解决UIWebView内存占用过高

iOS8以上使用WKWebView。。需要支持iOS7,这就必须要UIWebview和WKWebview的混合使用，这里讲一下怎么解决UIWebView内存问题

首先你在APPDelagate,改变缓存策略,使他到达你设定的值后,进行强制内存回收,这样做还有一个好处就是提高网页加载速度

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

int cacheSizeMemory = 4*1024*1024; // 4MB

int cacheSizeDisk = 32*1024*1024; // 32MB

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:cacheSizeMemory diskCapacity:cacheSizeDisk diskPath:@"nsurlcache"];

[NSURLCache setSharedURLCache:sharedCache];

}

- (void)webViewDidFinishLoad:(UIWebView *)webView {

[[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"WebKitCacheModelPreferenceKey"];

[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"WebKitDiskImageCacheEnabled"];

[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"WebKitOfflineWebApplicationCacheEnabled"];

[[NSUserDefaults standardUserDefaults] synchronize];

}

然后在页面消失的时候,强制把webview的delegate设置为nil，并清除缓存

-(void)dealloc {

self.webView.delegate = nil;

[[NSURLCache sharedURLCache] removeAllCachedResponses];

}