ios - 将图像从一个 View 传递到另一个 View

Question

我从照片库中获取用户的图像，我想将它传递给另一个 View ...

我读过我应该能够简单地做这样的事情:

secView.imgView.image = selectedImage.image;

在第二个 View 上将我的 UIImageView 设置为来 self 的 UIImageView 的图像...但是第二个 View 中的 UIImageView 只是空的...

我的代码是这样的...

ViewController.h:

@interface ViewController : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate>
{
    UIImagePickerController *picker;
    IBOutlet UIImageView *selectedImage;

    SecondView *secondView;
}

@property (nonatomic, retain) UIImageView *selectedImage;
@property (nonatomic, retain) SecondView *secondView;

-(IBAction)sendImage:(id)sender;
-(IBAction)openGallery:(id)sender;

@end

ViewController.m(仅相关部分)

-(IBAction)sendImage:(id)sender
{
    if(self.secondView == nil)
    {
        SecondView *secView = [[SecondView alloc] initWithNibName:@"SecondView" bundle:[NSBundle mainBundle]];

        self.secondView = secView;

        secView.imgView.image = selectedImage.image;
    }

    [self.navigationController pushViewController:secondView animated:YES];
}

-(IBAction)openGallery:(id)sender
{
    picker = [[UIImagePickerController alloc] init];

    picker.delegate = self;

    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentModalViewController:picker animated:YES];
}

-(void)imagePickerControllerDidCancel:(UIImagePickerController *) Picker 
{    
    [Picker dismissModalViewControllerAnimated:YES];    
}

- (void)imagePickerController:(UIImagePickerController *) Picker

didFinishPickingMediaWithInfo:(NSDictionary *)info 
{    
    // Save the image
    selectedImage.image = [info objectForKey:UIImagePickerControllerOriginalImage];

    [Picker dismissModalViewControllerAnimated:YES];
}

在另一篇文章中，我读到另一种方法是这样做:

-(IBAction)sendImage:(id)sender
{
    if(self.secondView == nil)
    {
        SecondView *secView = [[SecondView alloc] initWithNibName:@"SecondView" bundle:[NSBundle mainBundle]];

        self.secondView = secView;

        [secView setImage:selectedImage.image];
    }

    [self.navigationController pushViewController:secondView animated:YES];
}

然后在secondview.h中

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

和.m

-(void)setImage:(UIImage *)image
{
    [imgView setImage:image];
}

但这两种方法都会导致一个空的 UIImageView...那么这样做的正确方法是什么？

提前致谢!

编辑

SecondView 目前相当简单......(在发布的代码中我尝试并遵循方法二)

@interface SecondView : UIViewController
{
    UIImageView *imgView;
}

@property (nonatomic, retain) IBOutlet UIImageView *imgView;

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

@end

@implementation SecondView

@synthesize imgView;

-(void)setImage:(UIImage *)image
{
    [imgView setImage:image];
}

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

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

解决方案好的...回到第一种方法并进行了一些最终有效的更改...

-(IBAction)sendImage:(id)sender
{
    if(self.secondView == nil)
    {
        SecondView *secView = [[SecondView alloc] initWithNibName:@"SecondView" bundle:[NSBundle mainBundle]];

        self.secondView = secView;

        secView.theImage = selectedImage.image;
    }

    [self.navigationController pushViewController:secondView animated:YES];
}

在第二个 View 中，我创建了 UIImage *theImage - 然后我设置了 [imgView setImage:theImage];在 viewDidLoad 中，它起作用了......

Answer 1

这解决了问题:

-(IBAction)sendImage:(id)sender
{
    if(self.secondView == nil)
    {
        SecondView *secView = [[SecondView alloc] initWithNibName:@"SecondView" bundle:[NSBundle mainBundle]];

        self.secondView = secView;

        secView.theImage = selectedImage.image;
    }

    [self.navigationController pushViewController:secondView animated:YES];
}

第二 View :

@interface SecondView : UIViewController
{
    UIImageView *imgView;
    UIImage *theImage;
}

@property (nonatomic, retain) IBOutlet UIImageView *imgView;
@property (nonatomic, retain) UIImage *theImage;

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

@end

在 secondView 的 .m 中:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    [imgView setImage:theImage];
}