UIWebView加载本地文件时的重复

[带颜值的程序员]

项目中用到了本地的HTML，当webView去加载的时候去替换里面的网址，但是当我退出后重新加载另一个网页时，webview显示的是上一个网页，这是什么情况啊？很郁闷但是当我杀掉程序后就正常了，清除缓存也写了。。。
#pragma mark 清除webview的缓存----
- (void)deleteCache{
NSHTTPCookie *cookie;
NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (cookie in [storage cookies]) {
[storage deleteCookie:cookie];
}
[[NSURLCache sharedURLCache] removeAllCachedResponses];
NSURLCache *cache = [NSURLCache sharedURLCache];
[cache removeAllCachedResponses];
[cache setDiskCapacity:0];
[cache setMemoryCapacity:0];
}