使用Objective-C在Xcode 6上未显示图像

Question

当我尝试运行该程序时，会编译并且没有收到任何错误。 一切正常，除了图像未显示在View Controller上之外。 无法弄清楚图像为什么不显示在哪里。 我感谢任何投入。 这是我的代码：

ViewController.m

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"ShowItemDetail"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        ItemDetailViewController *destViewController = segue.destinationViewController;
        destViewController.itemDesc = [listItems objectAtIndex:indexPath.row];
        destViewController.itemName = [listTimes objectAtIndex:indexPath.row];
        destViewController.pictureImageView = [listImages objectAtIndex:indexPath.row];
    }

ItemDetailViewController.h

#import <UIKit/UIKit.h>

@interface ItemDetailViewController : UIViewController

@property (nonatomic, strong) IBOutlet UILabel *itemLabel;
@property (nonatomic, strong) IBOutlet UILabel *itemTitle;
@property (nonatomic, strong) NSString *itemName;
@property (nonatomic, strong) NSString *itemDesc;
@property (nonatomic, strong) IBOutlet UIImageView* pictureImageView;
@property (nonatomic, strong) UIImage *picImageView;


@end

ItemViewController.m

#import "ItemDetailViewController.h"

@interface ItemDetailViewController ()

@end

@implementation ItemDetailViewController

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

    self.itemLabel.text = self.itemName;
    self.itemTitle.text = self.itemDesc;
    self.pictureImageView.image = self.picImageView;
}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

Answer 1

在viewDidLoad ， self.picImageView为空。 请检查一下。

然后，为了设置图片，编写如下函数：

-(void) setPicImageView: (UIImage*) picImage{
    self.picImageView = picImage;
    self.pictureImageView.image = picImage;
}

这应该可以解决您的问题。

希望这可以帮助。

Answer 2

尝试此操作以准备进行测试：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
   if ([segue.identifier isEqualToString:@"ShowItemDetail"]) {
       NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
       ItemDetailViewController *destViewController = segue.destinationViewController;
       destViewController.itemDesc = [listItems objectAtIndex:indexPath.row];
       destViewController.itemName = [listTimes objectAtIndex:indexPath.row];
       destViewController.picImageView = [listImages objectAtIndex:indexPath.row];
}

并在您的viewDidLoad中尝试以下操作：

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

   self.itemLabel.text = self.itemName;
   self.itemTitle.text = self.itemDesc;
   self.pictureImageView.image = self.picImageView;
}