Objective c XCode自定义活动指示器-加载UIWebView后隐藏（webViewDidFinishLoad）

我正在使用这里找到的代码在当前版本的xCode中创建一个自定义的

activityIndicator

。此代码使用数组中的一系列

.png

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）

在我的主ViewController.m文件中，我的

viewDidLoad

部分中有以下代码：

/* --- 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

---

我想调用此函数，并在

webViewDidStartLoad

时显示gif，然后在

webViewDidFinishLoad

时清除gif。有人帮助吗？

在头文件中将activityImageView声明为属性，并在

viewDidLoad:

方法中配置它

您应该在UIWebViewDelegate方法中添加activityImageView

- (void)webViewDidStartLoad:(UIWebView *)webView

然后在UIWebViewDelegate方法中

停止设置动画

和

从SuperView移除

- (void)webViewDidFinishLoad:(UIWebView *)webView
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

你应该阅读和阅读

更新

在标题中：

@property(nonatomic, retain) UIImageView *activityImageView;

在您的实现中

@synthesize activityImageView;

-(void)viewDidLoad{
  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);
}

- (void)webViewDidStartLoad:(UIWebView *)webView{
[self.activityImageView startAnimating];
[self.view addSubview:activityImageView];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView{
[activityImageView stopAnimating];
[activityImageView removeFromSuperview];
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
[activityImageView stopAnimating];
[activityImageView removeFromSuperview];
}

---

在头文件中将activityImageView声明为属性，并在

viewDidLoad:

方法中配置它

您应该在UIWebViewDelegate方法中添加activityImageView

- (void)webViewDidStartLoad:(UIWebView *)webView

然后在UIWebViewDelegate方法中

停止设置动画

和

从SuperView移除

- (void)webViewDidFinishLoad:(UIWebView *)webView
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

你应该阅读和阅读

更新

在标题中：

@property(nonatomic, retain) UIImageView *activityImageView;

在您的实现中

@synthesize activityImageView;

-(void)viewDidLoad{
  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);
}

- (void)webViewDidStartLoad:(UIWebView *)webView{
[self.activityImageView startAnimating];
[self.view addSubview:activityImageView];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView{
[activityImageView stopAnimating];
[activityImageView removeFromSuperview];
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
[activityImageView stopAnimating];
[activityImageView removeFromSuperview];
}

---

好的，您无法访问activityImageView的原因是因为它在viewDidLoad函数中声明。将其作为属性添加到ViewController类中，您应该能够执行所需的操作。确保从viewDidLoad中删除activityImageView的声明，并在那里初始化它

另外，要显示活动指示器的Web视图在哪里？它是否有单独的视图控制器，还是包含在主视图控制器中？听起来您的activityImageView的范围不正确，但在不知道如何设置所有内容的情况下，我很难告诉您将其放置在何处

在这两个位置使用活动指示器后，您是否计划在应用程序运行时再次使用它，还是仅在重新加载应用程序时才会看到它？根据答案的不同，您可能只想将其隐藏，或者将其从主视图中删除

UIImageView.hidden控制可见性

编辑，按要求编码：

ViewController.h

@interface ViewController : UIViewController
{
    UIWebView *_webView;
}

@property(nonatomic, strong) UIWebView *webView;
@property(nonatomic, strong) UIImageView *activityImageView;

ViewController.m

@implementation ViewController
@synthesize activityImageView;
@synthesize webView = _webView;

-(void)viewDidLoad {

    //all your previous stuff with the change that you just alloc activityImageView instead of declare it
    activityImageView = [[UIImageView alloc] initWithImage:statusImage];
    //The above is the initialization, below is where your old code should go
}

---

好的，您无法访问activityImageView的原因是因为它在viewDidLoad函数中声明。将其作为属性添加到ViewController类中，您应该能够执行所需的操作。确保从viewDidLoad中删除activityImageView的声明，并在那里初始化它

另外，要显示活动指示器的Web视图在哪里？它是否有单独的视图控制器，还是包含在主视图控制器中？听起来您的activityImageView的范围不正确，但在不知道如何设置所有内容的情况下，我很难告诉您将其放置在何处

在这两个位置使用活动指示器后，您是否计划在应用程序运行时再次使用它，还是仅在重新加载应用程序时才会看到它？根据答案的不同，您可能只想将其隐藏，或者将其从主视图中删除

UIImageView.hidden控制可见性

编辑，按要求编码：

ViewController.h

@interface ViewController : UIViewController
{
    UIWebView *_webView;
}

@property(nonatomic, strong) UIWebView *webView;
@property(nonatomic, strong) UIImageView *activityImageView;

ViewController.m

@implementation ViewController
@synthesize activityImageView;
@synthesize webView = _webView;

-(void)viewDidLoad {

    //all your previous stuff with the change that you just alloc activityImageView instead of declare it
    activityImageView = [[UIImageView alloc] initWithImage:statusImage];
    //The above is the initialization, below is where your old code should go
}

---

你应该这样做：

- (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];
    }

}

---

你应该这样做：

- (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];
    }

}

---

动画完成后，您是否尝试从当前视图中删除activityImageView？或者更好，改变可见性？或者我不明白是什么阻止你在你提到的两个函数中调用它，也许你可以澄清你遇到的问题？你能告诉我怎么做吗？：）比如什么代码，放在哪里？我很快就明白了。问题（我想我有，但老实说我真的不知道）是

activityImageView

无法在

viewDidLoad

部分之外访问…？啊，好吧，我知道你需要做什么，我将在回答部分发布。动画完成后，您是否尝试从当前视图中删除activityImageView？或者更好，改变可见性？或者我不明白是什么阻止你在你提到的两个函数中调用它，也许你可以澄清你遇到的问题？你能告诉我怎么做吗？：）比如什么代码，放在哪里？我很快就明白了。问题（我想我有，但老实说我不知道）是

activityImageView

在

viewDidLoad

部分之外是无法访问的…？啊，好吧，我知道你需要做什么，我会在答案部分发布。你能给我一些示例代码吗？：）比如我如何初始化它（在你的第一段）你的应用程序的结构是什么？你的网络视图在哪里？您的主视图是webView，还是webView是主视图的一部分？在我的原始代码中，我启动动画，然后使用

[activityImageView startAnimating]将其填充到视图中

和

[self.view addSubview:activityImageView]。当我希望它消失时，如何删除它？当您完成加载后，您希望执行[self.activityImageView removeFromSuperview]以删除活动指示器。您能给我一些示例代码吗？：）比如我如何初始化它（在你的第一段）你的应用程序的结构是什么？你的网络视图在哪里？你的主要观点是什么