[英]Zoom UICollectionView via pinch gesture
我有一個UICollectionView
,里面有很多單元格(大約5k +)。 我想捏放大/縮小。 我已經嘗試在每個捏合上invalidateLayout
。 真的很慢 所以我想使用CGAffineTransformMakeScale
但是在此之后我不知道如何滾動。 我的代碼是:
- (void)didReceivePinchGesture:(UIPinchGestureRecognizer *)gesture {
static CGFloat scaleStart;
if (gesture.state == UIGestureRecognizerStateBegan) {
scaleStart = self.venueLayoutZoom;
}
else if (gesture.state == UIGestureRecognizerStateChanged) {
CGAffineTransform transform = CGAffineTransformMakeScale(self.venueLayoutZoom, self.venueLayoutZoom);
self.activeCollectionNode.view.transform = transform;
self.activeCollectionNode.view.contentSize = CGSizeMake(318 * self.venueLayoutZoom, 500 * self.venueLayoutZoom);
}
}
但是當放大時,我無法左右滾動。 幫幫我。
采用
@interface ViewController () <UICollectionViewDataSource,
UICollectionViewDelegate, UICollectionViewDelegateFlowLayout>
@property (nonatomic,assign) CGFloat scale;
@property (nonatomic,weak) IBOutlet UICollectionView *collectionView;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.scale = 1.0;
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
UIPinchGestureRecognizer *gesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(didReceivePinchGesture:)];
[self.collectionView addGestureRecognizer:gesture];
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:
(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:
(NSIndexPath *)indexPath
{
return CGSizeMake(50*self.scale, 50*self.scale);
}
- (void)didReceivePinchGesture:(UIPinchGestureRecognizer*)gesture
{
static CGFloat scaleStart;
if (gesture.state == UIGestureRecognizerStateBegan)
{
scaleStart = self.scale;
}
else if (gesture.state == UIGestureRecognizerStateChanged)
{
self.scale = scaleStart * gesture.scale;
[self.collectionView.collectionViewLayout invalidateLayout];
}
}
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