我有一个代码，我想修改以获得缩放功能。现在我的应用程序只进行水平滚动而不是缩放。
我想念一些东西，因为我试过＆＃34; viewForZoomingInScrollView：＆＃34;没有成功。 我怎样才能放大这个？
由于
#import <UIKit/UIKit.h>
@interface IntroductionViewController : UIViewController <UIScrollViewDelegate>{
IBOutlet UIScrollView *scrollView;
CGRect rectScrollView;
int scrollWidth;
int scrollHeight;
NSArray *contentArray;
UIColor *bcgColor;
BOOL rememberPosition;
NSString *positionIdentifier;
}
@property (nonatomic, retain) IBOutlet UIScrollView *scrollView;
/// returns width of the scollview
- (int)getScrollViewWidth;
/// set width and height for your final UIScrollView
- (void)setWidth:(int)width andHeight:(int)height;
/// set the exactly same size as it is your parent view
- (void)setSizeFromParentView:(UIScrollView *)scView;
/// set background color for your UIScrollView
- (void)setBackGroudColor:(UIColor *)color;
/// set an array with images you want to display in your new scroll view
- (void)setContentArray:(NSArray *)images;
/// enable position history
- (void)enablePositionMemory;
/// enable position history with custom memory identifier
- (void)enablePositionMemoryWithIdentifier:(NSString *)identifier;
/// returns your UIScrollView with predefined page
- (UIScrollView *)getWithPosition:(int)page;
/// returns your UIScrollView with enabled position history
- (UIScrollView *)getWithPositionMemory;
/// returns your UIScrollView with enabled position history with custom memory identifier
- (UIScrollView *)getWithPositionMemoryIdentifier:(NSString *)identifier;
/// returns your UIScrollView
- (UIScrollView *)get;
@end
和实施：
#import "IntroductionViewController.h"
#define kIGUIScrollViewImagePageIdentifier @"kIGUIScrollViewImagePageIdentifier"
#define kIGUIScrollViewImageDefaultPageIdentifier @"Default"
@implementation IntroductionViewController
@synthesize scrollView;
- (int)getScrollViewWidth {
return ([contentArray count] * scrollWidth);
}
- (void)setWidth:(int)width andHeight:(int)height {
scrollWidth = width;
scrollHeight = height;
if (!width || !height) rectScrollView = [[UIScreen mainScreen] applicationFrame];
else rectScrollView = CGRectMake(0, 0, width, height);
}
- (void)setSizeFromParentView:(UIScrollView *)scView {
scrollWidth = scView.frame.size.width;
scrollHeight = scView.frame.size.height;
rectScrollView = CGRectMake(0, 0, scrollWidth, scrollHeight);
}
- (void)setContentArray:(NSArray *)images {
contentArray = images;
}
- (void)setBackGroudColor:(UIColor *)color {
bcgColor = color;
}
- (void)enablePositionMemoryWithIdentifier:(NSString *)identifier {
rememberPosition = NO;
if (!identifier) identifier = kIGUIScrollViewImageDefaultPageIdentifier;
positionIdentifier = identifier;
}
- (void)enablePositionMemory {
[self enablePositionMemoryWithIdentifier:nil];
}
- (UIScrollView *)getWithPosition:(int)page {
if (!contentArray) {
contentArray = [[[NSArray alloc] init] autorelease];
}
if (page > [contentArray count]) page = 0;
if (!scrollWidth || !scrollHeight) {
rectScrollView = [[UIScreen mainScreen] applicationFrame];
scrollWidth = rectScrollView.size.width;
scrollHeight = rectScrollView.size.height;
}
rectScrollView = CGRectMake(0, 0, scrollWidth, scrollHeight);
self.scrollView = [[UIScrollView alloc] initWithFrame:rectScrollView];
self.scrollView.contentSize = CGSizeMake([self getScrollViewWidth], scrollHeight);
if (!bcgColor) bcgColor = [UIColor blackColor];
self.scrollView.backgroundColor = bcgColor;
self.scrollView.alwaysBounceHorizontal = YES;
self.scrollView.contentOffset = CGPointMake(page * scrollWidth, 0);
self.scrollView.pagingEnabled = YES;
UIView *main = [[[UIView alloc] initWithFrame:rectScrollView] autorelease];
int i = 0;
for (UIImage *img in contentArray) {
UIImageView *imageView = [[UIImageView alloc] init];
imageView.image = img;
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
imageView.backgroundColor = [UIColor blackColor];
float ratio = img.size.width/rectScrollView.size.width;
CGRect imageFrame = CGRectMake(i, 0, rectScrollView.size.width, (img.size.height / ratio));
imageView.frame = imageFrame;
[self.scrollView addSubview:(UIView *)imageView];
i += scrollWidth;
[imageView release];
}
[main addSubview:scrollView];
//if (margin) [margin release];
[self.scrollView release];
[self.scrollView release];
return (UIScrollView *)main;
}
- (UIScrollView *)get {
return [self getWithPosition:0];
}
- (UIScrollView *)getWithPositionMemory {
[self enablePositionMemory];
