作者:Mitchell
一 Objective - C 调用 JaveScript
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mitchell</title>
<script type="text/javascript">
function show() {
alert(1);
}
function showTittle() {
alert(document.title);
}
function aaa() {
location.href="https://www.baidu.com/";
}
function btnClick(){
location.href="mitchell://call";
}
function btnClickTwo(){
location.href="mitchell://callWithNumber_?10086";
}
function btnClickThree(){
location.href="mitchell://sendMessageWithNumber_WithContent_?10086&love";
}
</script>
</head>
<body>
<style type="text/css">
.test {
color: blue;
}
#op {
color: orange;
}
.outer table,
.pp {
color: green;
}
input[type=text] {
color: yellow;
}
</style>
<div class="outer">
<label for=“username”>姓名</label>
<button style="background:red; height:150px; weight:150px;" onclick="btnClickThree();">哥是按钮</button>
</div>
</body>
</html>
- (void)viewDidLoad {
[super viewDidLoad];
NSURL*url = [[NSBundle mainBundle] URLForResource:@"test.html" withExtension:nil];
NSURLRequest*request = [NSURLRequest requestWithURL:url];
self.webView.delegate =self;
[self.webView loadRequest:request];
}
-(void)webViewDidFinishLoad:(UIWebView *)webView{
//OC调用JS，只要利用UIWebView的stringByEvaluatingJavaScriptFromString方法，告诉系统
[self.webView stringByEvaluatingJavaScriptFromString:@"show();"];
}
二 JaveScript调用 Objective - C
- JS 代码同上
- Objective - C 中的代码，这里使用了 NSInvocation 封装的一个类，下载地址。
- (void)viewDidLoad {
[super viewDidLoad];
NSURL*url = [[NSBundle mainBundle] URLForResource:@"test.html" withExtension:nil];
NSURLRequest*request = [NSURLRequest requestWithURL:url];
self.webView.delegate =self;
[self.webView loadRequest:request];
}
//每次请求都会调用
//利用该方法作为JS和OC之间的桥梁
//JS跳转网页
//在OC代理方法中通过判断自定义协议头，决定是否是JS调用OC方法
//在OC代理方法中通过截取字符串，获取JS想调用的OC方法名称
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
// NSLog(@"%@",request.URL);
//JS调用OC 无参数
// NSString*schem = @"mitchell://";
// NSString*urlStr = request.URL.absoluteString;
// if ([urlStr hasPrefix:schem]) {
// NSLog(@"调用OC方法");
// //1、从URL汇总获取方法名称
// //Mitchell：//call
// NSString*methodName = [urlStr substringFromIndex:schem.length];
// NSLog(@"%@",methodName);
// //2、调用方法
// SEL sel = NSSelectorFromString(methodName);
// //下面这一行代码是用于指定忽略警告信息
// //忽略警告信息的作用开始
//#pragma clang diagnostic push
// //忽略的警告信息
//#pragma clang diagnostic ignored"-Warc-performSelector-leaks"
// [self performSelector:sel withObject:nil];
// //忽略警告信息的作用结束
//#pragma clang diagnostic pop
//
// return NO;
// }
//1个参数
// NSString*schem = @"mitchell://";
// NSString*urlStr = request.URL.absoluteString;
// if ([urlStr hasPrefix:schem]) {
// NSLog(@"调用OC方法");
// //1、从URL汇总获取方法名称
// NSString*subPath = [urlStr substringFromIndex:schem.length];
// //注意：如果制定的用于切割字符串不存在，就会返回整个字符串
// NSArray*subPaths = [subPath componentsSeparatedByString:@"?"];
// //2、获取方法名称
// NSString*methodName = [subPaths firstObject];
// methodName = [methodName stringByReplacingOccurrencesOfString:@"_" withString:@":"];
// NSLog(@"%@",methodName);
// //3、调用方法
// SEL sel = NSSelectorFromString(methodName);
// NSString*params = nil;
// if (subPaths.count ==2) {
// params = [subPaths lastObject];
// }
// [self performSelector:sel withObject:params];
// return NO;
// }
//2个参数
// NSString*schem = @"mitchell://";
// NSString*urlStr = request.URL.absoluteString;
// if ([urlStr hasPrefix:schem]) {
// NSLog(@"调用OC方法");
// //1、从URL汇总获取方法名称
// NSString*subPath = [urlStr substringFromIndex:schem.length];
// //注意：如果制定的用于切割字符串不存在，就会返回整个字符串
// //sendMessageWithNumber_WithContent_?10086&love
// NSArray*subPaths = [subPath componentsSeparatedByString:@"?"];
// //2、获取方法名称
// NSString*methodName = [subPaths firstObject];
// methodName = [methodName stringByReplacingOccurrencesOfString:@"_" withString:@":"];
// //3、调用方法
// SEL sel = NSSelectorFromString(methodName);
// NSString*param = nil;
// if (subPaths.count ==2) {
// param = [subPaths lastObject];
// //3、截取参数
// NSArray*params = [param componentsSeparatedByString:@"&"];
// [self performSelector:sel withObject:[params firstObject] withObject:[params lastObject]];
// return NO;
// }
// [self performSelector:sel withObject:param];
// return NO;
// }
//多个参数，这里使用了用NSInvocation封装的一个类
NSString*schem = @"mitchell://";
NSString*urlStr = request.URL.absoluteString;
if ([urlStr hasPrefix:schem]) {
NSLog(@"调用OC方法");
//1、从URL汇总获取方法名称
NSString*subPath = [urlStr substringFromIndex:schem.length];
//注意：如果制定的用于切割字符串不存在，就会返回整个字符串
//sendMessageWithNumber_WithContent_?10086&love
NSArray*subPaths = [subPath componentsSeparatedByString:@"?"];
//2、获取方法名称
NSString*methodName = [subPaths firstObject];
methodName = [methodName stringByReplacingOccurrencesOfString:@"_" withString:@":"];
//3、调用方法
SEL sel = NSSelectorFromString(methodName);
NSArray *params = nil;
if (subPaths.count ==2) {
//3、截取参数
params = [[subPaths lastObject] componentsSeparatedByString:@"&"];
[self performSelector:sel withObjects:params];
return NO;
}
[self performSelector:sel withObjects:params];
return NO;
}
return YES;
}
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- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
中写js调用oc的代码