UIScrollView在3倍變焦UIView覆蓋

Question

我有一個UIScrollView包含一個大的圖像大小爲3354 x 2082.我有UIScrollView縮小顯示整個圖像。我加入了紅色圓圈所示：

CGRect positionFrame = CGRectMake(500,500,5,5); 
RedCircle * circleView = [[RedCircle alloc] initWithFrame:positionFrame]; 
[self.scrollView addSubview:circleView]; 

問題 - 紅色圓圈不具有放大了同一位置（newZoomScale = 0.305307f）和全變焦（newZoomScale = 3.0F）。

這是比語法更合乎邏輯的問題。任何能幫助的天才？

編輯：發佈整個代碼：

@interface MainMap() 
@property (nonatomic, strong) UIImageView *imageView; 

- (void)centerScrollViewContents; 
- (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer; 
@end 

@implementation MainMap 
@synthesize scrollView = _scrollView; 
@synthesize imageView = _imageView; 


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ 
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
if (self) { 
    // Custom initialization 
} 
return self; 
} 

- (void)viewDidLoad{ 
[super viewDidLoad]; 

// Set up the image we want to scroll & zoom and add it to the scroll view 
UIImage *image = [UIImage imageNamed:@"worldMap.jpg"]; 
self.imageView = [[UIImageView alloc] initWithImage:image]; 
self.imageView.frame = (CGRect){.origin=CGPointMake(0.0f, 0.0f), .size=image.size}; 
[self.scrollView addSubview:self.imageView]; 

// Tell the scroll view the size of the contents 
self.scrollView.contentSize = image.size; 
//self.scrollView.scrollEnabled = NO; 

UITapGestureRecognizer *doubleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(scrollViewDoubleTapped:)]; 
doubleTapRecognizer.numberOfTapsRequired = 2; 
doubleTapRecognizer.numberOfTouchesRequired = 1; 
[self.scrollView addGestureRecognizer:doubleTapRecognizer]; 

UITapGestureRecognizer *twoFingerTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(scrollViewTwoFingerTapped:)]; 
twoFingerTapRecognizer.numberOfTapsRequired = 1; 
twoFingerTapRecognizer.numberOfTouchesRequired = 2; 
[self.scrollView addGestureRecognizer:twoFingerTapRecognizer]; 
} 

- (void)viewWillAppear:(BOOL)animated{ 
[super viewWillAppear:animated]; 

// Set up the minimum & maximum zoom scales 
CGRect scrollViewFrame = self.scrollView.frame; 
CGFloat scaleWidth = scrollViewFrame.size.width/self.scrollView.contentSize.width; 
CGFloat scaleHeight = scrollViewFrame.size.height/self.scrollView.contentSize.height; 
CGFloat minScale = MIN(scaleWidth, scaleHeight); 

self.scrollView.minimumZoomScale = minScale; 
self.scrollView.maximumZoomScale = 3.0f; 
self.scrollView.zoomScale = minScale; 

[self centerScrollViewContents]; 


CGRect positionFrame = CGRectMake(500,500,5,5); 
RedCircle * circleView = [[RedCircle alloc] initWithFrame:positionFrame]; 
[self.scrollView addSubview:circleView]; 
} 


- (void)centerScrollViewContents{ 
CGSize boundsSize = self.scrollView.bounds.size; 
CGRect contentsFrame = self.imageView.frame; 

if (contentsFrame.size.width < boundsSize.width) { 
    contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width)/2.0f; 
} else { 
    contentsFrame.origin.x = 0.0f; 
} 

if (contentsFrame.size.height < boundsSize.height) { 
    contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height)/2.0f; 
} else { 
    contentsFrame.origin.y = 0.0f; 
} 

self.imageView.frame = contentsFrame; 
} 

- (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer{ 
// Get the location within the image view where we tapped 
CGPoint pointInView = [recognizer locationInView:self.imageView]; 

// Get a zoom scale that's zoomed in slightly, capped at the maximum zoom scale specified by the scroll view 
CGFloat newZoomScale = 0.0f; 
if(self.scrollView.zoomScale == 3.0f) 
{ 
    newZoomScale = 0.305307f; 
} else 
{ 
    newZoomScale = 3.0f; 
} 

newZoomScale = MIN(newZoomScale, self.scrollView.maximumZoomScale); 

// Figure out the rect we want to zoom to, then zoom to it 
CGSize scrollViewSize = self.scrollView.bounds.size; 

CGFloat w = scrollViewSize.width/newZoomScale; 
CGFloat h = scrollViewSize.height/newZoomScale; 
CGFloat x = pointInView.x - (w/2.0f); 
CGFloat y = pointInView.y - (h/2.0f); 

CGRect rectToZoomTo = CGRectMake(x, y, w, h); 

[self.scrollView zoomToRect:rectToZoomTo animated:YES]; 


float scale = self.scrollView.zoomScale; 
CGRect positionFrame = CGRectMake(500 * scale, 500 * scale ,50,50); 
RedCircle * circleView = [[RedCircle alloc] initWithFrame:positionFrame]; 
[self.scrollView addSubview:circleView]; 
} 

- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView{ 
// Return the view that we want to zoom 
return self.imageView; 
} 

- (void)scrollViewDidZoom:(UIScrollView *)scrollView{ 
// The scroll view has zoomed, so we need to re-center the contents 
[self centerScrollViewContents]; 
} 


- (void)viewDidUnload{ 
[super viewDidUnload]; 
// Release any retained subviews of the main view. 
} 

- (void)didReceiveMemoryWarning{ 
[super didReceiveMemoryWarning]; 
// Dispose of any resources that can be recreated. 
} 

@end 

Answer 1

而不是

[self.scrollView addSubview:circleView]; 

我應該有

[self.imageView addSubview:circleView]; 

這解決了我的所有問題。

Answer 2

使用的UIScrollView的zoomScale財產。

float scale = self.scrollView.zoomScale; 
CGRect positionFrame = CGRectMake(500 * scale, 500 * scale ,5,5); 

調整位置scrollViewDidZoom:委託方法。