我在 xib 中有两个滚动视图，它们都包含一个非常大的图像，应该从完全按比例缩小以适合。第一个 ScrollView 完美运行，当您缩放或滚动时，对象都在正确移动，但第二个 ScrollView 开始完全放大，无法缩小。
ScrollView 现在显示 25% 的图像（在 0,0 处完全放大），也无法拖动以查看其余部分。如果我捏缩放，图像沿对角线向上和向左移动而根本不缩放，我现在可以将图像拖回 0,0 并返回到它对角滚动的最大点。
.h 文件
UIScrollView *_scrollView;
UIScrollView *_miamiScrollView;
UIView *_mapImageView;
UIView *_mapMiamiView;
UIView *_mapContentView;
NSArray *_autoLayoutViews;
NSArray *_staticViews;
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;//(linked to working scrollview)
@property (strong, nonatomic) IBOutlet UIScrollView *miamiScrollView;//(Linked to 'broken' scrollview)
.m 文件
- (void)viewDidLoad
{
[self _customizeViews];
}
- (void) _customizeViews
{
UIImageView *mapImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"MainGameDisplay.jpg"]];
mapImageView.userInteractionEnabled = YES;
UIImageView *mapMiamiView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"miami.jpg"]];
mapMiamiView.userInteractionEnabled = YES;
_mapContentView = [[UIView alloc] initWithFrame:CGRectMake(0, 50, 568, 270)];
_mapContentView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
_mapContentView.clipsToBounds = YES;
_mapContentView.userInteractionEnabled = YES;
[_mapContentView addSubview:_scrollView];
[_mapContentView addSubview:_miamiScrollView];
[self.view addSubview:_mapContentView];
[self.view sendSubviewToBack:_mapContentView];
UIScrollView *scrollView = _scrollView;
CGRect scrollFrame = scrollView.frame;
scrollFrame.origin = CGPointZero;
scrollView.frame = scrollFrame;
scrollView.delegate = self;
scrollView.minimumZoomScale = 1;
scrollView.maximumZoomScale = 1.0;
[scrollView addSubview:mapImageView];
scrollView.contentSize = mapImageView.frame.size;
_scrollView = scrollView;
_mapImageView = mapImageView;
UIScrollView *miamiScrollView = _miamiScrollView;
CGRect miamiScrollFrame = CGRectMake(0 , 270, 568, 270);
scrollFrame.origin = CGPointZero;
miamiScrollView.frame = miamiScrollFrame;
miamiScrollView.delegate = self;
miamiScrollView.minimumZoomScale = 0.125;
miamiScrollView.maximumZoomScale = 1;
[miamiScrollView addSubview:mapMiamiView];
miamiScrollView.contentSize = mapMiamiView.frame.size;
_miamiScrollView = miamiScrollView;
_mapMiamiView = mapMiamiView;
[self _setupAutolayoutViews];
[self _setupStaticViews];
[self _zoomToFit: _scrollView];
[self _zoomToFit: _miamiScrollView];
[self _updatePositionForViews:_autoLayoutViews];
}
- (void) _zoomToFit: (UIScrollView*)view
{
CGFloat contentWidth = view.contentSize.width;
CGFloat contentHeigth = view.contentSize.height;
CGFloat viewWidth = view.frame.size.width;
CGFloat viewHeight = view.frame.size.height;
CGFloat width = viewWidth / contentWidth;
CGFloat heigth = viewHeight / contentHeigth;
CGFloat scale = MAX(width, heigth);
if ( scale < view.minimumZoomScale ) {
view.minimumZoomScale = scale;
} else if ( scale > view.maximumZoomScale ) {
view.maximumZoomScale = scale;
}
view.zoomScale = scale;
}
#pragma mark - Positions
- (void) _updatePositionForViews:(NSArray *)views
{
CGFloat scale = _scrollView.zoomScale;
CGPoint contentOffset = _scrollView.contentOffset;
contentOffset.x -= _scrollView.frame.origin.x;
contentOffset.y -= _scrollView.frame.origin.y;
for ( UIView *view in views ) {
CGPoint basePosition = [self _basePositionForView:view];
[self _updatePositionForView:view scale:scale basePosition:basePosition offset:contentOffset];
}
}
- (CGPoint) _basePositionForView:(UIView *)view
{
NSString *key = [NSString stringWithFormat:@"%d", view.tag];
NSString *stringValue = [_coordinates objectForKey:key];
NSArray *values = [stringValue componentsSeparatedByString:@":"];
if ( [values count] < 2 ) return CGPointZero;
