在视图控制器之间传递图像不工作呈现模式视图

我想从一个视图控制器（包含集合视图）传递图像到另一个视图控制器，但它不会发生。我是iOS新手Objective C。任何人都可以告诉我解决方案。这里是我的代码...在视图控制器之间传递图像不工作呈现模式视图

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{ 


    DetailedAlbumViewController *davc = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailedAlbumViewController"]; 

    AlbumPhotoCollectionViewCell *cell = (AlbumPhotoCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath]; 

    UIImage *image = cell.imageView.image; 

    [davc setImage:image]; 

    //davc.imageView.image = image; 


    [self presentModalViewController:davc animated:YES]; 
}

在我的第二个视图控制器

...

- (void) setImage:(UIImage *) image{ 

    UIImage *someImage = [[UIImage alloc]init]; 
    someImage = image;  // image is passing upto here.. i.e. someImage is being allocated with the image passed from first view controller.. 

    self.imageView.image = someImage;  // here it is showing nil 

}

我使用调试控制台..输出..

(lldb) po someImage 
<UIImage: 0x79eb8590>, {500, 347} 

(lldb) po self.imageView.image 
nil

来源

2017-07-03 Venu Pendota

为什么不' - （void）setImage：（UIImage *）image self.imageView.image = image; //这里显示为nil }'并尝试在您的viewController中声明'DetailedAlbumViewController * davc'，在那里您正在展示 –

因为同样的事情正在发生..然后我想我可以为它分配一些内存。所以我确实喜欢这样.. –

对不起，再次询问...我初始化davc作为属性..它不工作.. –

你只能通过图像未设置图像到目的地控制呃。所以你需要编码如下。

在DetailedAlbumViewController

@property (nonatomic, strong) UIImage *yourImage ;

在viewDidLoad中DetailedAlbumViewControllerv

[self setImage:self.yourImage];

的虽然细胞点击

建议 - 您需要使用didselectItemAtIndexpath而不是didDeselectItemAtIndexPath。

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{ 


    DetailedAlbumViewController *davc = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailedAlbumViewController"]; 

    AlbumPhotoCollectionViewCell *cell = (AlbumPhotoCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath]; 

    UIImage *image = cell.imageView.image; 
    davc.yourImage = image 

    [self presentModalViewController:davc animated:YES]; 
}

来源

2017-07-03 05:43:36 KKRocks

谢谢..其工作.... –

欢迎.... @ VenuPendota – KKRocks

然后标记为接受 – KKRocks

请检查你可能有self.imageView无

来源

2017-07-03 05:29:25 vivek

只需在DetailedAlbumViewController中创建一个UIImage属性即可。

@property (nonatomic, strong) UIImage *someImage ;

接下来将当前图像分配给它，如下面的代码片段所示。

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{ 


DetailedAlbumViewController *davc = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailedAlbumViewController"]; 

AlbumPhotoCollectionViewCell *cell = (AlbumPhotoCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath]; 

UIImage *image = cell.imageView.image; 

davc.someImage = image; 

[self presentModalViewController:davc animated:YES]; 
}

来源

2017-07-03 05:45:10

谢谢..其工作.... –

创建于DetailedAlbumViewController头文件属性，把它作为selectedImage

@property(nonatomic, strong) UIImage *selectedImage;

更改您的实现像下面

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{ 


    DetailedAlbumViewController *davc = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailedAlbumViewController"]; 

    AlbumPhotoCollectionViewCell *cell = (AlbumPhotoCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath]; 

    UIImage *image = cell.imageView.image; 

    davc.selectedImage = image; 


    [self presentModalViewController:davc animated:YES]; 
}

在DetailedAlbumViewController实现文件viewWillAppear更新您的ImageView的图像。

并确保您的imageView不是nil。从Storyboard/xib否则连接UIImageView分配和它在viewWillAppear

- (void)viewWillAppear:(BOOL)animated { 
    [super viewWillAppear:animated]; 

    if (self.imagView == nil) { 
     //allocate and position the imageView 
     self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)]; 
    } 
    self.imageView.image = self.selectedImage; 
}

来源

2017-07-03 05:45:18 Subramanian

谢谢..其工作.... –

的UIImage *图像= cell.imageView的时间位置。图片;

图像可以是零，你需要确认一次，如果图片即将那么你可以把

if (self.imagView == nil) { 
      //allocate and position the imageView 
      self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)]; 
     } 
self.imageView.image = self.selectedImage;

内 viewDidAppear而不是viewWillAppear中的方法。

来源

2017-07-03 09:33:25

在视图控制器之间传递图像不工作呈现模式视图

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