查看控制器未被释放

Question

我有2个控制器InitViewController和SettingsViewController.每个视图都有一个调用另一个视图的按钮:

InitViewController

@interface InitViewController : UIViewController
    - (IBAction)loadSettings:(id)sender;
@end

@implementation InitViewController
    - (IBAction)loadSettings:(id)sender {
        SettingsViewController *vc = [[SettingsViewController alloc] initWithNibName:@"SettingsViewController" bundle:nil];
        [self presentViewController:vc animated:YES completion:nil];
        vc = nil;
    }
@end

SettingsViewController

@interface SettingsViewController : UIViewController
    - (IBAction)back:(id)sender;
@end

@implementation SettingsViewController
    - (IBAction)back:(id)sender {
        InitViewController *vc = [[InitViewController alloc] initWithNibName:@"InitViewController" bundle:nil];
        [self presentViewController:vc animated:YES completion:nil];
        vc = nil;
    }
@end

虽然我通过多次点击按钮来分析应用程序并测试它,但我看到InitViewController和SettingsViewController的实例仍然存在=>

我究竟做错了什么？

Answer 1

你SettingsViewController不会回到InitViewController创造它的那个.相反,它会创建一个新实例InitViewController并呈现它.所以你最终得到一堆视图控制器,在InitViewController和的实例之间交替SettingsViewController.

因为在呈现它之后你永远不会忽略任何类型的视图控制器,所以它们都不能被释放.

你的-[SettingsViewController back:]行动应该解雇自己,而不是创造和呈现新的InitViewController.

@implementation SettingsViewController

- (IBAction)back:(id)sender {
    [self dismissViewControllerAnimated:YES completion:nil];
}