[英]How to implement a phonegap call back to javascript
I have the following code perfectly working, except ... well for the call back ! 我有以下代码可以正常工作,除了...很好的回调!
- (void)readBarcode:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options
{
ZBarReaderViewController *reader = [ZBarReaderViewController new];
reader.readerDelegate = self;
ZBarImageScanner *scanner = reader.scanner;
[scanner setSymbology: ZBAR_EAN13
config: ZBAR_CFG_ENABLE
to: 1];
[[super appViewController] presentModalViewController:reader animated:YES];
[reader release];
}
(void) imagePickerController:(UIImagePickerController*)reader didFinishPickingMediaWithInfo: (NSDictionary*) info
{
id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
break;
resultText.text = symbol.data;
resultImage.image = [info objectForKey: UIImagePickerControllerOriginalImage];
NSString* retStr = [[NSString alloc]
initWithFormat:@"%@({ code: '%@', image: '%@' });",
resultText.text,resultImage.image];
[ webView stringByEvaluatingJavaScriptFromString:retStr ];
[reader dismissModalViewControllerAnimated: YES];
}
I then call the function from javascript : 然后,我从javascript调用函数:
function getIt(){
PhoneGap.exec("BarcodeReader.readBarcode", "myCallback");
}
Problem is that I don't understand how to call the 'myCallBack' function from c# (admit i'm a total newbie) 问题是我不理解如何从C#调用“ myCallBack”函数(承认我是新手)
This should work... 这应该工作...
Add property to header file ( How To Add A Property In Objective C ) 将属性添加到头文件( 如何在目标C中添加属性 )
-(NSString *) jsCallback;
Get the javascript callback method and set the property 获取javascript回调方法并设置属性
- (void)readBarcode:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options
{
ZBarReaderViewController *reader = [ZBarReaderViewController new];
reader.readerDelegate = self;
// New Property added !!!!
NSString * jsCallback = [info objectAtIndex:0];
ZBarImageScanner *scanner = reader.scanner;
[scanner setSymbology: ZBAR_EAN13
config: ZBAR_CFG_ENABLE
to: 1];
[[super appViewController] presentModalViewController:reader animated:YES];
[reader release];
}
Use the javascript callback method here 在此处使用javascript回调方法
- (void) imagePickerController:(UIImagePickerController*)reader didFinishPickingMediaWithInfo: (NSDictionary*) info
{
id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
break;
resultText.text = symbol.data;
resultImage.image = [info objectForKey: UIImagePickerControllerOriginalImage];
// create the string
NSString* retStr = [[NSString alloc]
initWithFormat:@"%@({ code: '%@', image: '%@' });",
jsCallback,resultText.text,resultImage.image];
//execute
[ webView stringByEvaluatingJavaScriptFromString:retStr ];
[reader dismissModalViewControllerAnimated: YES];
}
Please mark the other answer I provided you as correct also 请把我提供给您的其他答案也标记为正确
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