关于百度地图截屏的问题，前几天把自己搞的头大，后来发现，自己太SB了，走了这么长的弯路！原来百度SDK提供的有这么一个方法，就在BMKMapView.h中。截屏方法如下
/**
*获得地图当前可视区域截图
*@return 返回view范围内的截取的UIImage
*/
-(UIImage*) takeSnapshot;
/**
*获得地图区域区域截图
*@return 返回指定区域的截取的UIImage
*/
-(UIImage*) takeSnapshot:(CGRect)rect;
v2.7.0
自当前版本起，百度地图iOS SDK推出 .framework形式的开发包。此种类型的开发包配置简单、使用方便，欢迎开发者选用！
【 新 增 】
基础地图
- 增加地图缩放等级到20级（10米）；
- 新增地理坐标与OpenGL坐标转换接口：
BMKMapView新增接口：
- (CGPoint)glPointForMapPoint:(BMKMapPoint)mapPoint;//将BMKMapPoint转换为opengles可 以直接使用的坐标
- (CGPoint *)glPointsForMapPoints:(BMKMapPoint *)mapPoints count:(NSUInteger)count;// 批量将BMKMapPoint转换为opengles可以直接使用的坐标
3. 开放区域截图能力：
BMKMapView新增接口：
- (UIImage*)takeSnapshot:(CGRect)rect;// 获得地图区域区域截图
//获得某个范围内的屏幕图像
- (UIImage *)imageFromView: (UIView *) theView atFrame:(CGRect)r
{
UIGraphicsBeginImageContext(theView.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
UIRectClip(r);
[theView.layer renderInContext:context];
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;//[self getImageAreaFromImage:theImage atFrame:r];
}
//截取某个View
- (UIImage *)getImageFromView:(UIView *)theView
{
UIGraphicsBeginImageContext(theView.frame.size);
CGContextRef context =UIGraphicsGetCurrentContext();
[theView.layerrenderInContext:context];
UIImage *fectchImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return fectchImage;
}
//截取全屏
-(void)fullScreenshots{
UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];
UIGraphicsBeginImageContext(screenWindow.frame.size);//全屏截图，包括window
[screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
}
跟微信一样想要发送实时的定位图片 环信需要将上面那张截图转换成data64 在转换成string传过去 接收方需要接收到string 的图片 在转成data格式加载图片显示
部分代码:
发送:
CGRect imageRect = CGRectZero;
imageRect.size.width = SS(180);
imageRect.size.height = SS(100);
imageRect.origin.x = (self.mapView.width - imageRect.size.width) / 2;
imageRect.origin.y = (self.mapView.height - imageRect.size.height) / 2;
UIImage *image = [self.mapView takeSnapshot:imageRect];
image = [image stretchableImageWithLeftCapWidth:10 topCapHeight:10];
if (_delegate && [_delegate respondsToSelector:@selector(sendLocationModel:imageBase64String:)]) {
[_delegate sendLocationModel:model imageBase64String:[UIImageJPEGRepresentation(image, 1.0) base64EncodedStringWithOptions:0]];
[self.navigationController popViewControllerAnimated:YES];
}
//发送添加扩展字段
- (void)sendLocationMessageLatitude:(CLLocationDegrees)latitude
longitude:(CLLocationDegrees)longitude
name:(NSString *)name
address:(NSString *)address
imageBase64String:(NSString *)imageString {
EMMessage *message = [EaseSDKHelper getLocationMessageWithLatitude:latitude longitude:longitude address:address to:self.conversation.conversationId messageType:[self _messageTypeFromConversationType] messageExt:@{CHAT_LOCATION_EXT_KEY: name, CHAT_LOCATION_IMAGE_DATA: imageString}];
[self _sendMessage:message isNeedUploadFile:NO];
}
//添加环信messageExt扩展字段
+ (EMMessage *)getLocationMessageWithLatitude:(double)latitude
longitude:(double)longitude
address:(NSString *)address
to:(NSString *)to
messageType:(EMChatType)messageType
messageExt:(NSDictionary *)messageExt
{
EMLocationMessageBody *body = [[EMLocationMessageBody alloc] initWithLatitude:latitude longitude:longitude address:address];
NSString *from = [[EMClient sharedClient] currentUsername];
EMMessage *message = [[EMMessage alloc] initWithConversationID:to from:from to:to body:body ext:messageExt];
message.chatType = messageType;
return message;
}
接收:
case EMMessageBodyTypeLocation:
{
NSString *imageString = _model.message.ext[CHAT_LOCATION_IMAGE_DATA];
if (imageString.length > 0) {
NSData *decodedData = [[NSData alloc] initWithBase64EncodedString:imageString options:0];
_bubbleView.locationImageView.image = [UIImage imageWithData:decodedData];
} else {
_bubbleView.locationImageView.image = [[UIImage imageNamed:@"EaseUIResource.bundle/chat_location_preview"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];
}
NSString *name = _model.message.ext[CHAT_LOCATION_EXT_KEY];
if (name.length > 0 && ![name isEqualToString:@"[位置]"]) {
_bubbleView.locationLabel.text = name;
} else {
_bubbleView.locationLabel.text = _model.address;
}
}
break;
