在uiwebview上添加活动指示器

Question

我有一个viewDidLoad,它创建一个Web视图并启动一个活动指示器.如何仅在网页出现时停止活动指示器？如何在"加载"等活动指标中添加单词？

// Create the UIWebView
UIWebView *webView = [[UIWebView alloc] initWithFrame:self.view.bounds];

[self.view addSubview:webView];

// Start the throbber to check if the user exists
UIActivityIndicatorView *activityView=[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activityView.center = CGPointMake([self screenWidth] / 2.0, 370.0);
[activityView startAnimating];
activityView.tag = 100;
[self.view addSubview:activityView];

NSString* url = @"http://google.com";
NSURL* nsUrl = [NSURL URLWithString:url];
NSURLRequest* request = [NSURLRequest requestWithURL:nsUrl cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:30];


// Remove activity view
UIView *viewToRemove = [self.view viewWithTag:100];
//[viewToRemove removeFromSuperview];

[webView loadRequest:request];

Answer 1

加载视图:

@implementation yourViewController{;
    UIView* loadingView;
}

在你的viewDidLoad:

loadingView = [[UIView alloc]initWithFrame:CGRectMake(100, 400, 80, 80)];
loadingView.backgroundColor = [UIColor colorWithWhite:0. alpha:0.6];
loadingView.layer.cornerRadius = 5;

UIActivityIndicatorView *activityView=[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
activityView.center = CGPointMake(loadingView.frame.size.width / 2.0, 35);
[activityView startAnimating];
activityView.tag = 100;
[loadingView addSubview:activityView];

UILabel* lblLoading = [[UILabel alloc]initWithFrame:CGRectMake(0, 48, 80, 30)];
lblLoading.text = @"Loading...";
lblLoading.textColor = [UIColor whiteColor];
lblLoading.font = [UIFont fontWithName:lblLoading.font.fontName size:15];
lblLoading.textAlignment = NSTextAlignmentCenter;
[loadingView addSubview:lblLoading];

[self.view addSubview:loadingView];

此视图将如下所示:

要小心,如果你想使用cornerRadius,你必须在导入<QuartzCore/QuartzCore.h>之前导入框架和corse,将QuartzCore框架添加到你的项目中!

检测webview停止加载时:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    [loadingView setHidden:YES];
}

你必须实现UIWebViewDelegate协议,和

webView.delegate = self;

并使其可见:

- (void)webViewDidStartLoad:(UIWebView *)webView {

 [loadingView setHidden:NO];

}

Answer 2

如何仅在网页出现时停止活动指示器？

你的目标可以成为delegate对webView听-webViewDidFinishLoad委托方法.所以:

- (void)viewDidLoad {
    // Create the UIWebView
    UIWebView *webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
    webView.delegate = self; // Here is the key
    ...
}

...

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    [self.view viewWithTag:100].hidden = YES;
}

您还可以实现-webViewDidStartLoad:显示活动指示器而不是在-viewDidLoad方法中显示它.

如何在"加载"等活动指标中添加单词？

你应该创建一个单独的UILabel,没有办法将文本添加到标准UIActivityIndicatorView

Answer 3

如果你在Swift上寻找这个,这里是:

var boxView = UIView()

func webViewDidStartLoad(webView_Pages: UIWebView) {

    // Box config:
    boxView = UIView(frame: CGRect(x: 115, y: 110, width: 80, height: 80))
    boxView.backgroundColor = UIColor.blackColor()
    boxView.alpha = 0.9
    boxView.layer.cornerRadius = 10

    // Spin config:
    let activityView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.WhiteLarge)
    activityView.frame = CGRect(x: 20, y: 12, width: 40, height: 40)
    activityView.startAnimating()

    // Text config:
    let textLabel = UILabel(frame: CGRect(x: 0, y: 50, width: 80, height: 30))
    textLabel.textColor = UIColor.whiteColor()
    textLabel.textAlignment = .Center
    textLabel.font = UIFont(name: textLabel.font.fontName, size: 13)
    textLabel.text = "Loading..."

    // Activate:
    boxView.addSubview(activityView)
    boxView.addSubview(textLabel)
    view.addSubview(boxView)
}

func webViewDidFinishLoad(webView_Pages: UIWebView) {

    // Removes it:
    boxView.removeFromSuperview()

}

别忘了调用UIWebViewDelegate:

class ViewController: UIViewController, UIWebViewDelegate {

并在viewDidLoad上设置webView的委托:

webView.delegate = self