Question

我有一个MainViewController，它将CustomModalViewController添加为子视图。

当调用委托函数customModalClickedButtonAtIndex时，MainViewController导航应该推送NextView。

CustomModal正确removeFromSuperview，但是因为NextView没有被推送而出现问题。

MainViewController.m

...
@implementation MainViewController

- (IBAction)btnShowCustomModal:(id)sender
{
    // Add the CustomModal as a SubView
    CustomModalViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"CustomModal"];
        viewController.delegate = self;
        [self.navigationController addChildViewController:viewController];
        [viewController didMoveToParentViewController:self];
        [self.navigationController.view addSubview:viewController.view];
}

#pragma mark - CustomModalViewControllerDelegate
- (void)customModalClickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 0) {
        // Left Button
    }
    else if (buttonIndex == 1) {
        // Right Button
    }

    // Try to push the NextView. It's not working properly.
    UIViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"NextView"];
    [self.navigationController pushViewController:viewController animated:YES];
}
...
@end

CustomModalViewController.h

#import <UIKit/UIKit.h>

@protocol CustomModalViewControllerDelegate <NSObject>

- (void)customModalClickedButtonAtIndex:(NSInteger)buttonIndex;

@end


@interface CustomModalViewController : UIViewController

@property (weak, nonatomic) id <CustomModalViewControllerDelegate> delegate;

@end

CustomModalViewController.m

#import "CustomModalViewController.h"

@interface CustomModalViewController ()

@end

@implementation CustomModalViewController

- (IBAction)btnLeft:(id)sender
{
    // Close the Modal and return the delegate method.
    [self.view removeFromSuperview];

    [self.delegate customModalClickedButtonAtIndex:0];
}

- (IBAction)btnRight:(id)sender
{
    // Close the Modal and return the delegate method.
    [self.view removeFromSuperview];

    [self.delegate customModalClickedButtonAtIndex:1];
}

@end

Answer 1

RemoveFromSuperview将清理视图，之后无法保证执行。所以代码永远不会被调用。

你会想要做两件事之一。 1.让调用视图句柄关闭它，因为它是添加它的那个，所以这样做也不错。 2.首先调用您的代码，然后调整顺序以确保它仍然有效。

自定义子视图（如AlertView）导航流程（代理）

1 个答案: