[英]ScrollView doesn't scroll in swift
I have an UIView and add an UIScrollView to it. 我有一个UIView并添加一个UIScrollView。 Inside the scrollView is an UIImageView.
scrollView内部是一个UIImageView。
I want to zoom the image view by pressing a button. 我想通过按下按钮来缩放图像视图。 If the image view is zoomed you should be able to scroll but that's not working.
如果图像视图被缩放,您应该能够滚动,但这不起作用。
Currently I have that: 目前我有:
self.imageView = UIImageView()
self.imageView.image = image
self.imageView.frame = self.contentView.bounds
self.scrollView = UIScrollView()
self.scrollView.frame = self.contentView.bounds
self.scrollView.contentSize = self.contentView.bounds.size
self.scrollView.addSubview(self.imageView)
self.contentView.addSubview(self.scrollView)
and that: 然后:
@IBAction func zoomPicture() {
if (scale <= 1.5) {
scale = scale + 0.1
scrollView.transform = CGAffineTransformMakeScale(scale, scale)
scrollView.zoomScale = scale
scrollView.maximumZoomScale = 1.5
scrollView.minimumZoomScale = 1.0
scrollView.contentSize = contentView.bounds.size
scrollView.scrollEnabled = true
}
}
my class also implements UIScrollViewDelegate
and I set the delegate in the viewDidLoad() function. 我的类也实现了
UIScrollViewDelegate
,我在viewDidLoad()函数中设置了委托。 I have also added the viewForZoomingInScrollView
function. 我还添加了
viewForZoomingInScrollView
函数。 The zoom works but I can't scroll. 缩放工作,但我无法滚动。
For this issue you have to set self.scrollView.contentSize
bigger than self.contentView.bounds
so it get proper space to scroll. 对于此问题,您必须将
self.scrollView.contentSize
设置self.scrollView.contentSize
大于self.contentView.bounds
以便获得适当的滚动空间。
replace this line 替换这一行
self.scrollView.contentSize = self.contentView.bounds.size
to this: 对此:
self.scrollView.contentSize = self.contentView.bounds.size*2 //or what ever size you want to set
Try this: 试试这个:
@IBAction func zoomPicture() {
if (scale <= 1.5) {
scale = scale + 0.1
scrollView.zoomScale = scale
scrollView.maximumZoomScale = 1.5
scrollView.minimumZoomScale = 1.0
let size = contentView.bounds.size
scrollView.contentSize = CGSize(width: size.width * scale, height: size.height * scale)
scrollView.scrollEnabled = true
}
}
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