从 InAppBrowser 旋转 PDF

Posted 2023-03-15

【中文标题】从 InAppBrowser 旋转 PDF

【英文标题】：Rotate a PDF from InAppBrowser

【发布时间】：2013-08-26 18:11:58

【问题描述】：

所以我能够集成InAppBrowser-CE 这个插件，它可以从指定的窗口大小显示 PDF 并提供透明度，但现在我想弄清楚如何旋转 PDF。我想添加一个旋转工具（类似于 ios 中的照片库），但不知道从哪里开始。我看到了一些关于图像旋转工具的东西，但不确定它是否适用于 pdf 文件，并且我不想保留一些不起作用的东西（即使用 iFrame 而不是 InAppBrowser 来显示 PDF）任何帮助非常感谢.这里只是一个如何调用 PDF 的示例，以便为您提供一些见解。

这是从html中调用它打开的：

 <button onclick="window.open('http://www.free.woodworking-plans.org/images/ranch-house-7161/ranch-house-floor-plan-o.jpg','_blank','vw=685,vh=650,vx=40,vy=40');">Change my size</button>

这是打开 PDF 的方式（来自 xcode CDVInAppBrowser.m）

- (void)openInInAppBrowser:(NSURL*)url withOptions:(NSString*)options


    if (self.inAppBrowserViewController == nil) 
        NSString* originalUA = [CDVUserAgentUtil originalUserAgent];
        self.inAppBrowserViewController = [[CDVInAppBrowserViewController alloc] initWithUserAgent:originalUA prevUserAgent:[self.commandDelegate userAgent]];
        self.inAppBrowserViewController.navigationDelegate = self;

        if ([self.viewController conformsToProtocol:@protocol(CDVScreenOrientationDelegate)]) 
            self.inAppBrowserViewController.orientationDelegate = (UIViewController <CDVScreenOrientationDelegate>*)self.viewController;
        
    

    // set pointer to this viewcontroller for later use
    iabvc = self.inAppBrowserViewController;

    CDVInAppBrowserOptions* browserOptions = [CDVInAppBrowserOptions parseOptions:options];
    [self.inAppBrowserViewController showLocationBar:browserOptions.location];
    [self.inAppBrowserViewController showToolBar:browserOptions.toolbar];

....

- (id)initWithUserAgent:(NSString*)userAgent prevUserAgent:(NSString*)prevUserAgent

    self = [super init];

    if (self != nil) 
        _userAgent = userAgent;
        _prevUserAgent = prevUserAgent;
        _webViewDelegate = [[CDVWebViewDelegate alloc] initWithDelegate:self];

        [self createViews];
    

    return self;

这里是工具部分的样子，

self.toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0, (self.view.bounds.size.height - TOOLBAR_HEIGHT), self.view.bounds.size.width, TOOLBAR_HEIGHT)];
    self.toolbar.alpha = 1.000;
    self.toolbar.autoresizesSubviews = YES;
    self.toolbar.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
    self.toolbar.barStyle = UIBarStyleBlackOpaque;
    self.toolbar.clearsContextBeforeDrawing = NO;
    self.toolbar.clipsToBounds = NO;
    self.toolbar.contentMode = UIViewContentModeScaleToFill;
    self.toolbar.contentStretch = CGRectFromString(@"0, 0, 1, 1");
    self.toolbar.hidden = NO;
    self.toolbar.multipleTouchEnabled = NO;
    self.toolbar.opaque = NO;
    self.toolbar.userInteractionEnabled = YES;

【参考方案1】：

我创建了一个旋转按钮，然后在下面添加了这个，

.h

  //header - add 'int counter'
@interface CDVInAppBrowserViewController : UIViewController <UIWebViewDelegate>
@private
    NSString* _userAgent;
    NSString* _prevUserAgent;
    NSInteger _userAgentLockToken;
    CDVWebViewDelegate* _webViewDelegate;
    int counter;

.m

//Add this to the top of the .m file
#define DegreesToRadians(X) ((X) * M_PI / 180.0)

...

 //reference
- (id)initWithUserAgent:(NSString*)userAgent prevUserAgent:(NSString*)prevUserAgent

    counter = 0;

...

//create Rotate Button
NSString* rotateString = @"Rotate";
self.RotateButton = [[UIBarButtonItem alloc] initWithTitle:rotateString style:UIBarButtonItemStylePlain target:self action:@selector(goRotate:)];
self.RotateButton.enabled = YES;
self.RotateButton.imageInsets = UIEdgeInsetsZero;

....

//action - sender
-(IBAction)goRotate:(id)sender
           counter ++;  float angle = (counter%3)*90;
            [UIView beginAnimations:@"rotate" context:nil];
            [UIView setAnimationDuration:0.5];
            self.webView.transform = CGAffineTransformMakeRotation(DegreesToRadians(angle));
            [UIView commitAnimations];