UIWebView的偏移设置问题

Question

我使用一个UIWebView（装有一个HTML文件），我想偏移的滚动位置和偏移量应保持不变，如果我改变文字size.I要存储先前滚动位置，即使如果我更改文字大小。这个怎么做？？？？

Answer 1

我总滚动高度另一种方法，我发现在http://www.alexnking.com/2008/10/14/going-back-to-the-last-place-you-were-in-a-uiwebview/，当你想SC可能有很大的帮助手动滚动UIWebView。

要获取当前的滚动位置（垂直）：

[myWebView stringByEvaluatingJavaScriptFromString: @"scrollY"]; 

// Application is terminating. 

- (void)applicationWillTerminate:(UIApplication *)application { 

    [[NSUserDefaults standardUserDefaults] setInteger: 
    [[myWebView stringByEvaluatingJavaScriptFromString: @"scrollY"] 
     intValue] forKey: @"currentScroll"]; 
} 

// Application is loading. 

- (void)applicationDidFinishLaunching:(UIApplication *)application { 

initialScrollPosition = [[NSUserDefaults standardUserDefaults] 
           integerForKey: @"currentScroll"]; 
} 

// WebView is finished loading 

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

    // Check if we need to scroll this somewhere. 

    if (initialScrollPosition != 0) { 

    // Scroll to the position. 

    [passageView stringByEvaluatingJavaScriptFromString: 
     [NSString stringWithFormat: @"window.scrollTo(0, %d);", 
     self.initialScrollPosition]]; 

    // Set the initial scroll value to zero so we don't try 

    // to scroll to it again if the user navigates to another page. 

    self.initialScrollPosition = 0; 

    } 

} 

希望它可以帮助！

Answer 2

获取当前偏移使用：

int pageYOffset = [[webView stringByEvaluatingJavaScriptFromString:@"window.pageYOffset"] intValue]; 

对于设置页面偏移使用：

[webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"document.body.scrollTop = %d", 100]]; 

Answer 3

用于获取页面

int scrollHeight = [[webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.scrollHeight"] intValue];