邊界和與縮放

Question

所以綱領性的UIScrollView的錨固，我已經成功地創建與編程縮放方法一個UIScrollView，但我有點卡住了怎麼解決我與縮放有一個問題：

1. 當我放大或縮小伸展/縮回位置的位置時，我在捏手勢的位置不會發生，它發生在一個角落。

2. 放大或縮小後，會在邊界外留下額外的空間，並且我無法將圖像滾動超過圖像高度的一半寬度&。

除此之外，我很接近讓它工作100％。我嘗試過使用achorpoints，但它看起來像滾動視圖和圖像視圖不響應此。

這裏是重要的東西在代碼：

UIScrollView *mapScrollView; 

UIImageView *mapImageView; 

CGFloat lastScale = 0; 

NSMutableArray *map_List; 


- (id)initWithFrame:(CGRect)frame { 

    self = [super initWithFrame:frame]; 
    if (self) { 

    mainMenuAppDelegate *del = (mainMenuAppDelegate *)[[UIApplication sharedApplication] delegate]; 

    map_List = [[NSMutableArray alloc] init]; 
    [map_List addObject:@"Pacific_Map_8bit.png"]; 
    [map_List addObject:@"Atlantic_Map_8bit.png"]; 


    CGRect mapScrollViewFrame = CGRectMake(0, 0, 1024, 768); 

    mapScrollView = [[UIScrollView alloc] initWithFrame:mapScrollViewFrame]; 

    mapScrollView.contentSize = CGSizeMake(2437, 1536); 


    UIImage *mapImage = [UIImage imageNamed:[map_List objectAtIndex:mapNum]]; 

    mapImageView = [[UIImageView alloc] initWithImage: mapImage]; 

    mapScrollView.bounces = NO; 

    [mapImage release]; 

    [mapScrollView addSubview:mapImageView]; 
    [self addSubview:mapScrollView]; 

    mapImageView.userInteractionEnabled = YES; 


    UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)]; 
    [mapImageView addGestureRecognizer:pinchRecognizer]; 

    [pinchRecognizer release]; 
    } 
    return self; 

} 
// the scale method thats triggered to zoom when pinching 
-(void)scale:(id)sender { 

if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) { 

    lastScale = 1.0; 
    return; 
} 

CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]); 

NSLog(@"map scale %f", scale); 

CGFloat mapWidth = mapImageView.frame.size.width; 
CGFloat mapHeight = mapImageView.frame.size.height; 
NSLog(@"map width %f", mapWidth); 

if(scale>=1 & mapWidth<=4000 || scale<1 & mapWidth>=1234){ 

    CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform; 
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale); 
    [[(UIPinchGestureRecognizer*)sender view] setTransform:newTransform]; 

    lastScale = [(UIPinchGestureRecognizer*)sender scale]; 

} 

mapScrollView.contentSize = CGSizeMake(mapWidth, mapHeight); 

} 

謝謝！

Answer 1

UIScrollView具有內置縮放支持。您只需設置minimumZoomScale和maximumZoomScale屬性，然後返回一個視圖用於使用viewForZoomingInScrollView進行縮放。