iOS UIImageView不显示图像

我的应用程序中有两个视图控制器，一个控制器使用AVCaptureSession捕捉照片

我在写这个,

[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
 {
     CFDictionaryRef exifAttachments = CMGetAttachment( imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
     if (exifAttachments)
     {
         // Do something with the attachments.
         NSLog(@"attachements: %@", exifAttachments);
     }
     else
         NSLog(@"no attachments");

     NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
     UIImage *displayimage = [[UIImage alloc] initWithData:imageData];

     SecondViewController *sec = [[SecondViewController alloc]init];
     sec.showTakenPic.image = displayimage;
     [self.navigationController pushViewController:sec animated:YES];
 }];

SecondViewController包含UIImageView，我正在将其图像设置为显示图像，但未设置图像

我的第二个ViewController是由故事板制成的

第二个ViewController.h看起来像这样

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@property(atomic,retain) IBOutlet UIImageView *showTakenPic;

@end

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

-(void)viewDidLoad {
 [super viewDidLoad];
 [self.navigationController setNavigationBarHidden:YES animated:YES];
}

-(void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

图像在UIImageView中不可见为什么？

试试这个

您必须首先从情节提要加载控制器

根据此图像设置标识符

然后

这是主线问题

Choice-2

if (imageData)
{
 UIImage *displayimage = [[UIImage alloc] initWithData:imageData];

 SecondViewController *sec = [[SecondViewController alloc]init];
 sec.showTakenPic.image = displayimage;
 [self.navigationController pushViewController:sec animated:YES];
}

试试这个

您必须首先从情节提要加载控制器

根据此图像设置标识符

然后

这是主线问题

Choice-2

if (imageData)
{
 UIImage *displayimage = [[UIImage alloc] initWithData:imageData];

 SecondViewController *sec = [[SecondViewController alloc]init];
 sec.showTakenPic.image = displayimage;
 [self.navigationController pushViewController:sec animated:YES];
}

---

首先，检查图像是否为非零。 第二，在按下视图控制器后尝试设置图像

if (displayimage)
{
     SecondViewController *sec = [[SecondViewController alloc]init];
     [self.navigationController pushViewController:sec animated:YES];
     sec.showTakenPic.image = displayimage;
     sec.showTakenPic.backgroundColor = [UIColor redColor];
}
else
{
    NSLog(@"displayimage is nill");
}

FirstViewController.m

SecondViewController *postImageViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

[postImageViewController setImage:image];

SecondViewController.h

@interface SecondViewController : UIViewController {

    UIImage * postImage;
}

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

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

@end

SecondViewController.m

- (void)viewWillAppear:(BOOL)animated {

    if(postImage) {

        _imageView.image = postImage;

    }

}

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

    postImage = image;

}

---

首先，检查图像是否为非零。 第二，在按下视图控制器后尝试设置图像

if (displayimage)
{
     SecondViewController *sec = [[SecondViewController alloc]init];
     [self.navigationController pushViewController:sec animated:YES];
     sec.showTakenPic.image = displayimage;
     sec.showTakenPic.backgroundColor = [UIColor redColor];
}
else
{
    NSLog(@"displayimage is nill");
}

FirstViewController.m

SecondViewController *postImageViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

[postImageViewController setImage:image];

SecondViewController.h

@interface SecondViewController : UIViewController {

    UIImage * postImage;
}

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

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

@end

SecondViewController.m

- (void)viewWillAppear:(BOOL)animated {

    if(postImage) {

        _imageView.image = postImage;

    }

}

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

    postImage = image;

}

---

图像有多大？它是什么颜色？如果图像比UIImageView大得多，并且ContentMode属性设置不正确，则您可能只能看到图像的一小部分黑色。

图像有多大，颜色是什么？如果图像比UIImageView大得多，并且ContentMode属性设置不正确，则您可能只看到图像的一小部分黑色。

在内存中加载SecondViewController时尝试设置图像。。获取UIImage类型的ivar，当控制器推入堆栈时，使用ivar在showTakenPic imageView上设置图像

UIStoryboard mainStoryboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle: nil];
 SecondViewController *controller = (SecondViewController *)  
[mainStoryboard instantiateViewControllerWithIdentifier:@"SecondViewController"];
controller.imageToSet = imagePickedFromFirstController
[self.navigationController pushViewController:controller];

您可以将此代码添加到SecondViewController的viewDidLoad或ViewWillDisplay中

self.showTakenPic.image = self.imageToSet

---

或者你用的任何东西

在内存中加载SecondViewController时尝试设置图像。。获取UIImage类型的ivar，当控制器推入堆栈时，使用ivar在showTakenPic imageView上设置图像

UIStoryboard mainStoryboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle: nil];
 SecondViewController *controller = (SecondViewController *)  
[mainStoryboard instantiateViewControllerWithIdentifier:@"SecondViewController"];
controller.imageToSet = imagePickedFromFirstController
[self.navigationController pushViewController:controller];

您可以将此代码添加到SecondViewController的viewDidLoad或ViewWillDisplay中

self.showTakenPic.image = self.imageToSet

---

或者你用的任何东西

您应该将图像间接设置到第二个视图控制器中

if (displayimage)
{
     SecondViewController *sec = [[SecondViewController alloc]init];
     [self.navigationController pushViewController:sec animated:YES];
     sec.showTakenPic.image = displayimage;
     sec.showTakenPic.backgroundColor = [UIColor redColor];
}
else
{
    NSLog(@"displayimage is nill");
}

FirstViewController.m

SecondViewController *postImageViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

[postImageViewController setImage:image];

SecondViewController.h

@interface SecondViewController : UIViewController {

    UIImage * postImage;
}

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

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

@end

SecondViewController.m

- (void)viewWillAppear:(BOOL)animated {

    if(postImage) {

        _imageView.image = postImage;

    }

}

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

    postImage = image;

}

---

您应该将图像间接设置到第二个视图控制器中

if (displayimage)
{
     SecondViewController *sec = [[SecondViewController alloc]init];
     [self.navigationController pushViewController:sec animated:YES];
     sec.showTakenPic.image = displayimage;
     sec.showTakenPic.backgroundColor = [UIColor redColor];
}
else
{
    NSLog(@"displayimage is nill");
}

FirstViewController.m

SecondViewController *postImageViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

[postImageViewController setImage:image];

SecondViewController.h

@interface SecondViewController : UIViewController {

    UIImage * postImage;
}

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

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

@end

SecondViewController.m

- (void)viewWillAppear:(BOOL)animated {

    if(postImage) {

        _imageView.image = postImage;

    }

}

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

    postImage = image;

}

---

@Anbu Karthik先生showTakenPic是IBOutlet他必须从情节提要加载我同意你的观点，也考虑一下这个场景，在

imageData

转换之前，页面也将导航图像不显示。第二视图控制器不是导航控制器，所以我可以像这样推它吗？@avinashharma您可以推它，但脚本中的实例化是compulsary@Anbu.Karthik同意，长官，但如果没有图像，仍在从nib加载compulsary@Anbu.Karthik先生，showTakenPic是IBOutlet，他必须从情节提要加载我同意你的观点，也考虑一下这个场景，在

imageData

转换之前，页面也将导航图像不显示。第二视图控制器不是导航控制器，所以我可以像这样推它吗？@avinashharma您可以推它，但脚本中的实例化是compulsary@Anbu.Karthik同意，长官，但如果没有图像，仍然从nib加载是强制的显示图像不是nil但即使在设置图像UIImageView显示nilYes仍然给我一个黑屏显示图像不是nil但即使在设置图像UIImageView显示nilYes仍然给我一个黑屏