用WebView加载本地图片的方法

转自: https://www.cnblogs.com/Rong-Shengcom/p/5431499.html

-(void)setWebView{
    
    self.view.backgroundColor = grayBGColor;

    UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 64, SCREEN_WIDT, SCREEN_HEIGH)];
    webView.backgroundColor = [UIColor whiteColor];
    webView.delegate = self;
    //编码图片
    UIImage *selectedImage = [UIImage imageNamed:@"Guarantee"];
    NSString *stringImage = [self htmlForJPGImage:selectedImage];
    
    //构造内容
    NSString *contentImg = [NSString stringWithFormat:@"%@", stringImage];
    NSString *content =[NSString stringWithFormat:
                        @""
                        ""
                        ""
                        "%@"
                        ""
                        ""
                        , contentImg];
    
    //让self.contentWebView加载content
    [webView loadHTMLString:content baseURL:nil];
    

    
    [self.view addSubview:webView];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    //状态栏不显示网络状态，因为当前内容不是由网络下载的
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    
    CGFloat webViewHeight=[webView.scrollView contentSize].height;
    CGRect newFrame = webView.frame;
    newFrame.size.height = webViewHeight;
    webView.frame = newFrame;

}

//编码图片
- (NSString *)htmlForJPGImage:(UIImage *)image
{
    NSData *imageData = UIImageJPEGRepresentation(image,1.0);
    NSString *imageSource = [NSString stringWithFormat:@"data:image/jpg;base64,%@",[imageData base64Encoding]];
    return [NSString stringWithFormat:@"", imageSource];
}