JS调用OC简单实例－传递一个或者多个参数给oc方法

////  ViewController.m//  JSCallsOC////  Created by hq on 16/4/19.//  Copyright © 2016年 hanqing. All rights reserved.//#import "ViewController.h"#import "NSObject+PerformSelector.h"@interface ViewController () <UIWebViewDelegate>@property (weak, nonatomic) IBOutlet UIWebView *webView;@end@implementation ViewController-(BOOL) prefersStatusBarHidden{    return YES;}- (void)viewDidLoad {        [super viewDidLoad];        NSURL *url=[[NSBundle mainBundle] URLForResource:@"index" withExtension:@"html"];        [self.webView loadRequest:[NSURLRequest requestWithURL:url]];        self.webView.delegate=self;    }-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{        //js调用oc原理，通过特殊的url解析方法，然后调用oc的相应方法        NSString *urlString=request.URL.absoluteString;        //我们制定了一个协议，调用oc的方法都以hq://开头，后边跟着方法名        NSString *scheme=@"hq://";        //如果是我们自定义的协议hq://call    if ([urlString hasPrefix:scheme]) {                //取出scheme后边的路径        NSString *path=[urlString substringFromIndex:scheme.length];                //根据?区分出方法名  参数        NSArray *array=[path componentsSeparatedByString:@"?"];                NSLog(@"%@",array);                        NSString *methodName=array.firstObject;        //将方法名中的_变成:        methodName=[methodName stringByReplacingOccurrencesOfString:@"_" withString:@":"];                NSString *parameter=array.lastObject;                NSArray *parameters=nil;                if (array.count==2) {            //继续分解我们的变量            parameters=[parameter componentsSeparatedByString:@"&"];        }          [self performSelector:NSSelectorFromString(methodName) withObjects:parameters];                return NO;             }        return YES;}-(void) call{        NSLog(@"没有参数的情况－－打电话给");}-(void) call:(NSString *) number{        NSLog(@"一个参数的情况－－打电话给%@",number);    }-(void) call:(NSString *) number number2:(NSString *) number2{        NSLog(@"2个参数的情况－－打电话给%@ %@",number,number2);}-(void) call:(NSString *) number number2:(NSString *) number2 number3:(NSString *) number3{        NSLog(@"3个参数的情况－－打电话给%@ %@ %@",number,number2,number3);    }- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];}@end

////  NSObject+PerformSelector.m//  JSCallsOC////  Created by hq on 16/4/19.//  Copyright © 2016年 hanqing. All rights reserved.//#import "NSObject+PerformSelector.h"@implementation NSObject (PerformSelector)- (id)performSelector:(SEL)aSelector withObjects:(NSArray *)objects{        NSMethodSignature *signature=[self.class instanceMethodSignatureForSelector:aSelector];        //如果没有该方法    if (!signature) {                @throw [NSException exceptionWithName:@"没有该方法啊" reason:@"你确定有这个方法？" userInfo:nil];                //[NSException raise:@"出落喽" format:@"方法找不到啊 %@",NSStringFromSelector(aSelector)];    }        NSInvocation *invocation=[NSInvocation invocationWithMethodSignature:signature];        invocation.target=self;        invocation.selector=aSelector;        //处理参数传多了异常    //for (int i=0; i<objects.count; i++) count得用我们方法名当中参数多个数，这样用户即使传多了，也不受影响        //设置参数    //获取方法多参数个数，注意其默认包含了self，_cmd  signature.numberOfArguments所以要－2        //处理有一个活多个参数，但参数为空的问题    NSInteger count= MIN(signature.numberOfArguments-2, objects.count);        for (NSInteger i=0; i<count; i++) {                id object=objects[i];                [invocation setArgument:&object atIndex:2+i];    }    [invocation invoke];        //获取返回值    id returnValue=nil;        if (signature.methodReturnLength) {                [invocation getReturnValue:&returnValue];    }        return returnValue;}@end