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上进行模拟

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

当我构建项目时，它构建正常但是一旦应用程序尝试运行它就崩溃了：

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行得到错误：int retVal = UI ...线程1：程序接收信号“SIGABRT”。

如果为了清楚起见需要发布此项目的其他文件，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

错误讯息：

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，并且完全不知道我正在查看有关该错误消息的内容。有什么帮助吗？

Answer 1

您的NIB / XIB文件中有错误。

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

Answer 2

您可能已经错误地将“文件所有者”的类型设置为SimpleUIViewController的xib中的UIViewController。请在身份检查器窗格中将其设置为SimpleUIViewController。

Answer 3

现在我明白了！你的崩溃报告说：

Unknown class InterfaceBuilderAppDelegate_iPhone

因此，您似乎将IB中的App Delegate设置为此类，但此类在您的项目中不可用。检查一下。要么拼错了类名，要么将相关的类添加到项目中。

很可能，您的文本字段已连接到此应用代理。

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

~~从教程看来你没有使用MainWindow.xib，我会说你的项目缺少运行正确的委托。尝试在main中进行此更改：~~

~~int retVal = UIApplicationMain（argc，argv，nil，@“SimpleUIAppDelegate”）;~~

~~如果我的假设是对的，那应该会让你前进。~~

Answer 4

要修复它，请在Interface Builder中加载XIB，选择File Inspector选项卡，然后取消选中Use autolayout。或者，如果绝对必须使用自动布局，则可以定位iOS 6.0 + - 仅设备并更改最小目标。

NSLayoutConstraint SIGABRT on iPad

Answer 5

线程1程序收到信号sigabrt

有时NSString值会转到nill！

在您的应用程序初始化时可能会导致这种情况！

目标C，线程1程序接收信号SIGABRT

5 个答案: