iOS web與js的簡單互動

標籤：

我們在封裝網頁的時候經常會遇到需要往網頁裡面的控制項添加資料，但是怎麼添加又成了痛點。本人最近在開發的時候就遇到這樣的事,解決之後，來和大家分享一下。

 

//以必應網站為例

[web loadRequest:

[NSURLRequestrequestWithURL:

[NSURL URLWithString:@"http://www.bing.com/?FORM=Z9FD1"]]];

 

以下就是主要代碼，只有幾句

 

//擷取當前頁面的title

NSString *title =

[webView

stringByEvaluatingJavaScriptFromString:

@"document.title"];

NSLog(@"title====%@",title);

//擷取當前URL

NSString *URL =

[webView

stringByEvaluatingJavaScriptFromString: @"document.location.href"];

NSLog(@"URL===%@",URL);

//得到網頁代碼

NSString *html =

[webView

stringByEvaluatingJavaScriptFromString:

@"document.documentElement.innerHTML" ];

NSLog(@"html====%@",html);

//拼接字串 根據網頁name找到控價並賦值

NSString *str = @"隨_的簡書";

NSString *JSStr =

[NSString stringWithFormat:

@"document.getElementsByName(‘q‘)[0].value = (‘%@‘);",str];

[webView stringByEvaluatingJavaScriptFromString: JSStr];

  以下是全部代碼，commit+c commit+v可以直接運行

 

@interface ViewController ()

@property (weak, nonatomic) UIWebView *web;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

UIWebView *web =

[[UIWebView alloc] initWithFrame:

[UIScreen mainScreen].bounds];

UIButton *back =

[[UIButton alloc] initWithFrame:CGRectMake

(0, 0, self.view.frame.size.width,self.view.frame.size.width / 7.5)];

[back setBackgroundColor: [UIColor orangeColor]];

[back setTitle:@"back" forState:UIControlStateNormal];

[back addTarget:self

action: @selector(back)

forControlEvents:UIControlEventTouchUpInside];

//以必應為例

[web loadRequest:

[NSURLRequest requestWithURL:

[NSURL URLWithString:

@"http://www.bing.com/?FORM=Z9FD1"]]];

web.delegate = self;

web.scalesPageToFit =YES;

web.scrollView.delegate = self;

self.web = web;

[self.view addSubview:web];

[self.view addSubview:back];

}

#pragma mark ---Delegate

-(void) webViewDidStartLoad:

(UIWebView *)webView{

NSLog(@"開始載入－－－") ;

}

- (void) webViewDidFinishLoad:

(UIWebView *)webView {

NSLog(@"載入完成－－－");

//擷取當前頁面的title

NSString *title =

[webView

stringByEvaluatingJavaScriptFromString:

@"document.title"];

NSLog(@"title====%@",title);

//擷取當前URL

NSString *URL =

[webView

stringByEvaluatingJavaScriptFromString:

@"document.location.href"];

NSLog(@"URL===%@",URL);

//得到網頁代碼

NSString *html =

[webView

stringByEvaluatingJavaScriptFromString:

@"document.documentElement.innerHTML" ];

NSLog(@"html====%@",html);

//拼接字串 根據網頁name找到控價並賦值

NSString *str = @"隨_的簡書";

NSString *JSStr =

[NSString stringWithFormat:

@"document.getElementsByName(‘q‘)[0].value = (‘%@‘);",str];

[webView stringByEvaluatingJavaScriptFromString:JSStr];

}

- (void) webView:

(UIWebView *)webView

didFailLoadWithError:(NSError *)error {

NSLog(@"載入失敗＝＝＝%@",error);

}

//當網頁位置為頂部 不允許繼續下拉

- (void) scrollViewDidScroll:

(UIScrollView *)scrollView {

if (self.web.frame.origin.y == 0) {

self.web.scrollView.bounces = NO;

return;

}

}

//webView的每次頁面跳轉都會執行，在這裡可以得到想要的資料

- (BOOL)webView:

(UIWebView *)webView

shouldStartLoadWithRequest:(NSURLRequest *)request

navigationType:(UIWebViewNavigationType)navigationType {

NSLog(@"頁面跳轉");

return YES;

}

//返回

- (void) back {

[self.web goBack];

}

 

iOS web與js的簡單互動