Objective C，线程 1 程序接收信号 SIGABRT

Question

我正在尝试使用 Interface Builder 编译和运行 Objective C 应用程序的简单教程。我正在使用 Xcode 4.0.2 并在 iOS (iPhone) 4.3

http 上进行模拟://www.switchonthecode.com/tutorials/creating-your-first-iphone-application-with-interface-builder

当我构建项目时，它构建得很好，但是一旦应用程序尝试运行它崩溃：

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 行收到错误：int retVal = UI... 线程 1：程序收到信号“SIGABRT”。

如果为了清楚起见需要发布该项目的其他文件，我可以这样做。

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

错误消息：

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 新手，并且完全不知道我在查看该错误消息。有什么帮助吗？

Answer 1

您的 NIB/XIB 文件中有错误。

看起来您之前已附加了 IBOutlet (textInput)，但现在连接已断开。您应该仔细检查 Interface Builder 中的所有连接。

Answer 2

您可能在 SimpleUIViewController 的 xib 中将“文件所有者”的类型错误地设置为 UIViewController。请在身份检查器窗格中将其设置为 SimpleUIViewController 。

Answer 3

现在我看到了！你的崩溃报告说：

Unknown class InterfaceBuilderAppDelegate_iPhone

所以，看来你将IB中的App Delegate设置为此类，但该类在你的项目中不可用。检查一下。您可能拼写错误了类名，或者您应该将相关类添加到您的项目中。

您的文本字段很可能已连接到此应用程序委托。

您是否已将 Interface Builder 中的文本字段连接到 SimpleUIViewController 插座？

由于从教程中看来您没有使用 MainWindow.xib，所以我会说您的项目缺少运行适当的委托。尝试在您的 main 中进行此更改：

int retVal = UIApplicationMain(argc, argv, nil, @"SimpleUIAppDelegate");

如果我的假设是正确的，那应该会推动您前进.

Answer 4

要修复此问题，请在 Interface Builder 中加载 XIB，选择“文件检查器”选项卡，然后取消选中“使用自动布局”。或者，如果您绝对必须具有自动布局，则可以针对仅限 iOS 6.0+ 的设备并更改最小目标。

iPad 上的 NSLayoutConstraint SIGABRT

Answer 5

线程1程序

有时收到singal sigabrt，NSString值变为nil！

这可能会在您的应用程序初始化时导致这种情况！