如何将图像从uiimagepickercontroller传递到另一个场景的uiimageview中

Question

如何保存UIImagePickerController相机图像以便我可以发送到CreateViewController场景UIImageView？

HomeViewController(场景1)有一个按钮,可以加载UIImagePickerController并返回来自摄像机的图像.CreateViewController(场景2)空了UIImageView.

HomeViewController.h

#import "CreateViewController.h"

@interface HomeViewController : UIViewController
<UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (strong, nonatomic) UIImagePickerController *imagePicker;
@property(nonatomic, retain) UIImage *myImage;

- (IBAction)cameraImage:(id)sender;

HomeViewController.m

@implementation HomeViewController
@synthesize imagePicker, myImage;

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

if ( [segue.identifier isEqualToString:@"create"]) {
    CreateViewController *cvc = [segue destinationViewController];
    UIImage *image = myImage;
    cvc.myImage = image;

}
}

//Camera button action
- (IBAction)cameraImage:(id)sender{
//UIImagePickerController space in memory
imagePicker = [[UIImagePickerController alloc]init];
//Set the delegate
imagePicker.delegate = self;
//Set the sourceType
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
//Show Image Picker UI
[self presentViewController:imagePicker animated:YES completion:^{}];
}

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:    (NSDictionary *)info {

self.myImage = [info objectForKey:UIImagePickerControllerOriginalImage];

[self dismissViewControllerAnimated:YES completion:^{}];

[self performSegueWithIdentifier:@"create" sender:self];
}

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

CreateViewController.h

@property (strong, nonatomic) IBOutlet UIImageView *bgImage;
@property(nonatomic, retain) UIImage *myImage;

CreateViewController.m

@implementation CreateViewController
@synthesize bgImage, myImage;

- (void)viewDidLoad
{
[super viewDidLoad];
UIImage *image = myImage;
[bgImage setImage:image];
}

在此下载示例代码; http://code-blind.com/ios6-camera-picture-to-another-scenes-uiimageview/

Answer 1

如果以编程方式实例化控制器,则不必使用segue.

实现这一目标的最简单方法就是这样

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    [picker dismissViewControllerAnimated:YES completion:nil];
    UIImage * pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    DisplayViewController * controller = [DisplayViewController new];
    controller.imageView.image = pickedImage;
    [self.navigationController pushViewController:controller animated:YES];
}

如果你想使用segue,你需要手动调用它

[self performSegueWithIdentifier:@"your-segue-name" sender:self];

然后你可以在你的HomeViewController中使用一个ivar存储pickedImage并传递给你destinationViewController.

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {    
    DisplayViewController * controller = (DisplayViewController *)segue.destinationViewController;
    controller.imageView.image = _pickedImage;
}

这里_pickedImage是您存储的图像已经经过挑选的伊娃.