按钮通过 ivars 方法获取 EXC_BAD_ACCESS

发布于 2024-12-13 20:14:07 字数 1549 浏览 1 评论 0原文

我是 obj-c 的新手，所以我无法理解其中的一些逻辑。我想了解我的代码和应用程序逻辑。我的应用程序是对 UIImageView 动画的简单示例进行修改：这是 .h （在基于标准视图的模板中）

#import <UIKit/UIKit.h>
@interface ImageAnimatorViewController : UIViewController {
    UIImageView *animImage;
}
@property (nonatomic, retain) IBOutlet UIImageView *animImage;
- (IBAction)startAnimation;
- (NSArray*)creatAnimation:(NSString*)fileName;
@end

这是 .m （没有标准 dealloc 和 viewDidUnload）

@synthesize animImage;
- (IBAction)startAnimation{
    [animImage startAnimating];
}    
- (void)viewDidLoad{
    [super viewDidLoad];

    animImage.animationImages = [self creatAnimation:@"Images.jpg"]; 
    animImage.animationDuration = 1.0f; 
    animImage.animationRepeatCount = 0; 
}    
- (NSArray*)creatAnimation:(NSString*)fileName{
    UIImage *image = [UIImage imageNamed:fileName];
    NSMutableArray *animationImages = [NSMutableArray array];
    for (int i = 0; i<8; i++) {
        CGImageRef imageRef = CGImageCreateWithImageInRect(image.CGImage, 
        CGRectMake(i*600.0f, 0.0f, 600.0f, 262.0f));
        UIImage *animationImage = [UIImage imageWithCGImage:imageRef];
    [animationImages addObject:animationImage];
    [animationImage release];
    }
    return animationImages;
}

另外，我还有带有 imageview 和按钮的 xib，但是当我按下 b 时，出现崩溃和控制台中的 EXC_BAD_ACCESS。在IBAction中我知道imageView没有animationImages，但为什么呢？并且有奇怪的引用计数= 3，因为在viewDidLoad中有2（为什么是2？）。我添加自我和自我-> viewDidLoad 中的前缀，但没有结果。 AnimationImages 是（复制）属性，因此在自动释放池用animationImages 耗尽后图像会保存。我对 app.10x 的这种行为感到非常惊讶！

原文

I'm neophyte in obj-c, so I cant understand some of this logic. I want to understand my code and app logic. My app is modification of easy example with animation of UIImageView: this's .h (in standart view-based template)

#import <UIKit/UIKit.h>
@interface ImageAnimatorViewController : UIViewController {
    UIImageView *animImage;
}
@property (nonatomic, retain) IBOutlet UIImageView *animImage;
- (IBAction)startAnimation;
- (NSArray*)creatAnimation:(NSString*)fileName;
@end

this's .m (without standart dealloc and viewDidUnload)

@synthesize animImage;
- (IBAction)startAnimation{
    [animImage startAnimating];
}    
- (void)viewDidLoad{
    [super viewDidLoad];

    animImage.animationImages = [self creatAnimation:@"Images.jpg"]; 
    animImage.animationDuration = 1.0f; 
    animImage.animationRepeatCount = 0; 
}    
- (NSArray*)creatAnimation:(NSString*)fileName{
    UIImage *image = [UIImage imageNamed:fileName];
    NSMutableArray *animationImages = [NSMutableArray array];
    for (int i = 0; i<8; i++) {
        CGImageRef imageRef = CGImageCreateWithImageInRect(image.CGImage, 
        CGRectMake(i*600.0f, 0.0f, 600.0f, 262.0f));
        UIImage *animationImage = [UIImage imageWithCGImage:imageRef];
    [animationImages addObject:animationImage];
    [animationImage release];
    }
    return animationImages;
}

Also i've xib with imageview and button, but when i pressed b there's crash and EXC_BAD_ACCESS in console. In IBAction I understand imageView hasn't animationImages, but why? and has strange reference count = 3,because in viewDidLoad has 2(and why 2?). I add self and self-> prefix in viewDidLoad, but it's no result. animationImages is (copy) property,so images saves after autorelease pool is drained with animationImages. I'm very surprised about this behavior of app.10x!

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