iOS开发-UIWebView

设置UIWebView透明

 [webview setBackgroundColor:[UIColor clearColor]];

 webview.opaque = NO;

禁止UIWebView滚动 

 webView.scrollView.bounces = NO; //__IPHONE_5_0

 UIScrollView *scrollView = (UIScrollView *)[[webView subviews] objectAtIndex:0];
 scrollView.bounces = NO;

获取UIWebView高度

 - (void)webViewDidFinishLoad:(UIWebView *)webView1
 {
     UIScrollView *scrollView = (UIScrollView *)[[webView subviews] objectAtIndex:0];
     CGFloat webViewHeight = [scrollView contentSize].height;
     NSString *curHeight = [webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight;"];

     CGRect newFrame = webView.frame;
     newFrame.size.height = webViewHeight;
     webView.frame = newFrame;
 }

使用JS给UIWebView添加事件响应

1.首先定义事件的JavaScript

 // timeStamp 微秒
 static NSString * const webTouchJavaScriptString =
     @"<script language=\"javascript\">document.ontouchstart=function(event){\
     x=event.targetTouches[0].clientX;\
     y=event.targetTouches[0].clientY;\
     time=event.timeStamp;\
     document.location=\"wiweb:touch:start:\"+x+\":\"+y+\":\"+time;};\
     document.ontouchmove=function(event){\
     x=event.targetTouches[0].clientX;\
     y=event.targetTouches[0].clientY;\
     document.location=\"wiweb:touch:move:\"+x+\":\"+y;};\
     document.ontouchcancel=function(event){\
     document.location=\"wiweb:touch:cancel\";};\
     document.ontouchend=function(event){\
     time=event.timeStamp;\
     document.location=\"wiweb:touch:end:\"+time;}; </script>";

2.组织字符串

 NSString *webviewText = @"<style>body{margin:0;background-color:transparent;color:#000000;word-wrap:break-word;word-break:break-all;font:18px/22px system}</style>";
 NSString *htmlString = [webviewText stringByAppendingFormat:@"%@", @"自定ＳＤＦＳＤＦＳＤＦＳＤＦ义字体fsdgjdlagj asdkgjksdh卡号给卡仕达；逛了会街啊啊流口水 http://www.baidu.com 的感觉卡拉；四大金刚；拉开始打工绿卡；但是结果来看；就爱上的看过就卡的；上来讲赶快来；啊都是经过后ihgoiadsg；肯定是噶上的好；拉克丝的价格爱国阿斯顿改了可"];

 NSString *newHTMLString=[htmlString stringByAppendingString:webTouchJavaScriptString];

3.事件响应

 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
 {
     BOOL result = YES;
     NSURL *requestURL =[[request URL] retain];
     NSString *requestString = [[request URL] absoluteString];
     static BOOL bstart = NO;
     static BOOL bmove = NO;
     static double lasttime = 0;

     NSString *str = [requestURL scheme];
     if ( ([str isEqualToString:@"http"] || [str isEqualToString:@"https"] || [str isEqualToString:@"mailto"] || [str isEqualToString:@"tel"])
         && (navigationType == UIWebViewNavigationTypeLinkClicked) )
     {
         result = ![[UIApplication sharedApplication] openURL:[requestURL autorelease]];
     }
     else
     {
         [requestURL release];
         NSArray *components = [requestString componentsSeparatedByString:@":"];
         if ([components count] > 2
             && [(NSString *)[components objectAtIndex:0] isEqualToString:@"wiweb"]
             && [(NSString *)[components objectAtIndex:1] isEqualToString:@"touch"])
         {
             NSString *eventString=[components objectAtIndex:2];
             if ([eventString isEqualToString:@"start"])
             {
                 float pointX=[[components objectAtIndex:3] floatValue];
                 float pointY=[[components objectAtIndex:4] floatValue];
                 double time=[[components objectAtIndex:5] doubleValue];
                 CGPoint aPoint = CGPointMake(pointX, pointY);
                 NSLog(@"start: %@", NSStringFromCGPoint(aPoint));
                 NSLog(@"start time: %0f   interval: %0f", time/1000, (time - lasttime)/1000);
                 lasttime = time;
                 bstart = YES;
                 bmove = NO;
                 NSLog(@"bstart: %d -- bmove: %d", bstart, bmove);
             }
             else if ([eventString isEqualToString:@"move"])
             {
                 float pointX=[[components objectAtIndex:3] floatValue];
                 float pointY=[[components objectAtIndex:4] floatValue];
                 CGPoint aPoint=CGPointMake(pointX, pointY);
                 NSLog(@"move: %@", NSStringFromCGPoint(aPoint));
                 bmove = YES;
                 NSLog(@"bstart: %d -- bmove: %d", bstart, bmove);
             }
             else if ([eventString isEqualToString:@"cancel"])
             {
                 NSLog(@"cancel");
                 bstart = NO;
                 bmove = NO;
                 NSLog(@"bstart: %d -- bmove: %d", bstart, bmove);
             }
             else if ([eventString isEqualToString:@"end"])
             {
                 double time=[[components objectAtIndex:3] doubleValue];
                 NSLog(@"end");
                 NSLog(@"bstart: %d -- bmove: %d", bstart, bmove);
                 NSLog(@"end time: %0f   interval: %0f", time/1000, (time - lasttime)/1000);
                 if (bstart && !bmove)
                 {
                     if (time - lasttime > 400)
                     {
                         NSLog(@"LongPress!!!!!!");
                     }
                     else
                     {
                         NSLog(@"Click!!!!!!");
                     }
                 }
                 bstart = NO;
                 bmove = NO;
             }

             return NO;
         }
     }

     NSURL *url = [request URL];
     NSString *curUrl= [url absoluteString];
     NSLog(@"cururl: %@", curUrl);

     return result;
 }