UIImageView和UIScrollView縮放

我是否真的需要在UIScrollView中使用UIPinchGestureRecognizer來進行縮放工作？如果是，我該怎麼做？我正在嘗試實現flipboard的功能，它基本放大圖像並放大後具有滾動功能。我該怎麼做？UIImageView和UIScrollView縮放

UPDATE：

下面是一些代碼，我有當我發展我的縮放PDF閱讀器在一個UIScrollView不叫滾動視圖代表

CGRect imgFrame; 
imgFrame.size.width = originalImageSize.width; 
imgFrame.size.height = originalImageSize.height; 
imgFrame.origin.x = imageOriginPoint.x; 
imgFrame.origin.y = imageOriginPoint.y; 

NSData *data = [request responseData]; 
UIImage * image = [UIImage imageWithData:data]; 
imageView = [[UIImageView alloc] initWithImage:image]; 
[imageView setUserInteractionEnabled:YES]; 
[imageView setBackgroundColor:[UIColor clearColor]]; 
[imageView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight]; 
[imageView setFrame:CGRectMake(0, 0, imgFrame.size.width, imgFrame.size.height)]; 

UIScrollView * imgScrollView = [[UIScrollView alloc] initWithFrame:imageView.frame]; 
imgScrollView.delegate = self; 
imgScrollView.showsVerticalScrollIndicator = NO; 
imgScrollView.showsHorizontalScrollIndicator = NO; 
[imgScrollView setScrollEnabled:YES]; 
[imgScrollView setClipsToBounds:YES]; 
[imgScrollView addSubview:imageView]; 
[imgScrollView setBackgroundColor:[UIColor blueColor]]; 
[imgScrollView setMaximumZoomScale:1.0];

來源

2012-01-17 adit

所有你需要做的就是添加UIImageView（或任何視圖要放大）裏面的UIScrollView。

將您的UIScrollView上的maximumZoomScale設置爲高於1.0f的任何值。

將自己設置爲UIScrollView的代表並在viewForZooming委派方法中返回UIImageView。

就是這樣。沒有捏手勢需要，沒有什麼。 UIScrollView爲您處理縮放縮放。

來源

2012-01-17 16:33:48

是的，我做了所有，但代表不是所謂 – adit 2012-01-17 16:46:42

啊！我沒有設置maxZoomScale，因此它不起作用！謝謝 – adit 2012-01-17 16:49:26

伊格納西奧請你可以告訴對imageView和scrollView的限制。我做了同樣的事情，但它不起作用。我的圖像視圖設置爲縱橫填充，寬度從圖像視圖框外，因此我需要增加圖像視圖框以及滾動視圖內容大小寬度。我的滾動視圖中只有一個圖像 – 2017-11-09 10:03:43

我發現，當在手機上運行它實際上已經實現了作爲手機一部分的縮放功能。但你可以看看這個，http://developer.apple.com/library/ios/#samplecode/ZoomingPDFViewer/Introduction/Intro.html這是一段試圖實現縮放功能的示例代碼，這是想讓我開始。

來源

2012-01-17 08:15:08 Popeye

其實我看了這一點，它說，我需要一個叫做viewForZoomingInScrollView代表，然而，這是從來沒有所謂的，雖然我已經設置委託自我 – adit 2012-01-17 08:15:48

像@Novarg hassaid它就會被UIScrollViewDelegate調用，所以在你的.h文件確保添加了 – Popeye 2012-01-17 10:42:48

我確實添加了它，它仍然不叫 – adit 2012-01-17 16:22:43

不久前，我做了一個自定義圖像查看器，沒有夾點識別器。只需在UIScrollView之上的UIImageView。在那裏你傳遞一個鏈接到圖像的字符串，它也有一個進度條。一旦該圖像完成加載，圖像就會顯示出來。下面的代碼：

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView 
{ 
    return self.theImageView; 
} 

- (CGRect)centeredFrameForScrollView:(UIScrollView *)scroll andUIView:(UIView *)rView { 
    CGSize boundsSize = scroll.bounds.size; 
    CGRect frameToCenter = rView.frame; 
    // center horizontally 
    if (frameToCenter.size.width < boundsSize.width) { 
    frameToCenter.origin.x = (boundsSize.width - frameToCenter.size.width)/2; 
    } 
    else { 
    frameToCenter.origin.x = 0; 
    } 
    // center vertically 
    if (frameToCenter.size.height < boundsSize.height) { 
    frameToCenter.origin.y = (boundsSize.height - frameToCenter.size.height)/2; 
    } 
    else { 
    frameToCenter.origin.y = 0; 
    } 
    return frameToCenter; 
} 

-(void)scrollViewDidZoom:(UIScrollView *)scrollView 
{ 
    self.theImageView.frame = [self centeredFrameForScrollView:self.theScrollView andUIView:self.theImageView];        
} 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 
    [self.resourceData setLength:0]; 
    self.filesize = [NSNumber numberWithLongLong:[response expectedContentLength]]; 
} 

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 
    [self.resourceData appendData:data]; 
    NSNumber *resourceLength = [NSNumber numberWithUnsignedInteger:[self.resourceData length]]; 
    self.progressBar.progress = [resourceLength floatValue]/[self.filesize floatValue]; 
} 

