iOS5的webView已经有磁盘缓存了

iOS5的webView磁盘缓存默认是20M,可以进行修改.或者覆盖缓存策略. NSURLCache* testCache = [[NSURLCache alloc]initWithMemoryCapacity:1024*1024*20 diskCapacity:1024*1024*50 diskPath:@"mead.db"];
    [NSURLCache setSharedURLCache:testCache];

    unsigned int diskCapacity = testCache.diskCapacity;
    NSLog（@"my diskCapacity=%d",diskCapacity）;

    [testCache setDiskCapacity:1024*1024*50];
    diskCapacity = testCache.diskCapacity;
    NSLog（@"after setting diskCapacity=%d",diskCapacity）;

    diskCapacity = testCache.currentDiskUsage;
    NSLog（@" currentDiskUsage=%d",diskCapacity）;

    diskCapacity = testCache.currentMemoryUsage;
    NSLog（@" currentMemoryUsage=%d",diskCapacity）;