objective-c - XCode 自定义事件指示器 - 在 UIWebView 加载后隐藏 (webViewDidFinishLoad)

Question

我正在使用此处找到的代码 http://blog.blackwhale.at/?p=336创建自定义 activityIndicator在当前版本的 xCode 中。此代码使用一系列 .png数组中的图像，然后以设置的间隔显示它们以创建动画加载图像，然后您可以随时将其放置在屏幕上(假设您可以以某种方式删除它)。

在我的主 ViewController.m 文件中，我的 viewDidLoad 中有以下代码部分:

/* --- START CUSTOM ACTIVITY INDICATOR */
    //Create the first status image and the indicator view
    UIImage *statusImage = [UIImage imageNamed:@"activity1.png"];
    UIImageView *activityImageView = [[UIImageView alloc] 
                                      initWithImage:statusImage];
    
    
    //Add more images which will be used for the animation
    activityImageView.animationImages = [NSArray arrayWithObjects:
                                         [UIImage imageNamed:@"activity1.png"],
                                         [UIImage imageNamed:@"activity2.png"],
                                         [UIImage imageNamed:@"activity3.png"],
                                         [UIImage imageNamed:@"activity4.png"],
                                         [UIImage imageNamed:@"activity5.png"],
                                         [UIImage imageNamed:@"activity6.png"],
                                         [UIImage imageNamed:@"activity7.png"],
                                         [UIImage imageNamed:@"activity8.png"],
                                         [UIImage imageNamed:@"activity9.png"],
                                         [UIImage imageNamed:@"activity10.png"],
                                         [UIImage imageNamed:@"activity11.png"],
                                         [UIImage imageNamed:@"activity12.png"],
                                         nil];
    
    
    //Set the duration of the animation (play with it
    //until it looks nice for you)
    activityImageView.animationDuration = 0.6;
    
    
    //Position the activity image view somewhere in 
    //the middle of your current view
    activityImageView.frame = CGRectMake(
                                         self.view.frame.size.width/2
                                         -statusImage.size.width/2, 
                                         self.view.frame.size.height/1.2
                                         -statusImage.size.height/1.2, 
                                         statusImage.size.width, 
                                         statusImage.size.height);
    
    //Start the animation
    [activityImageView startAnimating];
    
    
    //Add your custom activity indicator to your current view
    [self.view addSubview:activityImageView];

    
   /*  --- END CUSTOM ACTIVITY INDICATOR */

我想清除/删除/隐藏 activityImageView元素，因为我只希望它在应用程序首次启动时显示，直到 UIWebView完成加载。

我想调用它并在 webViewDidStartLoad 时显示 gif然后在 webViewDidFinishLoad 时清除.有人帮忙吗？？

Answer 1

你应该这样走:

- (void)viewDidLoad {
    [super viewDidLoad];

    //Create the first status image and the indicator view
    UIImage *statusImage = [UIImage imageNamed:@"activity1.png"];
    UIImageView *activityImageView = [[UIImageView alloc] 
                                  initWithImage:statusImage];


    //Add more images which will be used for the animation
    activityImageView.animationImages = [NSArray arrayWithObjects:
                                     [UIImage imageNamed:@"activity1.png"],
                                     [UIImage imageNamed:@"activity2.png"],
                                     [UIImage imageNamed:@"activity3.png"],
                                     [UIImage imageNamed:@"activity4.png"],
                                     [UIImage imageNamed:@"activity5.png"],
                                     [UIImage imageNamed:@"activity6.png"],
                                     [UIImage imageNamed:@"activity7.png"],
                                     [UIImage imageNamed:@"activity8.png"],
                                     [UIImage imageNamed:@"activity9.png"],
                                     [UIImage imageNamed:@"activity10.png"],
                                     [UIImage imageNamed:@"activity11.png"],
                                     [UIImage imageNamed:@"activity12.png"],
                                     nil];


    //Set the duration of the animation (play with it
    //until it looks nice for you)
    activityImageView.animationDuration = 0.6;


    //Position the activity image view somewhere in 
    //the middle of your current view
    activityImageView.frame = CGRectMake(
                                     self.view.frame.size.width/2
                                     -statusImage.size.width/2, 
                                     self.view.frame.size.height/1.2
                                     -statusImage.size.height/1.2, 
                                     statusImage.size.width, 
                                     statusImage.size.height);

    //Start the animation
    [activityImageView startAnimating];


    //Add your custom activity indicator to your current view
    [self.view addSubview:activityImageView];

    self.timer = [NSTimer scheduledTimerWithTimeInterval:(1.0/2.0)
                                                  target:self
                                                selector:@selector(loading)
                                                userInfo:nil
                                                 repeats:YES];

}

- (void)loading {

    if (!self.webView.loading) {
        [activityImageView stopAnimating];
        activityImageView.hidden = 1;
    } else {
        [activityImageView startAnimating];
    }

}