-(void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    self.theImage = [[UIImage alloc]initWithData:resourceData]; 
    self.theImageView.frame = CGRectMake(0, 0, self.theImage.size.width, self.theImage.size.height); 
    self.theImageView.image = self.theImage; 
    self.theScrollView.minimumZoomScale = self.theScrollView.frame.size.width/self.theImageView.frame.size.width; 
    self.theScrollView.maximumZoomScale = 2.0; 
    [self.theScrollView setZoomScale:self.theScrollView.minimumZoomScale]; 
    self.theScrollView.contentSize = self.theImageView.frame.size; 
    self.theLabel.hidden = YES; 
    self.progressBar.hidden = YES; 
} 

-(void)setImageInImageView 
{ 
    NSURLRequest *req = [[NSURLRequest alloc]initWithURL:[NSURL URLWithString:self.imageLink]]; 
    NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:req delegate:self]; 
    if (conn) 
    { 
    self.resourceData = [NSMutableData data]; 
    } 
    else 
    { 
    NSLog(@"Connection failed: IMageViewerViewController"); 
    } 
} 

-(void)loadView 
{ 
    self.filesize = [[NSNumber alloc]init]; 
    self.progressBar = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleBar]; 
    self.progressBar.frame = CGRectMake(20, 240, 280, 40); 
    [self.progressBar setProgress:0.0]; 
    self.theImageView = [[[UIImageView alloc]initWithFrame:[[UIScreen mainScreen]applicationFrame]]autorelease]; 
    self.theScrollView = [[[UIScrollView alloc]initWithFrame:[[UIScreen mainScreen]applicationFrame]]autorelease]; 
    self.theScrollView.delegate = self; 
    [self.theScrollView addSubview:self.theImageView]; 
    self.view = self.theScrollView; 
    self.theLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 200, 320, 40)]; 
    self.theLabel.font = [UIFont boldSystemFontOfSize:15.0f]; 
    self.theLabel.text = @"Please wait, file is being downloaded"; 
    self.theLabel.textAlignment = UITextAlignmentCenter; 
    self.theLabel.hidden = NO; 
    [self.view addSubview:self.progressBar]; 
    [self.view bringSubviewToFront:self.progressBar]; 
    [self.view addSubview:self.theLabel]; 
    [self.view bringSubviewToFront:self. theLabel]; 
    [self performSelectorOnMainThread:@selector(setImageInImageView) withObject:nil waitUntilDone:NO]; 
}

而頭文件：

@interface ImageViewerViewController : UIViewController<UIScrollViewDelegate, NSURLConnectionDelegate, NSURLConnectionDataDelegate> 

@property (nonatomic, retain) IBOutlet UIImageView *theImageView; 
@property (nonatomic, retain) IBOutlet UIScrollView *theScrollView; 
@property (nonatomic, retain) NSString *imageLink; 
@property (nonatomic, retain) UIImage *theImage; 
@property (nonatomic, retain) UILabel *theLabel; 
@property (nonatomic, retain) UIProgressView *progressBar; 
@property (nonatomic, retain) NSMutableData *resourceData; 
@property (nonatomic, retain) NSNumber *filesize; 
@end

希望它可以幫助

來源

2012-01-17 08:15:42 Novarg

你知道爲什麼viewForZoomingInScrollView永遠不會被調用嗎？ – adit 2012-01-17 08:21:54

@adit它被UIScrollViewDelegate調用我相信 – Novarg 2012-01-17 08:24:10

@adit是否有效？或者你還有其他問題嗎？ – Novarg 2012-01-17 08:57:49

我想這個答案可能是不必要的，但我也有類似的問題@adit和解決它在一個非常簡單的方法（我認爲），也許有人有類似的挑戰，可以使用它：

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    self.view.backgroundColor = [UIColor yellowColor]; 

    UIImage *imageToLoad = [UIImage imageNamed:@"background_green"]; 

    self.myImageView = [[UIImageView alloc]initWithImage:imageToLoad]; 
    self.myScrollView = [[UIScrollView alloc]initWithFrame:self.view.bounds]; 
    [self.myScrollView addSubview:self.myImageView]; 
    self.myScrollView.contentSize = self.myImageView.bounds.size; 
    self.myScrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite; 
    self.myScrollView.minimumZoomScale = 0.3f; 
    self.myScrollView.maximumZoomScale = 3.0f; 
    self.myScrollView.delegate = self; 
    [self.view addSubview:self.myScrollView]; 
} 

- (UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView { 
    NSLog(@"viewForZoomingInScrollView"); 
    return self.myImageView; 
}

我問題是一個非常簡單的我忘了添加self.myScrollView.delegate = self;，這是我有問題的原因。我花了永遠的數字，簡單的問題了，我想我沒有看到阿甘對所有的樹木:-)

來源

2013-08-03 21:06:55 PeterK

雨燕2.0 滾動型步驟捏縮放圖像（雨燕2.0）

1.滾動視圖約束

2。添加ImageView的滾動型，並設置約束

3.採取IBOutlets

IBOutlet UIScrollView * bgScrollView; 
IBOutlet UIImageView * imageViewOutlet;

4. viewDidLoad方法

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    float minScale=bgScrollView.frame.size.width/imageViewOutlet.frame.size.width; 
    bgScrollView.minimumZoomScale = minScale; 
    bgScrollView.maximumZoomScale = 3.0; 
    bgScrollView.contentSize = imageViewOutlet.frame.size; 
    bgScrollView.delegate = self; 
}

5.滾動查看委託方法

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

來源

2016-02-25 13:50:23

UIImageView和UIScrollView縮放

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