項目中用到webview加載服務器輸出的頁面內容,其中的圖片需要放大展示。
使用手勢識別,配合執行js代碼的能力,如下代碼可以實現獲取圖片的鏈接:
在.h文件中添加UIGestureRecognizerDelegate
@interface DetailViewController : UIViewController <UIWebViewDelegate, UIGestureRecognizerDelegate> {
MBProgressHUD *HUD;
BOOL isLoaded; //是否已加載完成
}
在.m的viewDidLoad中添加
//添加點擊識別,識別webview中的圖片
UITapGestureRecognizer *gs = [[UITapGestureRecognizer alloc] init];
gs.numberOfTapsRequired = 1;
gs.delegate = self;
[self.view addGestureRecognizer:gs];
然後實現delegate事件,會實時獲取點擊的元素的src。
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
NSLog(@"TAPPED");
//Touch gestures below top bar should not make the page turn.
//EDITED Check for only Tap here instead.
if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
CGPoint touchPoint = [touch locationInView:self.view];
if(self.interfaceOrientation==UIInterfaceOrientationPortrait||self.interfaceOrientation==UIInterfaceOrientationPortraitUpsideDown) {
NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", touchPoint.x, touchPoint.y];
NSString *urlToSave = [self.detailWebView stringByEvaluatingJavaScriptFromString:imgURL];
NSLog(@"urlToSave :%@",urlToSave);
}
}
return YES;
}
獲取到以後,我們就可以根據url內容判斷類型,用新視圖加載顯示,做各種放大縮小分享等操作了。