[英]Call objective-c method from javascript
I make any webView And I want to call from javascript any objective c method which return any parameter. 我做任何webView我想从javascript调用任何返回任何参数的Objective c方法。 I tried many ways but not allowed .
我尝试了很多方法,但不允许。 Objective c method here:
这里的客观方法:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL *URL = [request URL];
if ([[URL scheme] isEqualToString:@"donordialog"])
{
// now we need to figure out the function part
NSString *functionString = [URL resourceSpecifier];
if ([functionString hasPrefix:@"bloodTypeChanged"])
{
// the blood type has changed, now do something about it.
NSString *parameter = [functionString stringByReplacingOccurrencesOfString:@"bloodTypeChanged" withString:@""];
// remove the '(' and then the ')'
parameter = [parameter stringByReplacingOccurrencesOfString:@"(" withString:@""];
parameter = [parameter stringByReplacingOccurrencesOfString:@")" withString:@""];
// log the paramter, as I don't know what to do with it right now
UIAlertView *alert=[[ UIAlertView alloc] initWithTitle:@"iosdan javascripti"
message:@"ddddddddd"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
//NSLog(@"%@", parameter);
}
return NO;
}
return YES;
}
javascript: JavaScript的:
function myFunction() {
url="http://example.com";
window.location="donordialog:blooTypeChanged("+url+")";
}
html: HTML:
<button onclick="myFunction()">click me</button>
comment: I need that: it is obj c method for example. 评论:我需要:例如,它是obj c方法。 aaa{} .
aaa {}。 My aaa method must return any parameter.
我的aaa方法必须返回任何参数。 and I have wevView.
我有wevView。 I loaded any url to this webView: for example www.example.com/forios .
我将任何网址加载到此webView:例如www.example.com/forios。 I need call this (aaa) method from javascript which it is in html on www.example.com/forios and alert the result of aaa function.
我需要从javascript调用这个(aaa)方法,它在www.example.com/forios上的html中,并提醒aaa函数的结果。 understand?.
了解?。 If understand, dont watch to my code.
如果明白,不要看我的代码。 help please yourself anyway.
无论如何,请帮助自己。 android version of my question: Call Java function from JavaScript over Android WebView I want to alert some parameter returning from method.
我的问题的android版本: 通过Android WebView从JavaScript调用Java函数我想提醒一些从方法返回的参数。 Help please.
请帮忙。 Thanks.
谢谢。
Here is a quick and easy solution without JavaScriptCore for backwards compatibility (might consider upgrading to Javascriptcore ). 这是一个快速简单的解决方案, 没有 JavaScriptCore可以向后兼容(可能会考虑升级到Javascriptcore)。 Here's an easy implementation.
这是一个简单的实现。
Note: this solution is for UIwebview only (not UIscrollview) 注意:此解决方案仅适用于UIwebview(不是UIscrollview)
//viewcontroller.h //viewcontroller.h
@interface ViewController : UIViewController<UIWebViewDelegate>
@property (strong, nonatomic) IBOutlet UIWebView *viewWeb;
@end
//viewcontroller.m //viewcontroller.m
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *fullURL = @"http:player.fusion.fm";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[_viewWeb loadRequest:requestObj];
_viewWeb.delegate = self;
}
-(BOOL)webView:(UIWebView *)_viewWeb shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = request.URL;
if ([[url scheme] isEqualToString:@"ios"])
{
[self mute]; // <-- YOUR OBJ-C FUNCTION HERE
NSLog(@"test");
return YES;
}else
{
return YES;
}
}
// The Javascript (within webview) // Javascript(在webview中)
try
{
window.location="ios://null"
}
catch(err)
{
}
Source: http://adoptioncurve.net/archives/2012/09/calling-objective-c-methods-from-javascript-in-a-uiwebview/ 资料来源: http : //adoptioncurve.net/archives/2012/09/calling-objective-c-methods-from-javascript-in-a-uiwebview/
The most usual approach that I used to interact from javascript within obj-c is to changing hash. 我用来与obj-c中的javascript进行交互的最常用方法是更改哈希。 On required event in your js write
window.location.hash = '#cmd_alertMessage';
在js中的必需事件中写入
window.location.hash = '#cmd_alertMessage';
after this your - (BOOL)webView: shouldStartLoadWithRequest: navigationType:
will be called: 在此之后你的
- (BOOL)webView: shouldStartLoadWithRequest: navigationType:
将被调用:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSArray * compenents = [request.URL.absoluteString componentsSeparatedByString:@"#"];
if (compenents.count > 1) {
NSString * cmd = compenents[1];
if ([cmd rangeOfString:@"cmd_alertMessage"].location != NSNotFound) {
// Call your obj-c method and get appropriated param
NSString * jsFunction = [NSString stringWithFormat:@"setParameterFromAAAMethod('%@')", [self aaa]];
// Return this param back to js
NSString * alertMessage = [webView stringByEvaluatingJavaScriptFromString:jsFunction];
}
}
return YES;
}
- (NSString *)aaa
{
return @"This is special parameter that you need";
}
So, it will work in 3 steps: 所以,它将分3个步骤:
You can set a hidden iframe's location to something specific to your app, and then intercept that request in Obj-C. 您可以将隐藏的iframe位置设置为特定于您的应用的内容,然后在Obj-C中拦截该请求。
Here's an overview and some examples: http://blog.techno-barje.fr//post/2010/10/06/UIWebView-secrets-part3-How-to-properly-call-ObjectiveC-from-Javascript/ 以下是概述和一些示例: http : //blog.techno-barje.fr//post/2010/10/06/UIWebView-secrets-part3-How-to-properly-call-ObjectiveC-from-Javascript/
Well, I am not sure whether I got your question correct or not, but if you want to call any javascript method, then you can do this way:- 好吧,我不确定我的问题是否正确,但是如果你想调用任何javascript方法,那么你可以这样做: -
[yourWebView stringByEvaluatingJavaScriptFromString:@"yourMethodName()"];
You can also pass parameters in above method. 您也可以在上面的方法中传递参数。
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