return [self getWithPosition:[[[NSUserDefaults standardUserDefaults] objectForKey:[NSString stringWithFormat:@"%@%@", kIGUIScrollViewImagePageIdentifier, kIGUIScrollViewImageDefaultPageIdentifier]] intValue]];
}
- (UIScrollView *)getWithPositionMemoryIdentifier:(NSString *)identifier {
[self enablePositionMemoryWithIdentifier:identifier];
return [self getWithPosition:[[[NSUserDefaults standardUserDefaults] objectForKey:[NSString stringWithFormat:@"%@%@", kIGUIScrollViewImagePageIdentifier, positionIdentifier]] intValue]];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)sv {
int page = sv.contentOffset.x / sv.frame.size.width;
if (rememberPosition) {
[[NSUserDefaults standardUserDefaults] setObject:[NSString stringWithFormat:@"%d", page] forKey:[NSString stringWithFormat:@"%@%@", kIGUIScrollViewImagePageIdentifier, positionIdentifier]];
[[NSUserDefaults standardUserDefaults] synchronize];
}
}
- (NSArray *)getImages {
NSMutableArray *arr = [[[NSMutableArray alloc] init] autorelease];
// codice per intercettare la lingua impostata dall utente
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSArray *languages = [defaults objectForKey:@"AppleLanguages"];
NSString *currentLanguage = [languages objectAtIndex:0];
NSLog(@"Codice lingua %@", currentLanguage);
if( [currentLanguage isEqualToString:@"es"] ){
[arr addObject:[UIImage imageNamed:@"image1-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image2-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image3-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image4-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image5-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image6-intro.jpg"]];
return (NSArray *)arr;
}
else {
[arr addObject:[UIImage imageNamed:@"image1-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image2-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image3-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image4-intro.jpg"]];
[arr addObject:[UIImage imageNamed:@"image5-intro.jpg"]];
return (NSArray *)arr;
}
}
/*
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
//codice per mettere il titolo come immagine
UIImage *titolo = [UIImage imageNamed: @"introTitle.png"];
UIImageView *titoloView = [[UIImageView alloc] initWithImage: titolo];
self.navigationItem.titleView = titoloView;
IntroductionViewController *svimage = [[IntroductionViewController alloc] init];
[svimage setContentArray:[self getImages]];
[svimage setSizeFromParentView:scrollView];
[self.view addSubview:[svimage getWithPosition:0]];
[svimage release];
[titoloView release];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
NSLog(@"memoria view");
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
答案 0 :(得分：2)
你的viewForZoomingInScrollView的实现在哪里？ 它返回了什么？
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return yourViewToBeZoomed; //
}
修改
好吧，所以，通常情况下，使用此方法，您只需指定当您在scrollView上使用ad move 2 finger时必须滚动的内容...通常（但不总是）它是UIScrollView本身的第一个子视图。
所以，如果是你的情况，试试这个代码：
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return [scrollView2.subviews objectAtIndex:0];
}
如果你添加了更多的subView并想要缩放它们，你最好不要将它们直接添加到你的UIScrollView，而是添加到你的第一个subView，这样它们就可以用它来缩放......
ciao，
卢卡
答案 1 :(得分：0)
您是否设置了maximumZoomScale？无论是在代码中还是在IB中......
答案 2 :(得分：0)
这很有效，Photocroller Apple的例子，它也使用Tiling但你可以禁用它（相当或只是禁用白线）。它也支持轮换。
这里是你可以使用普通图像而不是平铺图像的地方：
- (void)configurePage:(ImageScrollView *)page forIndex:(NSUInteger)index
{
page.index = index;
page.frame = [self frameForPageAtIndex:index];
// Use tiled images
/*
[page displayTiledImageNamed:[self imageNameAtIndex:index]
size:[self imageSizeAtIndex:index]];
*/
// To use full images instead of tiled images, replace the "displayTiledImageNamed:" call
// above by the following line:
[page displayImage:[self imageAtIndex:index]];
}
如果你想使用Tiling（对于大图片）但不想看到这里的白线是代码（在ImageScrollView中）：
- (void)displayTiledImageNamed:(NSString *)imageName size:(CGSize)imageSize
{
// clear the previous imageView
[imageView removeFromSuperview];
[imageView release];
imageView = nil;
// reset our zoomScale to 1.0 before doing any further calculations
self.zoomScale = 1.0;
// make a new TilingView for the new image
imageView = [[TilingView alloc] initWithImageName:imageName size:imageSize];
/*
[(TilingView *)imageView setAnnotates:YES]; // ** remove this line to remove the white tile grid **
*/
[self addSubview:imageView];
self.contentSize = imageSize;
[self setMaxMinZoomScalesForCurrentBounds];
self.zoomScale = self.minimumZoomScale;
}