImpl handleKeyWithString:forKeyEvent:executionContext:] + 633
25 UIKit 0x006ebcb6 -[UIKeyboardImpl handleKeyEvent:executionContext:] + 1808
26 UIKit 0x006eb50f __33-[UIKeyboardImpl handleKeyEvent:]_block_invoke + 51
27 UIKit 0x006eb31c -[UIKeyboardImpl _handleKeyEvent:executionContext:] + 243
28 UIKit 0x008642e9 -[UIKeyboardLayoutStar completeRetestForTouchUp:timestamp:interval:executionContext:] + 4078
29 UIKit 0x00862def -[UIKeyboardLayoutStar touchUp:executionContext:] + 1545
30 UIKit 0x006f9398 __28-[UIKeyboardLayout touchUp:]_block_invoke + 269
31 UIKit 0x00c0e1b8 -[UIKeyboardTaskQueue continueExecutionOnMainThread] + 402
32 UIKit 0x00c0e85f -[UIKeyboardTaskQueue addTask:] + 144
33 UIKit 0x006f9283 -[UIKeyboardLayout touchUp:] + 263
34 UIKit 0x006f9db9 -[UIKeyboardLayout touchesEnded:withEvent:] + 362
35 UIKit 0x005400cd -[UIWindow _sendTouchesForEvent:] + 852
36 UIKit 0x00540d34 -[UIWindow sendEvent:] + 1232
37 UIKit 0x00514a36 -[UIApplication sendEvent:] + 242
38 UIKit 0x004fed9f _UIApplicationHandleEventQueue + 11421
39 CoreFoundation 0x000178af __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
40 CoreFoundation 0x0001723b __CFRunLoopDoSources0 + 235
41 CoreFoundation 0x0003430e __CFRunLoopRun + 910
42 CoreFoundation 0x00033b33 CFRunLoopRunSpecific + 467
43 CoreFoundation 0x0003394b CFRunLoopRunInMode + 123
44 GraphicsServices 0x036859d7 GSEventRunModal + 192
45 GraphicsServices 0x036857fe GSEventRun + 104
46 UIKit 0x0050194b UIApplicationMain + 1225
47 What to where? 0x00002d3d main + 141
48 libdyld.dylib 0x01fbf725 start + 0
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
The code in the .h :
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#interface ViewController : UIViewController <UITextFieldDelegate> {
NSString *location;
NSString *time;
}
#property (strong, nonatomic) IBOutlet UITextField *destinationTF;
#property (strong, nonatomic) IBOutlet UITextField *timeTF;
- (IBAction)textFieldDidEndEditing:(id)sender;
#end
And the .m:
#synthesize destinationTF, timeTF;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)textFieldDidEndEditing:(id)sender {
if (sender == destinationTF ) {
location = destinationTF.text;
} else if (sender == timeTF) {
time = timeTF.text;
}
[self getWeatherForecast];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
[destinationTF resignFirstResponder];
[timeTF resignFirstResponder];
return YES;
}

Answer 1

0x00042a32 -[__NSArrayI objectAtIndex:] + 210
I don't have the source code to your getWeatherForcast method, but I would guess that that array is empty. Before you execute any code on the array try:
if ([someArray lastObject]) {
..Do something
} else {
do something if the test fails
}
This is safe and will not crash because the array is out of bounds. (It just returns nil)
I think iOS 7 added firstObject as well.

Answer 2

The crash is due to an index out of bounds error and it is occurring in your getWeatherForecast method. You may be attempting to get an object out of an empty array...