- 初始化時進行注入
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
//實際上注入js文件和注入js代碼字符串沒有區別,因爲也要把JS文件讀取爲字符串進行調用
NSString *js = [[NSBundle mainBundle] pathForResource:@"demo/canvas.js" ofType:nil];
NSData *jsData=[NSData dataWithContentsOfFile:js];
NSString *jsString = [[NSString alloc] initWithData:jsData encoding:NSUTF8StringEncoding];
WKUserScript *jsScript = [[WKUserScript alloc]initWithSource:jsString injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES];
[config.userContentController addUserScript:jsScript];
_webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
- 頁面加載完畢進行注入(當然也可以使用初始化時注入,
injectionTime
改爲WKUserScriptInjectionTimeAtDocumentEnd
),一般是先在start時注入,end時進行調用
//便利宏: 避免書寫大量的反斜槓轉義或者換行
#define JS(...) [[NSString alloc] initWithCString:#__VA_ARGS__ encoding:NSUTF8StringEncoding]
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {
self.title = webView.title;
//注入js
[webView evaluateJavaScript:JS(
alert('你好,JS');
console.log('hello JS');
) completionHandler:nil];
}