UIWebview中的NSString

Question

我的项目中有一个NSString和一个webView(iPhone的Objective-C),我index.html在webView中调用,在里面我插入了我的脚本(javascript).

如何在我的脚本中将NSString作为var传递,反之亦然？

这是一个例子,但我不太了解它.

Answer 1

将字符串发送到Web视图:

[webView stringByEvaluatingJavaScriptFromString:@"YOUR_JS_CODE_GOES_HERE"];

从Web视图发送字符串到Obj-C:

声明您实现了UIWebViewDelegate协议(在.h文件中):

@interface MyViewController : UIViewController <UIWebViewDelegate> {

    // your class members

}

// declarations of your properties and methods

@end

在Objective-C中(在.m文件中):

// right after creating the web view
webView.delegate = self;

在Objective-C(在.m文件中)也是:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSString *url = [[request URL] absoluteString];

    static NSString *urlPrefix = @"myApp://";

    if ([url hasPrefix:urlPrefix]) {
        NSString *paramsString = [url substringFromIndex:[urlPrefix length]];
        NSArray *paramsArray = [paramsString componentsSeparatedByString:@"&"];
        int paramsAmount = [paramsArray count];

        for (int i = 0; i < paramsAmount; i++) {
            NSArray *keyValuePair = [[paramsArray objectAtIndex:i] componentsSeparatedByString:@"="];
            NSString *key = [keyValuePair objectAtIndex:0];
            NSString *value = nil;
            if ([keyValuePair count] > 1) {
                value = [keyValuePair objectAtIndex:1];
            }

            if (key && [key length] > 0) {
                if (value && [value length] > 0) {
                    if ([key isEqualToString:@"param"]) {
                        // Use the index...
                    }
                }
            }
        }

        return NO;
    }
    else {
        return YES;
    }
}

里面的JS:

location.href = 'myApp://param=10';