ios - Xcode - 如何关闭模态 UIImageView？

Question

iOS 开发的新手。我正在尝试做一个让我从照片库中选择照片并显示它的东西。我正在使用带有导航 Controller 的 Storyboard。我可以很好地选择和显示图像，但我不知道如何关闭 imageview 并返回到图像选择器。我只是得到一个全屏图像，无法点击任何地方做任何事情。代码如下所示:

snapViewController.h 

#import <UIKit/UIKit.h>

@interface snapViewController : UIViewController <UIImagePickerControllerDelegate,
UINavigationControllerDelegate> 

@property (strong, nonatomic) IBOutlet UIImageView *ImageView;

- (IBAction) done:(UIStoryboardSegue *)unwindsegue;

@end

我的.m

snapViewController.m 


#import "snapViewController.h"

@interface snapViewController ()

@end

@implementation snapViewController


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
- (BOOL)prefersStatusBarHidden {
    return YES;
    [self setNeedsStatusBarAppearanceUpdate];
}


- (void) viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    if (self.ImageView.image == nil){
        UIImagePickerController * imagePickerController = [UIImagePickerController new];
        imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
        imagePickerController.delegate = self;
        [self presentViewController:imagePickerController animated:NO completion:nil];
    }
    else {

    }



}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [self dismissViewControllerAnimated:YES completion:nil];

}

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
    self.ImageView.image = image;
    [self.ImageView setUserInteractionEnabled:YES];
    [self dismissViewControllerAnimated:YES completion:nil];


}

- (IBAction) done:(UIStoryboardSegue *)unwindsegue {


}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}



@end

Storyboard看起来像这样，我在 UIImageView 的底部贴了一个工具栏，上面有一个完成按钮: 我是否需要将完成按钮绑定(bind)到 [self dismissViewControllerAnimated:YES completion:nil]; 操作？我怎样才能做到这一点？我已经为此苦苦挣扎了几个小时，但无法弄清楚。谢谢。

Answer 1

阅读了一些关于 View 和窗口以及 View Controller 和其他东西的内容，得出了这个:

- (IBAction)kill:(id)sender {
    self.ImageView.image = nil;
    [self viewDidAppear:TRUE];
    [self dismissViewControllerAnimated:NO completion:nil];

}

我将我的完成按钮绑定(bind)到它，看起来它可以工作。这似乎是可以接受的内存明智的(多次打开和关闭图像不会使内存增加到原来的数量)。如果这不是正确的方法，请告诉我。谢谢。