UIWebView的偏移設置問題

Question

我使用一個UIWebView（裝有一個HTML文件），我想偏移的滾動位置和偏移量應保持不變，如果我改變文字size.I要存儲先前滾動位置，即使如果我更改文字大小。這個怎麼做？？？？

Answer 1

我總滾動高度另一種方法，我發現在http://www.alexnking.com/2008/10/14/going-back-to-the-last-place-you-were-in-a-uiwebview/，當你想SC可能有很大的幫助手動滾動UIWebView。

要獲取當前的滾動位置（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; 

    } 

} 

希望它可以幫助！

Answer 2

獲取當前偏移使用：

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

對於設置頁面偏移使用：

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

Answer 3

用於獲取頁面

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