如何在Objective-C中创建实例变量

要使其成为实例变量,您可以将值存储在类中而不是临时变量中.当您的类被销毁而不是将其添加为子视图后,您也将释放它.

例如

// header file (.h)
@interface MyController : UIViewController
{
  UIImageView* myPicture;
}
@end

// source file (.m)
- (void) viewDidLoad
{
   myPicture = [[UIImageView alloc] initWithImage: myImageRef];
   [self.view addSubview:myPicture];

   [super viewDidLoad];
}

- (void) dealloc
{
   [myPicture release];
   [super dealloc];
}