所以我有以下代码:NSString*currSysVer=[[UIDevicecurrentDevice]systemVersion];if([currSysVercompare:@"5.0"options:NSNumericSearch]!=NSOrderedAscending){webScrollView=self.webView_.scrollView;}else{webScrollView=[self.webView_defaultScrollView];}webScrollView.delegate=self当我滚动时，它会给我:-[UIWebViewscrollViewDi