这是我按下UITextField键盘上的完成按钮时得到的结果:(要遵循的代码）
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)
.h中的代码：
#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
而.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;
}
答案 0 :(得分：0)
崩溃是由于索引超出范围错误而导致的getWeatherForecast方法正在发生。您可能正在尝试从空数组中获取对象...
答案 1 :(得分：0)
0x00042a32 -[__NSArrayI objectAtIndex:] + 210
我没有getWeatherForcast方法的源代码，但我猜这个数组是空的。在对阵列执行任何代码之前，请尝试：
if ([someArray lastObject]) {
..Do something
} else {
do something if the test fails
}
这是安全的，不会崩溃，因为数组超出范围。 （它只返回零）
我认为iOS 7也添加了firstObject。