我正在尝试使用Interface Builder编译和运行一个Objective C应用的简单教程。我正在使用Xcode 4.0.2，并在iOS（iPhone）4.3上进行模拟。
错误信息：
当我构建项目时，它能够正常构建，但一旦应用程序尝试运行，就会崩溃并显示以下错误信息：
int main(int argc, char *argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"SimpleUIAppDelegate");
[pool release];
return retVal;
}
我在第4行遇到了错误：int retVal = UI... Thread 1: Program Received Signal "SIGABRT"。
如果这个项目的其他文件需要上传以便更清晰地理解，我可以做到。
谢谢！
编辑：
SimpleUIViewController.h:
#import <UIKit/UIKit.h>
@interface SimpleUIViewController : UIViewController <UITextFieldDelegate> {
UITextField *textInput;
UILabel *label;
NSString *name;
}
@property (nonatomic, retain) IBOutlet UITextField *textInput;
@property (nonatomic, retain) IBOutlet UILabel *label;
@property (nonatomic, copy) NSString *name;
- (IBAction)changeGreeting:(id)sender;
@end
SimpleUIViewController.m:
#import "SimpleUIViewController.h"
@implementation SimpleUIViewController
@synthesize textInput;
@synthesize label;
@synthesize name;
- (IBAction)changeGreeting:(id)sender {
self.name = textInput.text;
NSString *nameString = name;
if([nameString length] == 0) {
nameString = @"Inigo Montoya";
}
NSString *greeting = [[NSString alloc]
initWithFormat:@"Hello, my name is %@!", nameString];
label.text = greeting;
[greeting release];
}
- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
if(theTextField == textInput) {
[textInput resignFirstResponder];
}
return YES;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Release anything that's not essential, such as cached data
}
- (void)dealloc {
[textInput release];
[label release];
[name release];
[super dealloc];
}
@end
错误信息：
This GDB was configured as "x86_64-apple-darwin".Attaching to process 2668.
2011-06-09 11:20:21.662 InterfaceBuilder[2668:207] Unknown class InterfaceBuilderAppDelegate_iPhone in Interface Builder file.
2011-06-09 11:20:21.666 InterfaceBuilder[2668:207] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIApplication 0x4b1a900> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key textInput.'
*** Call stack at first throw:
(
0 CoreFoundation 0x00dc25a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f16313 objc_exception_throw + 44
2 CoreFoundation 0x00dc24e1 -[NSException raise] + 17
3 Foundation 0x00794677 _NSSetUsingKeyValueSetter + 135
4 Foundation 0x007945e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
5 UIKit 0x0021030c -[UIRuntimeOutletConnection connect] + 112
6 CoreFoundation 0x00d388cf -[NSArray makeObjectsPerformSelector:] + 239
7 UIKit 0x0020ed23 -[UINib instantiateWithOwner:options:] + 1041
8 UIKit 0x00210ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
9 UIKit 0x0001617a -[UIApplication _loadMainNibFile] + 172
10 UIKit 0x00016cf4 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 291
11 UIKit 0x00021617 -[UIApplication handleEvent:withNewEvent:] + 1533
12 UIKit 0x00019abf -[UIApplication sendEvent:] + 71
13 UIKit 0x0001ef2e _UIApplicationHandleEvent + 7576
14 GraphicsServices 0x00ffb992 PurpleEventCallback + 1550
15 CoreFoundation 0x00da3944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
16 CoreFoundation 0x00d03cf7 __CFRunLoopDoSource1 + 215
17 CoreFoundation 0x00d00f83 __CFRunLoopRun + 979
18 CoreFoundation 0x00d00840 CFRunLoopRunSpecific + 208
19 CoreFoundation 0x00d00761 CFRunLoopRunInMode + 97
20 UIKit 0x000167d2 -[UIApplication _run] + 623
21 UIKit 0x00022c93 UIApplicationMain + 1160
22 InterfaceBuilder 0x000027ff main + 127
23 InterfaceBuilder 0x00002775 start + 53
24 ??? 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
sharedlibrary apply-load-rules all
Current language: auto; currently objective-c
(gdb)
我是obj-c的新手，对于那个错误信息完全不知所措。有人能帮忙吗？