iphone的Obj-C程序中的Exc_Arithmetic问题

Question

我正在编写一个带有 UIImageView 的程序。但是，我遇到了错误：Exc_Arithmetic。

这是我的实现：

#import "SalaatAppViewController.h"

@implementation SalaatAppViewController

@synthesize imageView;
@synthesize pauseButton;
@synthesize playButton;
@synthesize nextButton;

-(IBAction)pushPauseButton {
    [imageView stopAnimating];
}

-(IBAction)pushPlayButton {
    [imageView startAnimating];
}

- (IBAction)pushNextButton {

    imagesIndex = (imagesIndex + 1) % [images count];
    imageView.image = [images objectAtIndex:imagesIndex];

}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    imageView.animationImages = [[NSArray arrayWithObjects:
                                 [UIImage imageNamed:@"1.png"],
                                 [UIImage imageNamed:@"2.png"],
                                 [UIImage imageNamed:@"3.png"],
                                  nil] retain];
    UIImage *image = [UIImage imageNamed: @"2.png"];
    [imageView setImage:image];
    imageView.animationDuration = 1.00;
    imageView.animationRepeatCount = 0;
    [imageView startAnimating];
    imagesIndex = 0;
    imageView.image = [images objectAtIndex:imagesIndex];
    [super viewDidLoad];
    [self.view addSubview:imageView];

}


- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

-(void) dealloc {
    [imageView release];
    [pauseButton release];
    [playButton release];
    [nextButton release];
    [super dealloc];

}

@end

我的标题：

#import <UIKit/UIKit.h>

@interface SalaatAppViewController : UIViewController {
    UIImageView *imageView;
    UIButton *pauseButton;
    UIButton *playButton;
    UIButton *nextButton;
    NSUInteger images;
    NSUInteger imagesIndex;
}

@property (nonatomic, retain) IBOutlet UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UIButton *pauseButton;
@property (nonatomic, retain) IBOutlet UIButton *playButton;
@property (nonatomic, retain) IBOutlet UIButton *nextButton;


-(IBAction)pushPauseButton;
-(IBAction)pushPlayButton;
-(IBAction)pushNextButton;

@end

程序运行，但出现 9 个警告和 1 个错误。另外，当我按下下一个按钮时，它会崩溃。请帮忙！

Answer 1

异常表明你试图除以 0。这个表达式做了一个模数 (%) 函数，它返回除法后的余数，可能 [images count] 为 0：

imagesIndex = (imagesIndex + 1) % [images count];

Answer 2

你永远不会初始化images。另外，当您调用count 方法时，它似乎应该是NSArray 而不是NSUInteger。

Answer 3

Ahmad 你的“images”属性不应该是 NSUInteger 而是 NSArray*。定义如下：

NSArray *images;

按照我之前的指导，您似乎更换了太多东西。 =)