在UIWebView上启用缩放/缩放

Question

我有一个带有pdf文件的UIWebView.它工作正常.但是如何启用缩放pdf文件呢？

Answer 1

确保选中"Scales page to fit"

Answer 2

你可以以webView.scalesPageToFit=YES;编程方式使用

如果你在xib中使用而不仅仅是 click the check box "Scaling" scales Page to fit

Answer 3

这个逻辑用于缩放UIWebView,无需在UIScrollView上添加UIWebView

唯一的问题webView.scalesPageToFit = YES;是,它会改变字体大小的初始内容,但我找到了其他选项

添加<UIWebViewDelegate, UIScrollViewDelegate>到您的.h文件

创造你的 UIWebView.

self.mWebview = [[UIWebView alloc] init];
self.mWebview.delegate = self; /// set delegate method of UIWebView
self.mWebview.frame = CGRectMake(0, 35, self.view.bounds.size.width, self.view.bounds.size.height - 80); // set frame whatever you want..
[self.mWebview setOpaque:NO];
self.mWebview.backgroundColor = [UIColor clearColor];
[self.view addSubview:self.mWebview];

加载HTML文件/内容.

NSString* htmlString = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"File Name"ofType:@"html"] encoding:NSUTF8StringEncoding error:nil];
[self.mWebview loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];


#pragma mark -
#pragma mark - Webview Delegate Methods

- (void) webViewDidFinishLoad:(UIWebView *)webView
{
    webView.scrollView.delegate = self; // set delegate method of UISrollView
    webView.scrollView.maximumZoomScale = 20; // set as you want.
    webView.scrollView.minimumZoomScale = 1; // set as you want.

    //// Below two line is for iOS 6, If your app only supported iOS 7 then no need to write this.
    webView.scrollView.zoomScale = 2;
    webView.scrollView.zoomScale = 1;
}

#pragma mark -
#pragma mark - UIScrollView Delegate Methods

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
    self.mWebview.scrollView.maximumZoomScale = 20; // set similar to previous.
}

注意:我必须使用Xcode 5.1.1和iOS 6.1及更高版本在Mac OS X - 10.9.3上进行测试.

我希望这对你有所帮助.:)

Answer 4

我知道这个问题已经很老了,但对于每个使用故事板的人而言,更喜欢这里的视觉答案.只需在WebView的Attributes Inspector中选中此框:

Answer 5

如果你想通过编程方式做,那么使用

webView.scalesPageToFit = true; 

如果您正在使用故事板,则必须勾选"缩放"复选框以缩放页面以适合

Answer 6

你必须设置scalesPageToFit = YES,以便在UIWebView上进行任何捏合和缩放.它对我有用.