Xcode Swift 图像缩放手势
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Xcode Swift image zoom gesture
提问by Flemming Ovesen
Hope someone can help me. Im trying to make a zoom gesture, so when the image are presented the user can zoom the image with fingers.
希望可以有人帮帮我。我试图做一个缩放手势，所以当图像出现时，用户可以用手指缩放图像。
My code to present the image are:
我呈现图像的代码是：
// MARK: Show image full screen
func imageTapped(img: AnyObject) {
self.navigationController?.navigationBarHidden = true
let imageView = productImage as UIImageView
let newImageView = UIImageView(image: imageView.image)
newImageView.frame = self.view.frame
newImageView.backgroundColor = .blackColor()
newImageView.contentMode = .ScaleToFill
newImageView.userInteractionEnabled = true
let tap = UITapGestureRecognizer(target: self, action: "dismissFullscreenImage:")
newImageView.addGestureRecognizer(tap)
self.view.addSubview(newImageView)
}
func dismissFullscreenImage(sender: UITapGestureRecognizer) {
sender.view?.removeFromSuperview()
self.navigationController?.navigationBarHidden = false
}
回答by Shrikant Tanwade
Use UIScrollView and add UIImgeView in scroll view
使用 UIScrollView 并在滚动视图中添加 UIImgeView
import UIKit
class ViewController: UIViewController,UIScrollViewDelegate
{
var scrollV : UIScrollView!
var imageView : UIImageView!
override func viewDidLoad()
{
super.viewDidLoad()
self.navigationController?.navigationBarHidden = true
scrollV=UIScrollView()
scrollV.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height)
scrollV.minimumZoomScale=1
scrollV.maximumZoomScale=3
scrollV.bounces=false
scrollV.delegate=self;
self.view.addSubview(scrollV)
imageView=UIImageView()
imageView.image = UIImage(imageLiteral: "neymar.jpg")
imageView.frame = CGRectMake(0, 0, scrollV.frame.width, scrollV.frame.height)
imageView.backgroundColor = .blackColor()
imageView.contentMode = .ScaleToFill
scrollV.addSubview(imageView)
}
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView?
{
return imageView
}
}
回答by Yuvraj Sinh
Take gesture programmatically and make its method and write down this code in the method.
以编程方式获取手势并制作其方法并将此代码写在方法中。
pinchRecognizerOnView()is my method name. Take one view or image view inside view controller and add this new view in that.Now apply gesture method on this new view.
pinchRecognizerOnView()是我的方法名称。在视图控制器中获取一个视图或图像视图并在其中添加这个新视图。现在在这个新视图上应用手势方法。
func pinchRecognizerOnView(sender: UIPinchGestureRecognizer!) {
sender.view?.transform = CGAffineTransformScale((sender.view?.transform)!, sender.scale, sender.scale)
sender.scale = 1
// its for zoom in out screen
}
