XCode自定義活動指標 - 在UIWebView加載後隱藏（webViewDidFinishLoad）

我使用此處找到的代碼http://blog.blackwhale.at/?p=336在當前版本的xCode中創建自定義activityIndicator。此代碼在數組中使用一系列.png圖像，然後按照設定的時間間隔顯示它們，以創建一個動畫加載圖像，然後您可以隨時放置在屏幕上（並假設您可以以某種方式將其刪除）。XCode自定義活動指標 - 在UIWebView加載後隱藏（webViewDidFinishLoad）

在我的主要ViewController.m文件，我在我的viewDidLoad部分添加以下代碼：

/* --- 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 */

我想清楚了/刪除/隱藏activityImageView元素，因爲我只希望它表明，當應用首先啓動，直到UIWebView完成加載。

我想調用這個和有GIF出現而webViewDidStartLoad，然後清除時webViewDidFinishLoad。有人幫忙？

來源

2012-07-10 adamdehaven

您是否嘗試過只是從當前視圖中刪除activityImageView動畫完成後？或者更好的是，改變能見度？或者，也許我不明白什麼阻止你在你提到的兩個函數中調用它，也許你可以澄清你遇到的問題？ – 2012-07-10 20:39:01

你能告訴我該怎麼做嗎？ :)喜歡什麼代碼，並把它放在哪裏？我趕上很快。這個問題（我認爲我有，但老實說，我不知道）是'activityImageView'不能在'viewDidLoad'部分之外訪問...？ – adamdehaven 2012-07-10 20:41:43

好的，我知道你需要做什麼，我會在答案部分發布。 – 2012-07-10 20:43:00

好了，這樣就不能訪問activityImageView的原因是因爲它在聲明瞭viewDidLoad函數。把它作爲一個屬性添加到你的ViewController類，你應該能夠做你想做的。確保你從viewDidLoad中刪除了activityImageView的聲明，並在那裏初始化它。

而且，當是要顯示活動的指標你的WebView？它是否有獨立的視圖控制器，還是包含在主視圖控制器中？這聽起來像你的activityImageView的範圍是不正確的，雖然不知道你如何設置它有點難以告訴你在哪裏放置它。

在您使用在這兩個地方的活動的指標，在應用程序你打算使用它再次運行時間，否則將永遠只能是可見的，如果你重新加載應用程序？取決於你想要隱藏它的答案，或者從你的主視圖中刪除它。

UIImageView.hidden是什麼控制的知名度。

編輯，代碼的要求：

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 
}

來源

2012-07-10 20:44:02

你能給我一些示例代碼？ :)像我將如何初始化它（在你的第一段） – adamdehaven 2012-07-10 20:50:30

什麼是你的應用程序的結構？你的webView在哪裏？您的主視圖是webView還是主視圖的webView部分？ – 2012-07-10 21:00:23

在我的原始代碼中，我開始動畫，然後用'[activityImageView startAnimating];''和'[self.view addSubview：activityImageView];'將其填充到視圖中。當我想讓它消失時，我該如何刪除它？ – adamdehaven 2012-07-10 21:01:44

聲明你activityImageView在你的頭文件的屬性，並在您viewDidLoad:方法來配置它

您應該添加在UIWebViewDelegate方法

- (void)webViewDidStartLoad:(UIWebView *)webView

您activityImageView然後stopAnimating和removeFromSuperview在UIWebViewDelegate方法

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

您應該閱讀UIImageView documentation和UIWebViewDelegate protocol reference

UPDATE

在您的標題：

@property(nonatomic, retain) UIImageView *activityImageView;

在您的實現

@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]; 
}

來源

2012-07-10 20:43:03

如何在我的viewDidLoad方法中配置它？以及如何在UIWebViewDelegate方法中添加我的activityImageView？你能更新你的代碼嗎？我會是SOOO欣賞:) – adamdehaven 2012-07-10 20:52:33

你應該是這樣的：

- (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]; 
    } 

}

來源

2013-09-30 02:58:26

XCode自定義活動指標 - 在UIWebView加載後隱藏（webViewDidFinishLoad）

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