UIWebView长按保存图片js交互
demo地址：https://github.com/daijuqing/UIWebViewCopyImage
#import "ViewController.h"static NSString* const kTouchJavaScriptString=@"document.ontouchstart=function(event){\x=event.targetTouches[0].clientX;\y=event.targetTouches[0].clientY;\document.location=\"myweb:touch:start:\"+x+\":\"+y;};\document.ontouchmove=function(event){\x=event.targetTouches[0].clientX;\y=event.targetTouches[0].clientY;\document.location=\"myweb:touch:move:\"+x+\":\"+y;};\document.ontouchcancel=function(event){\document.location=\"myweb:touch:cancel\";};\document.ontouchend=function(event){\document.location=\"myweb:touch:end\";};";@interface ViewController (){
UIWebView *_webView;
NSTimer *_timer;
NSInteger _gesState;
NSString *_imgURL;
}
@end
@implementation ViewController
typedef NS_ENUM(NSInteger, GESTURE_STATE) { GESTURE_STATE_START, GESTURE_STATE_MOVE, GESTURE_STATE_END};
- (void)viewDidLoad {
[super viewDidLoad];
[self loadWebView];
}
- (void)loadWebView{
_webView = [[UIWebView alloc]initWithFrame:self.view.bounds];
[self.view addSubview:_webView];
_webView.delegate =self;
NSURL *url = [NSURL URLWithString:@"http://m.baidu.com"];
NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url];
[_webView loadRequest:request];
}
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)_request navigationType:(UIWebViewNavigationType)navigationType
{
NSString *requestString = [[_request URL] absoluteString];
NSArray *components = [requestString componentsSeparatedByString:@":"];
if ([components count] > 1 && [(NSString *)[components objectAtIndex:0] isEqualToString:@"myweb"])
{
if([(NSString *)[components objectAtIndex:1] isEqualToString:@"touch"])
{
if ([(NSString *)[components objectAtIndex:2] isEqualToString:@"start"])
{
/*
@需延时判断是否响应页面内的js...
*/
_gesState = GESTURE_STATE_START;
NSLog(@"touch start!");
float ptX = [[components objectAtIndex:3]floatValue];
float ptY = [[components objectAtIndex:4]floatValue];
NSLog(@"touch point (%f, %f)", ptX, ptY);
NSString *js = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).tagName", ptX, ptY];
NSString * tagName = [_webView stringByEvaluatingJavaScriptFromString:js];
_imgURL = nil;
if ([tagName isEqualToString:@"IMG"])
{
_imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", ptX, ptY];
}
if (_imgURL)
{
_timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(handleLongTouch) userInfo:nil repeats:NO];
}
}
else if ([(NSString *)[components objectAtIndex:2] isEqualToString:@"move"])
{
//**如果touch动作是滑动，则取消hanleLongTouch动作**//
_gesState = GESTURE_STATE_MOVE;
NSLog(@"you are move");
}
}
else if ([(NSString*)[components objectAtIndex:2]isEqualToString:@"end"])
{
[_timer invalidate];
_timer = nil;
_gesState = GESTURE_STATE_END;
NSLog(@"touch end");
}
return NO;
}
return YES;
}
- (void)handleLongTouch {
NSLog(@"%@", _imgURL);
if (_imgURL && _gesState == GESTURE_STATE_START) {
UIActionSheet* sheet =[[UIActionSheet alloc]initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"保存图片", nil];
sheet.cancelButtonIndex = sheet.numberOfButtons - 1;
[sheet showInView:[UIApplication sharedApplication].keyWindow];
}
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (actionSheet.numberOfButtons - 1 == buttonIndex) {
return;
}
NSString* title = [actionSheet buttonTitleAtIndex:buttonIndex];
if ([title isEqualToString:@"保存图片"]) {
if (_imgURL) {
NSLog(@"imgurl = %@", _imgURL);
}
NSString *urlToSave = [_webView stringByEvaluatingJavaScriptFromString:_imgURL];
NSLog(@"image url=%@", urlToSave);
NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlToSave]];
UIImage* image = [UIImage imageWithData:data];
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo
{
if (error){
NSLog(@"Error");
// [self showAlert:SNS_IMAGE_HINT_SAVE_FAILE];
}else {
NSLog(@"OK");
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"提醒" message:@"保存成功!" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alertView show];
}
}
-(void)webViewDidFinishLoad:(UIWebView *)webView {
[_webView stringByEvaluatingJavaScriptFromString:kTouchJavaScriptString];
}
@end
