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我有一些标签的问题。我创建了一个公共方法，它从表格视图中获取信息，并在 3 个标签、一个文本视图中显示此信息，并从网络加载图片。我在表视图 didSelectRowAtIndexPath 方法中设置了所有变量，但是在显示该信息时遇到了一些问题。我这样做了：在表视图控制器中，我调用了另一种方法：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.detailCharacterViewController = [[DetailCharacterViewController alloc] init];
    [self.detailCharacterViewController setupDetailViewControllerWithName:[self.arrayCharacters[indexPath.row] objectForKey:@"name"] andSurname:[self.arrayCharacters[indexPath.row] objectForKey:@"surname"] andKind:[self.arrayCharacters[indexPath.row] objectForKey:@"kind"] andDescription:[self.arrayCharacters[indexPath.row] objectForKey:@"description"] andImage:[self.arrayCharacters[indexPath.row] objectForKey:@"URLpic"]];
}

我实现了这个方法：

    - (void)setupDetailViewControllerWithName:(NSString*)name andSurname:(NSString *)surname andKind:(NSString*) kind andDescription:(NSString*)description andImage:(NSString*)url {
    NSLog(@"name = %@", name);
    self.labelName.text = name;
    self.labelSurname.text = surname;
    self.labelKind.text = kind;
    self.textDescription.text = description;

    NSURL *urlPic = [NSURL URLWithString:url];
    NSData *dataPic = [NSData dataWithContentsOfURL:urlPic];
    [self.imagePic setImage:[UIImage imageWithData:dataPic]];
}

如果我查看日志，我会看到正确的东西，但如果我查看 iPhone 或 iPhone 模拟器上的 GUI，它将保持空白。这段代码有什么问题？感谢您的建议。

@亚历克斯布伦德尔

#import <UIKit/UIKit.h>



@interface DetailCharacterViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *labelName;
@property (weak, nonatomic) IBOutlet UILabel *labelSurname;
@property (weak, nonatomic) IBOutlet UILabel *labelKind;
@property (weak, nonatomic) IBOutlet UIImageView *imagePic;
@property (weak, nonatomic) IBOutlet UITextView *textDescription;

- (void)setupDetailViewControllerWithName:(NSString*)name andSurname:(NSString *)surname andKind:(NSString*) kind andDescription:(NSString*)description andImage:(NSString*)url;

@end
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3 回答 3

2

问题是DetailCharacterViewController当您调用时您的视图尚未加载setupDetailViewControllerWithName:...，因此没有连接任何插座（还）。通过 alloc-init 实例化视图控制器不会自动加载其视图。

[self view]您可以通过在 setup 方法的开头调用来强制加载视图。view这是有效的，因为如果之前没有加载该属性，访问该属性将自动加载视图。

或者，您可以制作视图控制器的name、surname等NSString属性，并在 中设置相应的标签viewDidLoad。

于 2013-04-13T13:08:55.690 回答
1

您是否使用 Interface Builder/Storyboards 来设计您的界面？您是否确保为每个 UITextField/View 连接 IBOutlets？

您应该在视图控制器类的头文件中识别对象，并确保它们以 IBOutlet 为前缀，以便它们出现在 Interface Builders 连接窗格中。例如

IBOutlet UITextField labelName;
[...]

然后您需要转到 IB 并转到视图控制器的连接窗格以连接每个文本字段/视图。

于 2013-04-13T12:26:31.250 回答
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This problem happened to me as well.

It has to do with the fact that iOS actually hooks up your outlets really really late.

If you put a breakpoint in your setupDetailViewControllerWithName: and check your IBOutlet variables, they will be nil. That's why you are seeing a blank view. (The good old nil erroring)

The work-around I will do is to declare properties in the DetailCharacterViewController class. (Such as @property (copy, nonatomic) NSString* name).

And in the place where you are calling setupDetailViewControllerWithName:, set those properties instead such as:

self.detailCharacterViewController.name = name;

Finally in your DetailCharacterViewController's viewDidLoad:, you set the values of the labels using the saved properties. (The outlets are for sure hooked up then).

(By the way, this problem exists for prepareForSegue: as well. The destination view controller's outlets are all still nil in prepareForSegue:. So you cannot set them directly there yet)

于 2013-04-13T17:10:59.753 回答