從uiwebview訪問攝像頭？

Question

是否可以從uiwebview訪問iphone的相機？我知道phonegap這樣做，但如何使它在沒有phonegap的情況下工作？

謝謝。

Answer 1

您可以實現UIWebView委託並攔截任何嘗試的頁面加載。通過設置自定義網址，您可以將消息傳遞給Objective C，以便啓動相機。要將數據發送回網絡weiw，您可以啓動一個新的加載（如我在示例中所做的那樣），或者在UIWebView上使用另一種方法傳遞一些JavaScript。

這裏是工作的例子，我只是寫：

#import "WebViewCamAppDelegate.h" 
    #import <UIKit/UIKit.h> 
    @interface uiwebviewcameraAppDelegate : NSObject <UIApplicationDelegate, UINavigationControllerDelegate, UIImagePickerControllerDelegate, UIWebViewDelegate> { 
     UIWindow *window; 
    UIViewController *viewController; 
    UIWebView *webView; 
    } 

    @property (nonatomic, retain) IBOutlet UIWindow *window; 

    @end 


    @implementation uiwebviewcameraAppDelegate 

    @synthesize window; 

    //This is the HTML we initially show in the WebView. Note the url "showcamera:" is one I 
    //invented with the intent to intercept it to show the camera. 
    static NSString *htmlString = @"<br><A href=\"showcamera:\">Show Camera</a>"; 


    //Pretty Basic stuff. We set the UIWebView Delegate so we can intercept the call and set up  //a ViewController so we can animate the UIImagePicker 
    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  
    viewController = [[UIViewController alloc] init]; 

    webView = [[UIWebView alloc] initWithFrame:window.bounds]; 
    [webView loadHTMLString:htmlString baseURL:nil]; 
    webView.delegate = self; 

    [viewController.view addSubview:webView]; 
    [window addSubview:viewController.view]; 
     [window makeKeyAndVisible]; 
    return YES; 
    } 

    //Note: I check to make sure the camera is available. If it is not (iPod touch or Simulator) I show the photo library instead. 
    -(void) showCamera { 
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; 
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { 
     imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; 
    } 
    else { 
     imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
    } 
    imagePicker.delegate = self; 
    [viewController presentModalViewController:imagePicker animated:YES]; 
    } 

    //Here we intercept any time the webview tries to load a document. When the user hits our "showcamera: url" we go to work. 
    - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { 
    if ([[[request URL] scheme] isEqualToString:@"showcamera"]) { 
     [self showCamera]; 
     return NO; 
    } 
    return YES; 
    } 

    //After the imagepicker has done it's thing, we pass the data back to the webview to be displayed. 
    //If we wanted to be fancy here, we could have done this via Javascript so we could dynamically insert an image without reloading the page. 
    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 
    [viewController dismissModalViewControllerAnimated:YES]; 
    UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage]; 
    NSData *imageData = UIImageJPEGRepresentation (image, 0.5); 
    [webView loadData:imageData MIMEType:@"image/jpeg" textEncodingName:@"UTF-8" baseURL:nil]; 
    } 


    - (void)dealloc { 
    [viewController release]; 
    [webView release]; 
     [window release]; 
     [super dealloc]; 
    } 

    @end