iOS:在OC中调用JS脚本

#import "ViewController.h"
#import <JavaScriptCore/JavaScriptCore.h>#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height@interface ViewController ()<UIWebViewDelegate>
@property (strong,nonatomic)UIWebView *webView;
@property (assign,nonatomic)BOOL isFirstLoadWeb;
@end@implementation ViewController- (void)viewDidLoad {
[super viewDidLoad]; self.webView = [[UIWebView alloc]initWithFrame:self.view.bounds];
self.webView.scalesPageToFit = YES;
self.webView.backgroundColor = [UIColor clearColor];
self.webView.delegate = self;
[self.view addSubview:self.webView];
NSURL *URL = [NSURL URLWithString:@"http://m.baidu.com"];
NSURLRequest *request = [[NSURLRequest alloc]initWithURL:URL];
[self.webView loadRequest:request];
}

-(void)webViewDidFinishLoad:(UIWebView *)webView{ //程序会一直调用该方法,所以判断若是第一次加载后使用我们自定义的js,此后不再调用JS,否则会出现网页抖动现象
if (!_isFirstLoadWeb) {
_isFirstLoadWeb = YES; //获取当前页面的url
NSString *url = [webView stringByEvaluatingJavaScriptFromString:@"document.location.href"];
//获取页面的title
NSString *title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"]; NSLog(@"%@----%@",url,title); //给webView添加一个自定义的JavaScript
[webView stringByEvaluatingJavaScriptFromString:@"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = \"function myFuncation(){"
"var field = document.getElementsByName('word')[0];"
"field.value = '夏先森的博客园';"
"document.forms[0].submit();"
"}\";"
"document.getElementsByTagName('head')[0].appendChild(script);"]; //开始调用自定义的JavaScript
[webView stringByEvaluatingJavaScriptFromString:@"myFuncation();"]; }else{
return;
}
}@end

-- ::24.670 OC调用JS[:] https://m.baidu.com/----百度一下

#import "ViewController.h"
#import <JavaScriptCore/JavaScriptCore.h>#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height@interface ViewController ()<UIWebViewDelegate>
@property (strong,nonatomic)UIWebView *webView;
@property (strong,nonatomic)UIActivityIndicatorView *activityIndicator;
@property (strong,nonatomic)UISlider *slider;
@end@implementation ViewController- (void)viewDidLoad {
[super viewDidLoad]; //1.创建slider
_slider = [[UISlider alloc]initWithFrame:CGRectMake(, , SCREEN_WIDTH-, )];
[_slider addTarget:self action:@selector(SliderChanged) forControlEvents:UIControlEventValueChanged];
_slider.maximumValue = 1000.0f;
_slider.minimumValue = 10.0f;
_slider.value = 10.0f;
[self.view addSubview:_slider]; //2.创建webView
self.webView = [[UIWebView alloc]initWithFrame:CGRectMake(, , SCREEN_WIDTH, SCREEN_HEIGHT-)];
self.webView.scalesPageToFit = YES;
self.webView.backgroundColor = [UIColor clearColor];
self.webView.delegate = self;
[self.view addSubview:self.webView];
NSURL *URL = [NSURL URLWithString:@"http://m.baidu.com"];
NSURLRequest *request = [[NSURLRequest alloc]initWithURL:URL];
[self.webView loadRequest:request]; //3.创建活动指示器
_activityIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(, , , )];
_activityIndicator.center = self.view.center;
_activityIndicator.backgroundColor = [UIColor grayColor];
_activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
[self.view addSubview:_activityIndicator];
}

-(void)SliderChanged{
NSString *str1 = [NSString stringWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust = '%f%%'",_slider.value]; [_webView stringByEvaluatingJavaScriptFromString:str1];
}
@end