Question

我想在解雇模式后更新UILabel时遇到问题。基本上我有：一个带有一些UILabel和UIButtons的ViewController 当我触摸一个按钮时，它会打开一个带有文本字段的模态，我在这个文本字段中输入一些文本，然后保存到我所做的CacheHandler实例中。然后我用一个按钮解雇我的模态，我想看看我在UILabel中输入的文字。文本保存在缓存中，我已经检查过了。当我从自定义segue调用它时，我有一个更新标签的方法，标签值为null。我在哪里做错了？

自定义segue：

#import "DismissModalSegue.h"
#import "CreateSqeedViewController.h"

@implementation DismissModalSegue

- (void)perform {
    UIViewController *sourceViewController = self.sourceViewController;
    CreateSqeedViewController *destViewController = self.destinationViewController;
    [sourceViewController.presentingViewController dismissViewControllerAnimated:YES completion:^{
        [destViewController updateLabels];
    }];
}

@end

updateLabels方法：

- (void)updateLabels {
    NSLog(@"Updating labels: %@", [[[CacheHandler instance] createSqeed] place]);
/* displays what I want to display in my label */
    NSLog(@"%@", whatLabel.text);
/* displays null */
    whereLabel.text = [[[CacheHandler instance] createSqeed] place];
    whatLabel.text = [[[CacheHandler instance] createSqeed] sqeedDescription];
    NSString *peopleLabel = [NSString stringWithFormat:@"%@ / %@", [[[CacheHandler instance] createSqeed] peopleMin], [[[CacheHandler instance] createSqeed] peopleMax]];
    whoLabel.text = peopleLabel;
    whereLabel.text = [[[[CacheHandler instance] createSqeed] dateStart] description];
}

Answer 1

哪里有初始化标签？与IBOutlet有联系吗？当他们没有初始化时可能会回电话

在解除模态视图时更新UILabel

1 个答案: