iPhone UILabel 在首次加载时未更新

发布于 2024-10-25 01:45:05 字数 984 浏览 4 评论 0原文

我有一个 UILabel ，它不会在第一次加载时更新，但会在每次其他后续加载时正确加载。

这是代码片段。再次，正如我所说，只有第一次加载时，它才会显示 xib 中标签中指定的内容，即 label，第二次加载时，它将加载字符串 label.text= @ “玻璃、纸张、罐头、纺织品、卡片、鞋子和书籍”；。

-(IBAction)showDetails:(id)sender{
    NSLog(@"Annotation Click");
    self.userProfileVC.title=((UIButton*)sender).currentTitle;
    if([((UIButton*)sender).currentTitle isEqualToString:@"Asda"])
        self.userProfileVC.label.text= @"Glass, Paper, Cans, Textiles, Card, Shoes and Books";

    [UIView beginAnimations:@"Curl Page Down" context:nil];
    [UIView setAnimationDuration:1];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown 
                       forView:self.view cache:YES];    

    //Adjust the Subview by butting up to status bar
    self.userProfileVC.view.frame = CGRectMake(0, 0, 320, 480);
    //Add userProfileVC as a subview
    [self.view addSubview:userProfileVC.view];
    [UIView commitAnimations];
}

原文

I have a UILabel that does not update on first load but does load correctly on every other subsequent load.

Here is the snippet of code. Again, as I said, on the first load only it will display what's specified in the label in the xib, i.e label, and the second time it will load the string label.text= @"Glass, Paper, Cans, Textiles, Card, Shoes and Books";.

-(IBAction)showDetails:(id)sender{
    NSLog(@"Annotation Click");
    self.userProfileVC.title=((UIButton*)sender).currentTitle;
    if([((UIButton*)sender).currentTitle isEqualToString:@"Asda"])
        self.userProfileVC.label.text= @"Glass, Paper, Cans, Textiles, Card, Shoes and Books";

    [UIView beginAnimations:@"Curl Page Down" context:nil];
    [UIView setAnimationDuration:1];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown 
                       forView:self.view cache:YES];    

    //Adjust the Subview by butting up to status bar
    self.userProfileVC.view.frame = CGRectMake(0, 0, 320, 480);
    //Add userProfileVC as a subview
    [self.view addSubview:userProfileVC.view];
    [UIView commitAnimations];
}

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傲影 2024-11-01 01:45:05

我相信当你第一次访问 self.userProfileVC.label 时，label 仍然是 nil 因为视图本身没有尚未加载。快速解决方法是，您必须首先通过将 self.userProfileVC.view; 语句放在 showDetails 方法的开头来加载视图。

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你怎么敢 2024-11-01 01:45:05

大概当您单击 UIButton 时会调用此代码。因此，在第一次 UI 加载时，我不希望调用您的方法（因为没有按下任何按钮）。为什么不尝试在 viewDidLoad 或类似内容中设置默认文本？

例如：

- (void)viewDidLoad {
    self.userProfileVC.label.text= @"Glass, Paper, Cans, Textiles, Card, Shoes and Books";
}

Presumably this code is called when you click your UIButton. So at first UI load I wouldn't expect your method to get called (as no button was pressed). Why don't you try setting up the default text in viewDidLoad or similar?

e.g. something along the lines of:

- (void)viewDidLoad {
    self.userProfileVC.label.text= @"Glass, Paper, Cans, Textiles, Card, Shoes and Books";
}

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私藏温柔 2024-11-01 01:45:05

我真是个白痴，我改变了代码的顺序......在标签之前先加载视图。卫生部！

代码片段如下：-(

IBAction)showDetails:(id)sender{

//Must load the view before the annotations update the label with the correct label text!
[UIView beginAnimations:@"Curl Page Down" context:nil];
[UIView setAnimationDuration:1];

[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown 
                       forView:self.view cache:YES];    

//Adjust the Subview by butting up to status bar
self.userProfileVC.view.frame = CGRectMake(0, 0, 320, 480);
//Add userProfileVC as a subview
[self.view addSubview:userProfileVC.view];
[UIView commitAnimations];

NSLog(@"Annotation Click");
self.userProfileVC.title=((UIButton*)sender).currentTitle;
if([((UIButton*)sender).currentTitle isEqualToString:@"Asda"])
    self.userProfileVC.label.text= @"Glass, Paper, Cans, Textiles, Card, Shoes and Books";

I am such an idiot I have changed the order of my code....load the view first before the labels. DOH!

Heres the snippet:

-(IBAction)showDetails:(id)sender{

//Must load the view before the annotations update the label with the correct label text!
[UIView beginAnimations:@"Curl Page Down" context:nil];
[UIView setAnimationDuration:1];

[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown 
                       forView:self.view cache:YES];    

//Adjust the Subview by butting up to status bar
self.userProfileVC.view.frame = CGRectMake(0, 0, 320, 480);
//Add userProfileVC as a subview
[self.view addSubview:userProfileVC.view];
[UIView commitAnimations];

NSLog(@"Annotation Click");
self.userProfileVC.title=((UIButton*)sender).currentTitle;
if([((UIButton*)sender).currentTitle isEqualToString:@"Asda"])
    self.userProfileVC.label.text= @"Glass, Paper, Cans, Textiles, Card, Shoes and Books";

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