https://github.com/kk-vv/hshowwebimage
获取UIWebView 中的图片
https://github.com/kk-vv/hshowwebimage
Last synced: 3 months ago
JSON representation
获取UIWebView 中的图片
- Host: GitHub
- URL: https://github.com/kk-vv/hshowwebimage
- Owner: kk-vv
- Created: 2016-01-19T08:35:36.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2016-01-19T08:40:18.000Z (over 9 years ago)
- Last Synced: 2023-06-12T10:26:55.658Z (almost 2 years ago)
- Language: Swift
- Size: 24.4 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
### 通过Tap事件获取 UIWebView 中的图片
===
##### 需求:
- 通过点击UIWebView，获取相应位置中的图片URL 并浏览。
- 也可自己扩展其他内容，如对webView中的`图片长按保存`或者`长按识别二维码`思路都是一样的
##### 思路：
- 给UIWebView添加Tap手势
- 获取Tap事件的点击坐标，转换为WebView 中得位置偏移量Point
- 给WebView注意本地JS方法，传入Point获取相应的HTML标签元素
##### 注意：
- 为确保我们的添加在UIWebView上的Tap手势会正常执行需添加以下代码：
```
tapGesture.cancelsTouchesInView = false
//MARK: UIGestureDelegate
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
```
- [相关手势介绍可参考该片博文](http://www.cnblogs.com/salam/archive/2013/04/30/iOS_gesture.html)
##### Tap手势事件：
```
func touchOnWebViewRecognizedForWeb(gestureRecognizer: UITapGestureRecognizer) {
var point = gestureRecognizer.locationInView(webView)
// convert point from view to HTML coordinate system
let viewSize = webView.frame.size
let windowSize = webView.windowSize()
let f = windowSize.width / viewSize.width;
if (Double(UIDevice.currentDevice().systemVersion) >= 5.0) {
point.x = point.x * f
point.y = point.y * f
} else {
// On iOS 4 and previous, document.elementFromPoint is not taking
// offset into account, we have to handle it
let offset = webView.scrollOffset()
point.x = point.x * f + offset.x
point.y = point.y * f + offset.y
}
let path = NSBundle.mainBundle().pathForResource("JSTools", ofType: "js")
do{
let jsCode = try NSString(contentsOfFile: path!, encoding: NSUTF8StringEncoding)
webView.stringByEvaluatingJavaScriptFromString(jsCode as String)
let tags = webView.stringByEvaluatingJavaScriptFromString(String(format: "getHTMLElementsAtPoint(%i,%i);", Int(point.x),Int(point.y)))//奇葩的Swift 不强转Int 得到的居然是0
let tagsSRC = webView.stringByEvaluatingJavaScriptFromString(String(format: "getLinkSRCAtPoint(%i,%i);", Int(point.x),Int(point.y)))
print("src:\(tags)")
print("src:\(tagsSRC)")
if tags?.rangeOfString(",IMG,") != nil{
if let imgurl = tagsSRC{
print("find it:\(imgurl)")
self.view.bringSubviewToFront(activityIndicator)
activityIndicator.startAnimating()
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { () -> Void in
let data = NSData(contentsOfURL: NSURL(string: imgurl)!)
if let image = UIImage(data: data!){
dispatch_async(dispatch_get_main_queue(), { [unowned self]() -> Void in
self.activityIndicator.stopAnimating()
self.showImageView(image)
})
}else{
self.activityIndicator.stopAnimating()
}
})
}
}
}catch let error as NSError{
print("Get JSTools Error.\(error.description),\(error.userInfo)")
}
}
```
##### 效果图
---
[SourceCode](https://github.com/iFallen/HShowWebImage)