在多个UIViewController之间切换时如何在UIImageView中保留图像

Question

I'm trying to write an extremely basic Xcode (ver. 5) project application for the iPhone5 that loads an image from the photo library into an UIImageView in the start up UIViewController and keeps that image in the UIImageView (or returns it) when switching between other view controller panels. The problem I am having is that when I return from other UIViewController windows to the main view controller with my UIImageView , the loaded image that was previously displayed is gone and I end up having to reload it into the UIImageView . How can I make this behave where the image remains in the UIImageView after I return from other UIViewController windows?

Implementation File...

#import "ViewController.h"
@interface ViewController ()
@end

@implementation ViewController

- (IBAction)btnClick:(id)sender
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentViewController:picker animated:YES completion:NULL];
}
- (void)imagePickerController:(UIImagePickerController *)picker
    didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    modBuffer = info[UIImagePickerControllerEditedImage];
    self.imageView.image = modBuffer;

    [picker dismissViewControllerAnimated:YES completion:NULL];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:NULL];
}
- (void)viewDidLoad
{
    [super viewDidLoad];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

@end

Header file...

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
<UIImagePickerControllerDelegate, UINavigationControllerDelegate>
{
    UIImage* modBuffer;
}
@property (strong, nonatomic) IBOutlet UIImageView* imageView;
- (IBAction)btnClicked:(id)sender;

Answer 1

我认为您需要为UIImage (nonatomic,retain)属性UIImage (nonatomic,retain) ，然后您应该尝试这样做。