I have a UIImageView element as a subview of my main UIScrollView element. I want the Image to fill out the whole screen at all times, but I can drag the edges a bit too far, so that the yellow "background" becomes visible. If I lift my finger, the Image "bounces" back and fills out the screen correctly.
I want to prevent this dragging of the image off screen. I do however want the image to bounce back once I drag it out of the "safety area".
This is my ScrollView initialization:
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:CGRectMake(0, 0, frame.size.height, frame.size.width)];
if (self) {
[self initImageValues];
self.showsVerticalScrollIndicator = NO;
self.showsHorizontalScrollIndicator = NO;
self.bouncesZoom = YES;
self.decelerationRate = UIScrollViewDecelerationRateFast;
self.delegate = self;
self.backgroundColor = [UIColor yellowColor];
self.minimumZoomScale = 1.0;
self.maximumZoomScale = 2.0;
[self setCanCancelContentTouches:YES];
self.clipsToBounds = YES;
// Load Image
imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]];
[self addSubview:imageView];
[self setContentSize: CGSizeMake(imageView.frame.size.width, imageView.frame.size.height)];
// Set bigger "bounce" zone (safety area)
self.contentInset=UIEdgeInsetsMake(-SAFETY_ZONE,-SAFETY_ZONE,-SAFETY_ZONE,-SAFETY_ZONE);
self.scrollEnabled = YES;
}
return self;}
Use these delegate methods:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
Then read the offset and return if it's out of the "safety area".
Could be that you need another delegate method from the UIScrollView though, but a workaround like this should fix your problem :)
尝试将其bounces
属性设置为NO
。
尝试在scrollview上设置反弹:
self.bounces = NO;
TRY this: **
self.scrollView.maximumZoomScale = 1.0;
self.scrollView.minimumZoomScale = 1.0;
**
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