UIWebView - 4

来源：互联网发布：手机做题软件编辑：程序博客网时间：2024/06/14 14:16

UIWebView还提供了强大的与服务器交互的方法，提供了操作JS的接口：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;

我们可以通过回调获取，服务器回调的地址：

NSString* urlStr = [[request URL] absoluteString];

并通过字符操作操作，获取想要的标识符号：

有两个比较好的方式：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{    NSArray* substrs = [urlStr componentsSeparatedByString:@"://"];    NSInteger  value = [self switchFromIdentifier:[substrs objectAtIndex:0]];        switch (value){                    case 1:{            // do sth about 1.        }            break;                    case 2:{            // do sth about 2.        }            break;        case 3:{            // do sth about 3.        }            break;        default            break;}

- (NSInteger )switchFromIdentifier:(NSString *)urlStr{    NSInteger value = 0;    if ([urlStr isEqualToString:@"identifier1"]){        value = 1;      }else if ([urlStr isEqualToString:@"identifier2"]){        value = 2;      }else if ([urlStr isEqualToString:@"identifier3"]){        value = 3;     }else if ([urlStr isEqualToString:@"identifier4"]){        value = 4;    }    return value;}

还有直接和服务器协商用字段作为操作名：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {    // 说明协议头是ios    if ([@"ios" isEqualToString:request.URL.scheme]) {        NSString *url = request.URL.absoluteString;        NSRange range = [url rangeOfString:@":"];        NSString *method = [request.URL.absoluteString substringFromIndex:range.location + 1];                SEL selector = NSSelectorFromString(method);                if ([self respondsToSelector:selector]) {            [self performSelector:selector];        }                return NO;    }        return YES;}#pragma mark - 提供一个接口方法给JS调用- (void)openCamera {    NSLog(@"打开了照相机");}- (void)call {    NSLog(@"打电话");}#pragma mark - 按钮方法#pragma mark 前进- (void)forawrd {    [self.webView goForward];}#pragma mark 后退- (void)back {    [self.webView goBack];}

对的，UIWebView还提供了一些直接的操作返回前进前后页面等其他操作：

- (void)goBack;- (void)goForward;

参考：

http://blog.csdn.net/zhaoweixing1989/article/details/13021513

http://www.cnblogs.com/gcb999/p/3178728.html

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