我有一个包含一个自定义单元格的 CollectionView。
我想在单元格中放大/缩小 imageView,所以我在 CollectionView.m 中添加了捏合手势
当我向 self.collectionView 添加手势时,如下所示:
[self.collectionView addGestureRecognizer:pinchGesture];
有效!我的 cell.imageView 可以放大/缩小,但是当我捏其他地方时(不是在单元格的 imageView 中,我的 cell.imageView 仍然用手势放大/缩小,我希望 cell.imageView 放大/缩小时用户捏cell.imageView,所以我尝试使用此代码添加手势:
[cell.imageView addGestureRecognizer:pinchGesture];
但不幸的是它不起作用。当我捏住单元格的 imageView 时没有任何反应。
所以我的问题是,是否可以仅在用户捏住单元格的 ImageView 时放大/缩小单元格的 ImageView ?不是其他地方。
最佳答案
//cell.h
#import <UIKit/UIKit.h>
@interface Cell : UICollectionViewCell
@property (weak, nonatomic) IBOutlet UIScrollView *scrollview;
@property (weak, nonatomic) IBOutlet UIImageView *imageview;
- (void)setup;
@end
//cell.m
#import "Cell.h"
#define MAXIMUM_SCALE 3.0
#define MINIMUM_SCALE 1.0
@interface Cell()<UIScrollViewDelegate>
@end
@implementation Cell
- (void)setup {
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(zoomImage:)];
self.imageview.gestureRecognizers = @[pinch];
self.imageview.userInteractionEnabled = YES;
self.scrollview.delegate = self;
}
//-----------------------------------------------------------------------
#pragma mark - Scrollview Delegate Method
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return self.imageview;
}
//-----------------------------------------------------------------------
#pragma mark - Custom Methods
- (void)zoomImage:(UIPinchGestureRecognizer *)gesture {
if (gesture.state == UIGestureRecognizerStateEnded
|| gesture.state == UIGestureRecognizerStateChanged) {
NSLog(@"gesture.scale = %f", gesture.scale);
CGFloat currentScale = self.frame.size.width / self.bounds.size.width;
CGFloat newScale = currentScale * gesture.scale;
if (newScale < MINIMUM_SCALE) {
newScale = MINIMUM_SCALE;
}
if (newScale > MAXIMUM_SCALE) {
newScale = MAXIMUM_SCALE;
}
CGAffineTransform transform = CGAffineTransformMakeScale(newScale, newScale);
self.imageview.transform = transform;
self.scrollview.contentSize = self.imageview.frame.size;
}
}
@end
View Controller 文件
//ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@end
//ViewController.m[![enter image description here][1]][1]
#import "ViewController.h"
#import "Cell.h"
@interface ViewController ()<UICollectionViewDataSource, UICollectionViewDelegate>
@property (weak, nonatomic) IBOutlet UICollectionView *collectionView;
@property (strong, nonatomic) NSArray *imageArray;
@end
@implementation ViewController
//-----------------------------------------------------------------------
#pragma mark - Collectionview Datasource Methods
//-----------------------------------------------------------------------
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return self.imageArray.count;
}
//-----------------------------------------------------------------------
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
Cell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
[cell setup];
cell.imageview.image = [UIImage imageNamed:[self.imageArray objectAtIndex:indexPath.row]];
return cell;
}
//-----------------------------------------------------------------------
#pragma mark - Lifecycle method
- (void)viewDidLoad {
[super viewDidLoad];
_imageArray = @[ @"1.jpg", @"1.jpg" ];
self.collectionView.dataSource = self;
self.collectionView.delegate = self;
}
//-----------------------------------------------------------------------
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
注意:您需要为 Storyboard中的 ScrollView 、 ImageView 和 Collection View 创建一个 IBOutlet。
关于ios - 仅当捏住单元格的 imageView 时,才可以在 UICollectionView 的自定义单元格中放大/缩小 UIImageView?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33546395/