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用途:在ios开发中,经常回用到js调用oc代码的时候,例如在网页上有个拍照和打电话的按钮,想打开系统自带的拍照和电话的时候,就需要用到js调用oc代码的功能。
实现原理:在webView加载html网页的时候,没当发送一个请求,就会调用<UIWebViewDelegate>代理的
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType方法从而实现对oc代码的调用
oc代码如下:
#import "HMViewController.h"
@interface HMViewController () <UIWebViewDelegate>
@end
@implementation HMViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// 1.webView
UIWebView *webView = [[UIWebView alloc] init];
webView.frame = self.view.bounds;
webView.delegate = self;
[self.view addSubview:webView];
// 2.加载网页
NSURL *url = [[NSBundle mainBundle] URLForResource:@"test" withExtension:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
}
#pragma mark - UIWebViewDelegate
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
}
/**
* webView每当发送一个请求之前,都会先调用这个方法(能拦截所有请求)
*/
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSString *url = request.URL.absoluteString;
NSRange range = [url rangeOfString:@"hm://"];
NSUInteger loc = range.location;
if (loc != NSNotFound) { // url的协议头是hm
// 方法名
NSString *method = [url substringFromIndex:loc + range.length];
// 转成SEL
SEL sel = NSSelectorFromString(method);//把url前面没用的去掉。只留剩下的方法名。
[self performSelector:sel withObject:nil];
}
return YES;
}
/**
* 打电话
*/
- (void)call
{
NSLog(@"call----");
}
/**
* 打开照相机
*/
- (void)openCamera
{
NSLog(@"openCamera----");
}
@end
test.html的代码如下:
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<p></p>
<div>
<button onclick="fn_open_camera();">拍照</button>
</div>
<p></p>
<div>
<button onclick="fn_call();">打电话</button>
</div>
<a href="http://www.baidu.com">百度</a>
<script>
function fn_call() {
// 调用OC中call方法
window.location.href = ‘hm://call‘;//hm可以随便写,但是要和oc中截取的协议头一致
}
function fn_open_camera() {
// 调用OC中openCamera方法
window.location.href = ‘hm://openCamera‘;
}
</script>
</body>
</html>
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原文地址:http://www.cnblogs.com/meiyou5866/p/4669498.html