我正在尝试使用 CATiledLayer 和 UIScrollView 显示一个大而高质量的可缩放图像。我的代码基于iOS 大图像缩小示例代码。
我的 UIScrollView 的层次结构是这样的:
- UIScrollView
- UIImageView : 代表大图的第一个缩略图
- 旧平铺视图
- 平铺视图
我希望滚动视图中的图像可以移动。
我尝试了我在这个StackOverflow 主题上找到的内容,并且它有效。但是在第一次放大图像后,就无法移动图像了。我不知道为什么?
这是我的代码:
-(id)initWithFrame:(CGRect)frame image:(UIImage*)_image {
if((self = [super initWithFrame:frame])) {
// Set up the UIScrollView
// Piece of code
self.canCancelContentTouches = NO;
UIPanGestureRecognizer* panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
[panGesture setMinimumNumberOfTouches:1];
[panGesture setMaximumNumberOfTouches:1];
[panGesture setDelegate:self];
[frontTiledView addGestureRecognizer:panGesture];
frontTiledView.exclusiveTouch = YES;
UIPanGestureRecognizer* panGesture2 = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
[panGesture2 setMinimumNumberOfTouches:1];
[panGesture2 setMaximumNumberOfTouches:1];
[panGesture2 setDelegate:self];
[backgroundImageView addGestureRecognizer:panGesture2];
backgroundImageView.exclusiveTouch = YES;
UIPanGestureRecognizer* panGesture3 = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
[panGesture3 setMinimumNumberOfTouches:1];
[panGesture3 setMaximumNumberOfTouches:1];
[panGesture3 setDelegate:self];
[backTiledView addGestureRecognizer:panGesture3];
backTiledView.exclusiveTouch = YES;
}
return self;
}
- (void)move:(UIGestureRecognizer*)sender {
CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:frontTiledView];
if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {
positionDeplacement = frontTiledView.center;
}
translatedPoint = CGPointMake(positionDeplacement.x+translatedPoint.x, positionDeplacement.y+translatedPoint.y);
frontTiledView.center = translatedPoint;
backTiledView.center = translatedPoint;
backgroundImageView.center = translatedPoint;
}
谢谢。