獲取UIWebView高度
- (void)webViewDidFinishLoad:(UIWebView *)webView {
// 如果要獲取webView高度必須在網(wǎng)頁(yè)加載完成之后獲取
// 方法一
CGFloat height = [self.webView sizeThatFits:CGSizeZero].height;
// 方法二
CGFloat height = webView.scrollView.contentSize.height;
// 方法三 （不推薦使用，當(dāng)webView.scalesPageToFit = YES計(jì)算的高度不準(zhǔn)確）
CGFloat height = [[self.webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];
}
UIWebView加載完成后cell高度的更新，使用通知來實(shí)現(xiàn)。
TableViewCell.m
- (void)webViewDidFinishLoad:(UIWebView *)webView {
CGSize fittingSize = [self.webView sizeThatFits:CGSizeZero];
self.height = fittingSize.height;
self.webView.frame = CGRectMake(0, 0, fittingSize.width, fittingSize.height);
// 用通知發(fā)送加載完成后的高度
[[NSNotificationCenter defaultCenter] postNotificationName:@"WEBVIEW_HEIGHT" object:self userInfo:nil];
}
ViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
// 用于緩存cell高度
self.heightDic = [[NSMutableDictionary alloc] init];
// 注冊(cè)加載完成高度的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(noti:) name:@"WEBVIEW_HEIGHT" object:nil];
}
- (void)noti:(NSNotification *)sender {
TableViewCell *cell = [sender object];
if (![self.heightDic objectForKey:[NSString stringWithFormat:@"%ld",cell.tag]]||[[self.heightDic objectForKey:[NSString stringWithFormat:@"%ld",cell.tag]] floatValue] != cell.height) {
[self.heightDic setObject:[NSNumber numberWithFloat:cell.height] forKey:[NSString stringWithFormat:@"%ld",cell.tag]];
[self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:cell.tag inSection:0]] withRowAnimation:UITableViewRowAnimationNone];
}
}
ios-webview-cell-1.png
參考
