您好我想创建一个应用程序，我必须在iphone屏幕上显示pdffile，它具有缩放功能。我有多页pdffile，但问题是我只能显示一页。 这是代码：
/*myView.m*/
@implementation MyView
- (void)configureTiledLayer {
if([global getfirsttime] == 0)
{
[global fetchpageCtr : 1];
[global fetchfirsttime:1];
}
zoom = 1.0f;
tiledLayer = [CATiledLayer layer];
TiledDelegate *delegate = [[TiledDelegate alloc] init];
tiledLayer.delegate = delegate;
// get tiledLayer size
CGRect pageRect = CGPDFPageGetBoxRect(delegate.map, kCGPDFCropBox);
int w = pageRect.size.width;
int h = pageRect.size.height;
NSLog(@"height==%d,weight=%d",h,w);
// get level count
int levels = 1;
while (w > 1 && h > 1) {
levels++;
w = w >> 1;
h = h >> 1;
}
NSLog(@"Layer create");
// set the levels of detail
tiledLayer.levelsOfDetail = levels;
// set the bias for how many 'zoom in' levels there are
tiledLayer.levelsOfDetailBias = 5;
// setup the size and position of the tiled layer
CGFloat width = CGRectGetWidth(pageRect);
CGFloat height = CGRectGetHeight(pageRect);
tiledLayer.bounds = CGRectMake(0.0f, 0.0f, width, height);
CGFloat x = width * tiledLayer.anchorPoint.x;
CGFloat y = -height * tiledLayer.anchorPoint.y;
tiledLayer.position = CGPointMake(x * zoom, y * zoom);
tiledLayer.transform = CATransform3DMakeScale(zoom, zoom, 1.0f);
// transform the super layer so things draw 'right side up'
CATransform3D superTransform = CATransform3DMakeTranslation(0.0f, self.bounds.size.height, 0.0f);
self.layer.transform = CATransform3DScale(superTransform, 1.0, -1.0f, 1.0f);
[self.layer addSublayer:tiledLayer];
[tiledLayer setNeedsDisplay];
moving = NO;
NSLog(@"in layer");
}
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.backgroundColor = [UIColor blueColor];
[self configureTiledLayer];
}
return self;
}
- (id)initWithCoder:(NSCoder *)coder {
if (self = [super initWithCoder:coder]) {
[self configureTiledLayer];
}
return self;
}
- (void)setZoom:(CGFloat)newZoom {
zoom = newZoom;
tiledLayer.transform = CATransform3DMakeScale(zoom, zoom, 1.0f);
}
- (void)zoomIn {
[self setZoom:zoom * 2.0f];
}
- (void)zoomOut {
[self setZoom:zoom * 0.5f];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if(touches.count == 1) {
previousPoint = [[touches anyObject] locationInView:self];
} else if(touches.count == 2) {
// pinch zoom
pinchZoom = YES;
NSArray *touches = [event.allTouches allObjects];
CGPoint pointOne = [[touches objectAtIndex:0] locationInView:self];
CGPoint pointTwo = [[touches objectAtIndex:1] locationInView:self];
previousDistance = sqrt(pow(pointOne.x - pointTwo.x, 2.0f) +
pow(pointOne.y - pointTwo.y, 2.0f));
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if(touches.count == 1) {
CGPoint currentPoint = [[touches anyObject] locationInView:self];
CGPoint delta = CGPointMake(currentPoint.x - previousPoint.x, currentPoint.y - previousPoint.y);
tiledLayer.position = CGPointMake(tiledLayer.position.x + delta.x * zoom,
tiledLayer.position.y + delta.y * zoom);
previousPoint = currentPoint;
moving = YES;
} else if(touches.count == 2) {
// pinch zoom stuff
NSArray *touches = [event.allTouches allObjects];
CGPoint pointOne = [[touches objectAtIndex:0] locationInView:self];
CGPoint pointTwo = [[touches objectAtIndex:1] locationInView:self];
CGFloat distance = sqrt(pow(pointOne.x - pointTwo.x, 2.0f) +
pow(pointOne.y - pointTwo.y, 2.0f));
CGFloat newZoom = fabs(zoom + (distance - previousDistance) / previousDistance);
[self setZoom:newZoom];
previousDistance = distance;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if(!moving) {
if(touches.count == 1) {
// realy should recenter on a click but I'm being lazy
if([[touches anyObject] tapCount] == 2) {
[NSObject cancelPreviousPerformRequestsWithTarget:self];
[self zoomOut];
} else {
[self performSelector:@selector(zoomIn) withObject:nil afterDelay:0.25];
}
}
} else {
moving = NO;
}
}
- (void)dealloc {
[tiledLayer release];
[super dealloc];
}
/*TiledDelegate.m*/
@implementation TiledDelegate
- (CGPDFDocumentRef)sfMuni {
if(NULL == sfMuni) {
NSString *path = [[NSBundle mainBundle] pathForResource:@"Hunting-TrappingSynopsis_0910" ofType:@"pdf"];
NSURL *docURL = [NSURL fileURLWithPath:path];
sfMuni = CGPDFDocumentCreateWithURL((CFURLRef)docURL);
}
return sfMuni;
}
- (CGPDFPageRef)map {
int temppageno = [global getpageCtr];
NSLog(@"page ctr ==%d ",temppageno);
if(NULL == map) {
map = CGPDFDocumentGetPage(self.sfMuni, temppageno);
}
return map;
}
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx {
NSLog(@"\ndrawLayer:inContext:");
NSLog(@"ctm = %@", NSStringFromCGAffineTransform(CGContextGetCTM(ctx)));
NSLog(@"box = %@\n", NSStringFromCGRect(CGContextGetClipBoundingBox(ctx)));
CGContextDrawPDFPage(ctx, self.map);
}
- (void)dealloc {
CGPDFPageRelease(map);
CGPDFDocumentRelease(sfMuni);
[super dealloc];
}
/*TiledLayerAppDelegate*/
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
/*TiledLayerViewController*/
- (void)viewDidLoad
{
l_pagectr = 2;
UIButton *btn1 = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
btn1.frame = CGRectMake(0,0,70,50);
[btn1 setBackgroundColor: [UIColor whiteColor]];
btn1.exclusiveTouch = YES;
[btn1 setTitle:@"Next" forState:UIControlStateNormal];
[btn1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn1 addTarget:self action:@selector(NextPressed:)
forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn1];
}
-(IBAction)NextPressed : (id)sender
{
[global fetchpageCtr : l_pagectr++];
MyView *myview1=[[MyView alloc]init];
}
@end
这里当我按下Next按钮时，它必须显示我的嵌套页面，但会显示同一页面。我也会在“CGPDFPageRef”中增加但不显示页面referance。
Plz帮助我。