我无法从保存的数据加载符合NSCoding协议的自定义类的实例。我的类有一个UIImage属性,当我为它分配一个新的UIImage时,程序崩溃了一个exc_bad_access。
在视图控制器中,我声明我的对象如下:
@interface SomeViewController : UIViewController {
IBOutlet UIImageView *imageView;
SomeClass *myObject;
}
@property (nonatomic, retain) SomeClass *myObject;
@property (nonatomic, retain) IBOutlet UIImageView *imageView;
然后在.m文件中使用如下:
@synthesize myObject;
@synthesize imageView;
-(void)viewDidLoad{
myObject = [NSKeyedUnarchiver unarchiveObjectWithFile:someDataPath];
imageView.image = myObject.image;
}
到目前为止一切顺利。但后来我选择了一个新图像,并尝试将其设置为myObject的“image”属性,这会抛出一个exc_bad_access
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissModalViewControllerAnimated:YES];
UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
[imageView setImage:image];
myObject.image = image;
}
就我单步执行代码而言,它是导致exc_bad_access的最后一行。我究竟做错了什么?
答案 0 :(得分:2)
你必须保留myObject:
self.myObject = [NSKeyedUnarchiver unarchiveObjectWithFile:someDataPath];