![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIyZuBnL0gDOwETNwETM4IzNwAjMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
此处注入js,无需等待所有内容加载完毕
- (void)webViewDidStartLoad:(UIWebView *)webView{
[self performSelector:@selector(addWaterAction) withObject:self afterDelay:1];
}
- (void)addWaterAction{
[self addWater];
}
此处注入js,可能要等所有内容加载完毕,才能添加水印上去
- (void)webViewDidFinishLoad:(UIWebView *)webView{
[self addWater];
}
- (void)addWater{
[self.myWebView stringByEvaluatingJavaScriptFromString:[self getWaterMarkString]];
//1 获取JSContext
// JSContext *context = [self.myWebView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
// NSString *jsMethondAction = @"watermark_show({ watermark_txt: \"aaaad\",watermark_y:65});";
// [context evaluateScript:jsMethondAction];
// 2
[self.myWebView stringByEvaluatingJavaScriptFromString:@"watermark_show({ watermark_txt: \"aaaad\",watermark_y:65});"];
}
要注入的js添加水印方法
- (NSString *)getWaterMarkString{
NSString *str = @"function watermark_show(settings) {\
var defaultSettings={\
watermark_txt: \"wwwww\",\
watermark_x : 50,\
watermark_y : 50,\
watermark_cols : 3,\
watermark_rows : 4,\
watermark_x_space : 50,\
watermark_y_space : 60,\
watermark_color : '#000000',\
watermark_alpha : 0.2,\
watermark_fontsize : '20px',\
watermark_font : '微软雅黑',\
watermark_width : 100,\
watermark_height : 70,\
watermark_angle : 20\
};\
if(arguments.length===1&&typeof arguments[0] ===\"object\" ){\
var src=arguments[0]||{};\
for(key in src){\
if(src[key]&&defaultSettings[key]&&src[key]===defaultSettings[key])\
continue;\
else if(src[key])\
defaultSettings[key]=src[key];\
}\
}\
var oTemp = document.createDocumentFragment();\
var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth,window.screen.width);\
var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight,window.screen.height);\
if (defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width *defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) > page_width)) {\
defaultSettings.watermark_cols = parseInt((page_width-defaultSettings.watermark_x+defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));\
defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));\
}\
if (defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) > page_height)) {\
defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));\
defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));\
}\
var x;\
var y;\
for (var i = 0; i < defaultSettings.watermark_rows; i++) {\
y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;\
for (var j = 0; j < defaultSettings.watermark_cols; j++) {\
x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;\
var mask_div = document.createElement('div');\
mask_div.id = 'mask_div' + i + j;\
mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));\
mask_div.style.webkitTransform = \"rotate(-\" + defaultSettings.watermark_angle + \"deg)\";\
mask_div.style.MozTransform = \"rotate(-\" + defaultSettings.watermark_angle + \"deg)\";\
mask_div.style.msTransform = \"rotate(-\" + defaultSettings.watermark_angle + \"deg)\";\
mask_div.style.OTransform = \"rotate(-\" + defaultSettings.watermark_angle + \"deg)\";\
mask_div.style.transform = \"rotate(-\" + defaultSettings.watermark_angle + \"deg)\";\
mask_div.style.visibility = \"\";\
mask_div.style.position = \"absolute\";\
mask_div.style.left = x + 'px';\
mask_div.style.top = y + 'px';\
mask_div.style.overflow = \"hidden\";\
mask_div.style.zIndex = \"9999\";\
mask_div.style.opacity = defaultSettings.watermark_alpha;\
mask_div.style.filter=\"alpha(opacity='10')\";\
mask_div.style.fontSize = defaultSettings.watermark_fontsize;\
mask_div.style.fontFamily = defaultSettings.watermark_font;\
mask_div.style.color = defaultSettings.watermark_color;\
oTemp.appendChild(mask_div);\
};\
};\
document.body.appendChild(oTemp);\
}";
return str;
}