CGPoint result = CGPointMake([[values objectAtIndex:0] floatValue], [[values objectAtIndex:1] floatValue]);
return result;
}
- (void) _updatePositionForView:(UIView *)view scale:(CGFloat)scale basePosition:(CGPoint)basePosition offset:(CGPoint)offset;
{
CGPoint position;
position.x = (basePosition.x * scale) - offset.x;
position.y = (basePosition.y * scale) - offset.y;
CGRect frame = view.frame;
frame.origin = position;
view.frame = frame;
}
//////////////////////////////////////////////////////////////////////////////////////
#pragma mark - UIScrollViewDelegate
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;
{
[self _lockInteraction];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
{
[self _unlockInteraction];
}
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
{
[self _lockInteraction];
}
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale;
{
[self _unlockInteraction];
}
- (void) _lockInteraction
{
[self _setControls:_staticViews interacted:NO];
[self _setControls:_autoLayoutViews interacted:NO];
}
- (void) _unlockInteraction
{
[self _setControls:_staticViews interacted:YES];
[self _setControls:_autoLayoutViews interacted:YES];
}
- (void) _setControls:(NSArray *)controls interacted:(BOOL)interacted
{
for ( UIControl *control in controls ) {
if ( [control isKindOfClass:[UIControl class]]) {
control.userInteractionEnabled = interacted;
}
}
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
[self _updatePositionForViews:_autoLayoutViews];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
[self _updatePositionForViews:_autoLayoutViews];
}
- (UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView;
{
return _mapImageView;
}
//DEFAULT BUTTONS.
- (void) _setupAutolayoutViews
{
UIButton *btn1 = [UIButton buttonWithType: UIButtonTypeDetailDisclosure];
[btn1 addTarget:self action:@selector(quickTest:) forControlEvents:UIControlEventTouchUpInside];
btn1.tag = kAddContactButton;
btn1.center = CGPointZero;
[_mapContentView addSubview:btn1];
_autoLayoutViews = [[NSArray alloc] initWithObjects:btn1, nil];
}
//CUSTOM BUTTONS.
- (void) _setupStaticViews
{
UIButton *openMiamiButton = [UIButton buttonWithType:UIButtonTypeCustom];
[openMiamiButton setBackgroundImage:[UIImage imageNamed:@"logo.png"] forState:UIControlStateNormal];
[openMiamiButton addTarget:self action:@selector(quickTest:) forControlEvents:UIControlEventTouchUpInside];
openMiamiButton.frame = CGRectMake(0.0 ,0.0, 50.0, 50.0);
openMiamiButton.tag = OpenMiamiButton;
openMiamiButton.enabled = YES;
openMiamiButton.alpha = 0.5;
[_mapImageView addSubview:openMiamiButton];
_staticViews = @[openMiamiButton,];
for ( UIView *view in _staticViews ) {
CGPoint point = [self _basePositionForView:view];
CGRect frame = view.frame;
frame.origin = point;
view.frame = frame;
}
}
//And for the transition between views:
-(void) quickTest: (UIButton *)button
{
/*
if (!openMiami)
openMiami = [[MiamiGameDisplay alloc] initWithNibName:nil bundle:nil];
openMiami.mainPage = self;
[self.navigationController pushViewController:openMiami animated:YES];
*/
if (!testBool){
[UIView animateWithDuration:0.5f
animations:^{
_scrollView.frame = CGRectMake(0 , -270, 568, 270);
}
completion:Nil];
[UIView animateWithDuration:0.5f
animations:^{
_miamiScrollView.frame = CGRectMake(0 , 0, 568, 270);
}
completion:Nil];
testBool=YES;
}
else {
[UIView animateWithDuration:0.5f
animations:^{
_miamiScrollView.frame = CGRectMake(0 , 270, 568, 270);
}
completion:Nil];
[UIView animateWithDuration:0.5f
animations:^{
_scrollView.frame = CGRectMake(0 , 0, 568, 270);
}
completion:Nil];
testBool=NO;
}
}