Comment activer dans ScrollView Zooming (iPhone)

Question

i ont un code que je veux modifier pour obtenir une capacité de zoom. Maintenant, mon application ne faire un défilement horizontal mais pas un zoom.

me manque quelque chose, parce que j'ai essayé le « viewForZoomingInScrollView: » sans succès. Comment puis-je obtenir un zoom dans ce domaine?

Merci

#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

et la mise en œuvre:

#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

Answer 1

et où est votre implémentation de viewForZoomingInScrollView? qu'est-ce que ce retour?

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    return yourViewToBeZoomed; // 
}

EDIT:

ok, donc, en général, avec cette méthode, vous spécifiez simplement ce que vous devez faire défiler quand déplacer annonce l'utilisation de l'utilisateur 2 doigts sur votre ScrollView ... normalement (mais pas toujours), il est le premier sous-vue du UIScrollView lui-même .. .

, si c'est votre cas, essayez ce code:

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    return [scrollView2.subviews objectAtIndex:0];
}

et si vous avez ajouté plus et que vous voulez sous-vue les zoomer trop u'd mieux de les ajouter directement à votre UIScrollView mais à votre première sous-vue, ils zooment avec elle ...

ciao,

luca

Answer 2

Avez-vous mis maximumZoomScale? Que ce soit en code, ou IB ...

Answer 3

Cela a fonctionné, l'exemple Photoscroller d'Apple, il a utilisé aussi Carreleurs mais vous pouvez désactiver cette (competely ou tout simplement désactiver les lignes blanches). Elle soutient également la rotation.

est ici où l'on peut utiliser des images normales au lieu de tuiles:

- (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]];
}

Et si vous voulez utiliser Carreleurs (pour les grandes images), mais ne veulent pas voir les lignes blanches est le code ici (dans le ImageScrollView):

- (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;
}