最近在用swift仿寫今日頭條,利用Charles抓包工具,這里有詳細使用方法,
寫了一個圖片點擊放大的UIImageView的分類
首先創(chuàng)建分類,由于我剛學swift,還沒有找到可以直接創(chuàng)建分類的方法,所以創(chuàng)建分類的時候我是直接創(chuàng)建swift文件,然后自己添加,然后利用runtime 給分類添加屬性
話不多說,直接上代碼,使用的時候自己創(chuàng)建一個swift file 空文件,把以下代碼復制粘貼過去,直接調(diào)用
//cell 上的 圖片點擊縮放
cell.picImageView.scaleImageView()
import UIKit
extension UIImageView :UIScrollViewDelegate {//這里繼承代理
//給分類添加屬性
var originImageRect: CGRect? {
set {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key".hashValue)
objc_setAssociatedObject(self, key, newValue, .OBJC_ASSOCIATION_COPY_NONATOMIC)
}
get {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key".hashValue)
let obj: CGRect? = objc_getAssociatedObject(self, key) as? CGRect
return obj
}
}
var container_ScrollView: UIScrollView? {
set {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key1".hashValue)
objc_setAssociatedObject(self, key, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
get {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key1".hashValue)
let obj: UIScrollView? = objc_getAssociatedObject(self, key) as? UIScrollView
return obj
}
}
var container_View: UIView? {
set {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key2".hashValue)
objc_setAssociatedObject(self, key, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
get {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key2".hashValue)
let obj: UIView? = objc_getAssociatedObject(self, key) as? UIView
return obj
}
}
var snapShotView: UIView? {
set {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key3".hashValue)
objc_setAssociatedObject(self, key, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
get {
let key: UnsafeRawPointer! = UnsafeRawPointer.init(bitPattern: "key3".hashValue)
let obj: UIView? = objc_getAssociatedObject(self, key) as? UIView
return obj
}
}
//點擊縮放手勢
func scaleImageView() {
let window = UIApplication.shared.keyWindow
let image = self.image
originImageRect = self .convert(self.bounds, to: window)
container_ScrollView = UIScrollView(frame: CGRect( x: 0, y :0,width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height))
container_ScrollView?.delegate = self;
container_ScrollView?.isMultipleTouchEnabled = true
container_ScrollView?.maximumZoomScale = 3.0
container_View = UIView()
container_View?.frame = (container_ScrollView?.frame)!
container_View?.backgroundColor = UIColor.init(colorLiteralRed: 0, green: 0, blue: 0, alpha: 0)
snapShotView = self.snapshotView(afterScreenUpdates: true)
snapShotView?.frame = originImageRect!
container_View?.addSubview(snapShotView!)
container_ScrollView?.addSubview(container_View!)
window?.addSubview(container_ScrollView!)
container_ScrollView?.addTarget(target: self, action: #selector(self.hideImage))
container_ScrollView?.backgroundColor = UIColor.init(colorLiteralRed: 0, green: 0, blue: 0, alpha: 0)
let rate = UIScreen.main.bounds.size.width / (image?.size.width)!
let finalRect = CGRect(x:0, y:( UIScreen.main.bounds.size.height - (image?.size.height)! * rate ) / 2, width:UIScreen.main.bounds.size.width,height:(image?.size.height)! * rate)
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: .curveEaseOut, animations: {
self.snapShotView?.frame = finalRect
self.container_ScrollView?.backgroundColor = UIColor.init(colorLiteralRed: 0, green: 0, blue: 0, alpha: 1.0)
}) { (finished) in
}
}
//縮放隱藏
func hideImage() {
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: .curveEaseOut, animations: {
self.container_ScrollView?.zoomScale = 1.0
self.snapShotView?.frame = self.originImageRect!
self.container_ScrollView?.backgroundColor = UIColor.init(colorLiteralRed: 0, green: 0, blue: 0, alpha: 0)
self.container_ScrollView?.removeFromSuperview()
}) { (finished) in
}
}
public func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return container_View
}
}
但是暫時還不支持長圖片的預覽,以后再更新