为什么在使用UIWebView加载HTMLString时,UIWebView的工作如此缓慢?
在我的APP中, loadHTMLString
大约需要10秒钟,谁能指出问题所在?
It take about 10s to loadHTMLString
in my APP, who can point out what's the problem?
- (void)viewDidLoad {
[super viewDidLoad];
webView = [[UIWebView alloc]initWithFrame:CGRectMake(10, 10, SCREEN_WIDTH, 480)];
[webView setBackgroundColor:[UIColor clearColor]];
[webView setOpaque:NO];
webView.delegate = self;
[scrollView addSubview:webView];
}
进入视图后,如果我收到消息:
After enter the view, If I receive message:
- (void)updateJournalView:(NSArray *)journals {
NSString *descHtml = [self getHtmlDesc:journals];
[webView loadHTMLString:descHtml baseURL:nil];
}
getHtmlDesc
方法将快速返回html字符串.
getHtmlDesc
method will return the html string quickly.
从加载日志中,您可以看到加载大约需要5秒钟.
from load log, you can see it take about 5s to load.
2012-11-26 20:34:35.322测试[8456:c07] ====开始加载2012-11-26 12:34:35 +0000:
2012-11-26 20:34:35.322 test[8456:c07] ====start load 2012-11-26 12:34:35 +0000:
2012-11-26 20:34:39.890测试[8456:c07] ====完成加载2012-11-26 12:34:39 +0000:
2012-11-26 20:34:39.890 test[8456:c07] ====finish load 2012-11-26 12:34:39 +0000:
以下是UIWebViewDelegate方法:
Following is UIWebViewDelegate method:
- (void)webViewDidFinishLoad:(UIWebView *)aWebView {
CGRect frame = aWebView.frame;
frame.size.height = 1;
aWebView.frame = frame;
CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];
frame.size = fittingSize;
aWebView.frame = frame;
scrollView.contentSize = CGSizeMake(SCREEN_WIDTH, fittingSize.height);
NSLog(@"====finish load %@:", [NSDate date]);
}
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = [request URL];
if ([[url scheme] isEqualToString:@"redirect"] &&
[[url host] isEqualToString:@"opp_detail"]) {
NSString *oppIdStr = [[url path] stringByReplacingOccurrencesOfString:@"/player_id=" withString:@""];
if (oppIdStr && [oppIdStr length]) {
NSNumber *oppId = [NSNumber numberWithInt:[oppIdStr intValue]];
if ([oppId intValue] != gcontext.me.id) {
[screenNav gotoOppDetailScreen:[oppId intValue]];
}
}
}
return YES;
}
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = [request URL];
if ([[url scheme] isEqualToString:@"redirect"] &&
[[url host] isEqualToString:@"opp_detail"]) {
NSString *oppIdStr = [[url path] stringByReplacingOccurrencesOfString:@"/player_id=" withString:@""];
if (oppIdStr && [oppIdStr length]) {
NSNumber *oppId = [NSNumber numberWithInt:[oppIdStr intValue]];
if ([oppId intValue] != gcontext.me.id) {
[screenNav gotoOppDetailScreen:[oppId intValue]];
}
}
}
return YES;
}
- (void)webViewDidStartLoad:(UIWebView *)webView{
NSLog(@"====start load %@:", [NSDate date]);
}
请帮帮我,为什么使用 UIWebView
的 loadHTMLString
时,它这么慢?
Please give me a hand, why it is so slow when loadHTMLString
with UIWebView
?
如果没有什么要渲染的内容,则可能是由于慢速磁盘操作(当您读取html字符串时所执行的操作)所致.
If there is nothing heavy to render, then it's possible that all about slow disk operations, that are performing when you're reading your html string.