ios - setImage 不工作

Question

我在设置图像时遇到问题。当从 imagePickerController 中获取图像时，我有一个代表告诉我。它将它发送到所有者 Controller ，然后我尝试在另一个 Controller 上设置图像。一切似乎都应该正常工作……但是每当我显示 View 时，图像都不存在。这是代码:

// this gets called when an image has been chosen from the library or taken from the camera
// it is in the viewController in charge of grabbing an image (.m file)
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
    if(self.delegate)
    {
        [self.delegate didAcquirePicture:image];
    }
}


//This is in the controller .m file
- (void)didAcquirePicture:(UIImage *)picture 
{
    if(picture != Nil)
    {
        self.photoEditView = [[PhotoEditViewController alloc] init];
        [self.photoPicker.imagePickerController dismissModalViewControllerAnimated:NO];
        [self.photoEditView.imageView setImage:picture];
        [self presentModalViewController: self.photoEditView animated:NO];

    }
}

//this is the photoEditViewController .h
#import <UIKit/UIKit.h>

@class PhotoEditViewController;

@protocol PhotoEditViewControllerDelegate
@end


@interface PhotoEditViewController : UIViewController {
    IBOutlet UIImageView *imageView;
}

@property (retain) UIImageView *imageView;


@end

//this is the photoEditView .m file
#import "PhotoEditViewController.h"

@implementation PhotoEditViewController

@synthesize imageView;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)dealloc {
    [super dealloc];
    [imageView dealloc];
}

@end

Answer 1

看起来有可能在您关闭 imagePickerController 时释放图像，然后再将其分配给 imageView。如果是这样，你可以修复它

[[图片保留]自动释放];

如前所述，针对 nil 而不是 Nil 进行测试。此外，最好使用 [self.delegate respondsToSelector: @selector(didAcquirePicture)]; — 请记住将消息发送到 nil 是安全的。