About UIWebView loading a Web PDF to achieve page turn effects

Well, first of all, the PDF that loads the network is not local.

Creating a new view is primarily used for looping the rendering of a single page of PDF content

The. h override Init method is used to customize the receive Docref file and incoming page pages

-(Instancetype) initWithFrame: (CGRect) frame documentref: (cgpdfdocumentref) docref andpagenum: (int) page;

. m page implementation method and requires attribute method

Cgpdfdocumentref Documentref; This is the doc file type that the PDF receives

Nsinteger Pagenum; Receives the current page

-(Instancetype) initWithFrame: (CGRect) frame documentref: (cgpdfdocumentref) docref andpagenum: (int) page{

self = [super Initwithframe:frame];

if (self) {

Documentref= Docref;

_pagenum= page;

self.backgroundcolor= [Uicolor Whitecolor];

}

return self;

}

And then, because it's a circular render draw, you need to override DrawRect Override this method to perform a redraw task

The DrawRect call is called after the Controller->loadview,,controller->viewdidload two method.

-(void) DrawRect: (cgrect) Rect {

[Self Drawpdfincontext:uigraphicsgetcurrentcontext ()];//passing the current context environment new method

}

Okay, the most important part is coming.

-(void) Drawpdfincontext: (cgcontextref) Context {

Adjust the position of a graphic

//Quartz坐标系和UIView坐标系不一样所致，调整坐标系，使pdf正立

CGCONTEXTTRANSLATECTM (Context,0.0,self.frame.size.height);

The graphic is displayed in a positive state

CGCONTEXTSCALECTM (context,1.0,-1.0);

/获取指定页的pdf文档

Cgpdfpageref pageRef =cgpdfdocumentgetpage (documentref,_pagenum);

Document the current drawing environment to prevent multiple painting

Cgcontextsavegstate (context);

//创建一个仿射变换，该变换基于将PDF页的BOX映射到指定的矩形中。

Cgaffinetransform pdftransform =cgpdfpagegetdrawingtransform (pageref,kcgpdfcropbox,self.bounds,0,true);

CGCONTEXTCONCATCTM (context, pdftransform);

//将pdf绘制到上下文中

Cgcontextdrawpdfpage (context, PAGEREF);

//将pdf保存

Cgcontextrestoregstate (context);

}

Okay, here's how to customize the view implementation. Then go back to the VC page

Mainly in the viewdidload inside. M

I'm going to start here.

Flip page We can think of a lot of things like Uipageviewcontroller Uicollectionview and so here I'm mainly talking about Uipageviewcontroller

@property (Nonatomic,strong) Uipageviewcontroller *PAGEVC;

@property (Nonatomic,strong) Nsmutablearray *pdfarr;

You all know that?

Self.pdfarr = [Nsmutablearray array];

Nsdictionary *options = [nsdictionary dictionarywithobject:[nsnumber numberwithinteger: Uipageviewcontrollerspinelocationmin] Forkey:uipageviewcontrolleroptionspinelocationkey];

SELF.PAGEVC = [[Uipageviewcontroller alloc]initwithtransitionstyle:uipageviewcontrollertransitionstylepagecurl Navigationorientation:uipageviewcontrollernavigationorientationhorizontal Options:options];

_pagevc.view.frame = Self.view.bounds;

_pagevc.delegate = self;

_pagevc.datasource = self;

[Self ADDCHILDVIEWCONTROLLER:_PAGEVC];

Cgpdfdocumentref pdfref = [self pdfrefbydatabyurl:@ "http://eb18036.ebenny.com/new_huasun_server/upload//pdf// 1527047215118.pdf "];

size_t count = cgpdfdocumentgetnumberofpages (PDFREF);//This position is mainly to get the number of PDF pages;

for (int i = 0; i < count; i++) {

Uiviewcontroller *PDFVC = [[Uiviewcontroller alloc] init];

Llpdfview *pdfview = [[Llpdfview alloc]initwithframe:self.view.bounds documentref:pdfref andPageNum:i+1];

[Pdfvc.view Addsubview:pdfview];

[_pdfarr ADDOBJECT:PDFVC];

}

[_pagevc Setviewcontrollers:[nsarray Arraywithobject:_pdfarr[0]] direction: Uipageviewcontrollernavigationdirectionforward Animated:yes Completion:nil];

[Self.view Addsubview:_pagevc.view];

-(Cgpdfdocumentref) Pdfrefbydatabyurl: (NSString *) Afileurl {

Nsurl*url = [Nsurl Urlwithstring:afileurl];

Cfurlref Refurl = (__bridge_retained cfurlref) URL;

Cgpdfdocumentref document =cgpdfdocumentcreatewithurl (Refurl);

if (Refurl) {

Cfrelease (Refurl);

}

if (document) {

Return document;//returns the data obtained

}else{

return NULL; If you do not get the data, then return null, of course, you can add some print logs here, so you find the problem

}

}

-(Uiviewcontroller *) Viewcontrolleratindex: (nsinteger) index

{

Create a new view controller and pass suitable data.

if (([_pdfarr count] = = 0) | | (Index > [_pdfarr Count])) {

return nil;

}

NSLog (@ "index =%ld", (long) index);

Return (Uiviewcontroller *) _pdfarr[index];

}

-(Nsuinteger) Indexofviewcontroller: (Uiviewcontroller *) Viewcontroller

{

return [Self.pdfarr Indexofobject:viewcontroller];

}

-(Uiviewcontroller *) Pageviewcontroller: (Uipageviewcontroller *) Pageviewcontroller Viewcontrollerafterviewcontroller: (Uiviewcontroller *) Viewcontroller

{

Nsuinteger index = [self Indexofviewcontroller: (Uiviewcontroller *) Viewcontroller];

if (index = = nsnotfound) {

return nil;

}

index++;

if (index = = [_pdfarr count]) {

return nil;

}

return [self viewcontrolleratindex:index];

}

-(Uiviewcontroller *) Pageviewcontroller: (Uipageviewcontroller *) Pageviewcontroller Viewcontrollerbeforeviewcontroller: (Uiviewcontroller *) Viewcontroller

{

Nsuinteger index = [self Indexofviewcontroller: (Uiviewcontroller *) Viewcontroller];

if (index = = 0) | | (index = = nsnotfound)) {

return nil;

}

index--;

return [self viewcontrolleratindex:index];

}

About UIWebView loading a Web PDF to achieve page turn effects