Question

尝试编译并运行此程序，但在控制台中收到此错误消息：

2012-02-23 11:43:53.949 touches_v3[8667:f803] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<ViewController 0x6aab1e0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key buttonShrink.'
*** First throw call stack:
(0x13bc052 0x154dd0a 0x13bbf11 0x9b3032 0x924f7b 0x924eeb 0x93fd60 0x23291a 0x13bde1a 0x1327821 0x23146e 0xd8e2c 0xd93a9 0xd95cb 0x39a73 0x39ce2 0x39ea8 0x40d9a 0x1f3b 0x119d6 0x128a6 0x21743 0x221f8 0x15aa9 0x12a6fa9 0x13901c5 0x12f5022 0x12f390a 0x12f2db4 0x12f2ccb 0x122a7 0x13a9b 0x1c42 0x1bb5)
terminate called throwing an exception(lldb)

这对我来说没有意义，因为虽然我在头文件中编写了“buttonShrink”作为对象，但我后来删除了它，并在实现文件中删除了对它的所有引用。标题或实现文件中没有错误或警告。

这是这两个的代码。头文件：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {

    IBOutlet UIImageView *myIcon;
    IBOutlet UIImageView *myBackground;
    IBOutlet UIButton *shrinkButton;

    NSArray *bgImages;
    int currentBackground;
    bool hasMoved;
    bool hasShrunk;

    CGAffineTransform translate;
    CGAffineTransform size;
    UIButton *move;

}

@property (nonatomic, retain)UIImageView *myIcon; 
@property (nonatomic, retain)UIImageView *myBackground;
@property (nonatomic, retain)NSArray *bgImages;
@property (nonatomic, retain)UIButton *shrinkButton;


- (IBAction)shrink:(id)sender;
- (IBAction)move:(id)sender;
- (IBAction)change:(id)sender;

@end

实施档案：

#import "ViewController.h"

@interface ViewController ()


@end

@implementation ViewController
@synthesize myIcon, myBackground, bgImages, shrinkButton;

- (void)viewDidLoad
{
    [super viewDidLoad];
hasMoved = NO;
    hasShrunk = NO;
    currentBackground = 0;

bgImages = [[NSArray alloc] initWithObjects:
            [UIImage imageNamed:@"wallPaper_01.png"],
             [UIImage imageNamed:@"wallPaper_02.png"],
             [UIImage imageNamed:@"wallPaper_03.png"],
             [UIImage imageNamed:@"wallPaper_04.png"],
             [UIImage imageNamed:@"wallPaper_05.png"],
             nil];


size = CGAffineTransformMakeScale(.25, .25);
    translate = CGAffineTransformMakeTranslation(0, -100);

myBackground.image = [bgImages objectAtIndex:currentBackground];

}

- (void)viewDidUnload
{
    [super viewDidUnload];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

- (void)dealloc {
    [myIcon release];
    [myBackground release];
    [shrinkButton release];
    [super dealloc];
}

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    if (CGRectContainsPoint([myIcon frame], [touch locationInView:nil]))
    {
        if(hasMoved == YES && hasShrunk == YES) {
            myIcon.transform = CGAffineTransformTranslate(size, 0, 0);
            hasMoved = 0;
        }
        if(hasMoved == YES && hasShrunk == NO) {
            myIcon.transform = CGAffineTransformMakeTranslation(0, 0);
            hasMoved = NO;
        }

        myIcon.center = [touch locationInView:nil];
    }
}
- (IBAction)shrink:(id)sender {
    if (hasShrunk) {
        [shrinkButton setTitle:@"Shrink" forState:UIControlStateNormal];
    } else {
        [shrinkButton setTitle:@"Grow" forState:UIControlStateNormal];

    }

    if (hasShrunk == NO && hasMoved == NO) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = size;
        [UIView commitAnimations];
        hasShrunk = YES;
    }

    else if (hasShrunk == NO && hasMoved == YES) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = CGAffineTransformScale(translate, .25, .25);
        [UIView commitAnimations];
        hasShrunk = YES;
    }

    else if (hasShrunk == YES && hasMoved == YES) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = CGAffineTransformScale(translate, 1, 1);
        [UIView commitAnimations];
        hasShrunk = YES;
    }

    if (hasShrunk == NO && hasMoved == NO) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = CGAffineTransformIdentity;
        [UIView commitAnimations];
        hasShrunk = YES;
    }

}

- (IBAction)move:(id)sender {

    if (hasMoved == NO && hasShrunk == NO) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = translate;
        [UIView commitAnimations];
        hasMoved = YES;
    }

    else if (hasMoved == NO && hasShrunk == YES) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = CGAffineTransformTranslate(size, 0, -100);
        [UIView commitAnimations];
        hasMoved = YES;
    }

    else if (hasMoved == YES && hasShrunk == YES) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = CGAffineTransformTranslate(size, 0, 0);
        [UIView commitAnimations];
        hasMoved = YES;
    }

    if (hasMoved == NO && hasShrunk == NO) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1.0];
        myIcon.transform = CGAffineTransformMakeTranslation(0,0);
        [UIView commitAnimations];
        hasMoved = YES;
    }

}

- (IBAction)change:(id)sender {
    currentBackground++;
    if (currentBackground >=[bgImages count])
    currentBackground = 0;

    [UIView beginAnimations:@"changeView" context:nil];
    [UIView setAnimationDuration:1];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

    if (currentBackground == 1) {
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:YES];
    }

    if (currentBackground == 2) {
        [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
    }

    if (currentBackground == 3) {
        [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
    }

    if (currentBackground == 4) {
        [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
    }

    [UIView commitAnimations];
    myBackground.image = [bgImages objectAtIndex:currentBackground];
}
@end

Answer 1

您可能在nib文件中引用了buttonShrink。看看IB。如果您不确定.xib文件的位置，可以对其进行grep。

Answer 2

InterfaceBuider中有一个按钮，该按钮链接到名为＆＃34; buttonShrink＆＃34;的动作。看起来您可能已在类中重命名该方法，但未更新InterfaceBuilder中的关联。

线程1：发出'SIGABRT'信号错误消息

2 个答案: