与IOS 7一起引入的JavaScriptCore.framework Objective-C API给出了一个糟糕的NSDate转换(BUG？)

对于那些在Objective-C和Javascript之间寻找这个良好集成桥梁的介绍的人,请查看Apple开发者网络上的WWDC介绍“将JavaScript集成到本机应用程序”会话：https://developer.apple.com/wwdc/videos/?id=615.

编辑：WWDC 2013的视频集现已移至：https://developer.apple.com/videos/wwdc/2013/?id=615

我遇到的问题是我的NSDate对象(通过args和直接设置Javascript变量)似乎被严重转换为Javascript日期.这是我的代码：

self.javascriptContext[@"consoleLog"] = ^(NSString *messagE) {
    NSLog(@"Javascript log: %@",messagE);
};
NSDate *myDate = [NSDate date];
NSDateFormatter *dateFormatter = [NSDateFormatter new];
[dateFormatter setDateFormat:@"EEE MMM dd yyyy HH:mm:ss 'GMT'ZZZ"]; // Show in same format as javascript
NSLog(@"myDate = %@",[dateFormatter StringFromDate:myDate]);
self.javascriptContext[@"date1"] = myDate;
[self.javascriptContext evaluateScript:@"var myDateFn = function(dateArg) { consoleLog(\"date1 = \" + date1); consoleLog(\"dateArg = \" + dateArg); return dateArg };"];
JSValue *function = self.javascriptContext[@"myDateFn"];
NSArray *argList = [NSArray arrayWithObjects:myDate,nil];
JSValue *result = [function callWithArguments:argList];
NSDate *javascriptDate = [result toDate];
NSLog(@"javascriptDate = %@",[dateFormatter StringFromDate:javascriptDate]);

其中产生以下日志：

2014-01-24 14:42:08.019 yhere[70180:70b] myDate = Fri Jan 24 2014 14:42:08 GMT+1100
2014-01-24 14:42:08.019 yhere[70180:70b] Javascript log: date1 = Sat Jan 17 1970 13:15:34 GMT+1100 (EST)
2014-01-24 14:42:08.020 yhere[70180:70b] Javascript log: dateArg = Sat Jan 17 1970 13:15:34 GMT+1100 (EST)
2014-01-24 14:42:08.020 yhere[70180:70b] javascriptDate = Fri Jan 24 2014 14:42:08 GMT+1100

请注意Javascript中的日期不同.我已经检查过 – 在Javascript代码中没有出现异常或其他错误(为清楚起见,我没有在此处包含异常处理).

请检查我是否做了一些愚蠢的事情,否则我觉得JavaScriptCore.framework中有一个错误

这几乎就好像框架忘记允许Javascript日期是自1970年以来的毫秒数而不是自1970年以来的秒数[NSDate dateWithTimeIntervalSince1970：]

如果我在传递给Javascript之前强制更大的日期1000x并在退出时除以1000(参见下面的代码),那么日志中的所有日期都是正确的(即相同的日期)：

NSDate *myDate = [NSDate date];
NSDateFormatter *dateFormatter = [NSDateFormatter new];
[dateFormatter setDateFormat:@"EEE MMM dd yyyy HH:mm:ss 'GMT'ZZZ"]; // Show in same format as javascript
NSLog(@"myDate = %@",[dateFormatter StringFromDate:myDate]);
myDate = [NSDate dateWithTimeIntervalSince1970:[myDate timeIntervalSince1970]*1000]; // Workaround BUG
self.javascriptContext[@"date1"] = myDate;
[self.javascriptContext evaluateScript:@"var myDateFn = function(dateArg) { consoleLog(\"date1 = \" + date1); consoleLog(\"dateArg = \" + dateArg); return dateArg };"];
JSValue *function = self.javascriptContext[@"myDateFn"];
NSArray *argList = [NSArray arrayWithObjects:myDate,nil];
JSValue *result = [function callWithArguments:argList];
NSDate *javascriptDate = [result toDate];
javascriptDate = [NSDate dateWithTimeIntervalSince1970:[javascriptDate timeIntervalSince1970]/1000]; // Workaround BUG
NSLog(@"javascriptDate = %@",[dateFormatter StringFromDate:javascriptDate]);

更新日志：

2014-01-24 14:43:44.156 yhere[70180:70b] myDate = Fri Jan 24 2014 14:43:44 GMT+1100
2014-01-24 14:43:44.157 yhere[70180:70b] Javascript log: date1 = Fri Jan 24 2014 14:43:44 GMT+1100 (EST)
2014-01-24 14:43:44.157 yhere[70180:70b] Javascript log: dateArg = Fri Jan 24 2014 14:43:44 GMT+1100 (EST)
2014-01-24 14:43:44.158 yhere[70180:70b] javascriptDate = Fri Jan 24 2014 14:43:44 GMT+1100

我为此提出了一个错误报告(15920754).有谁认为这不是一个错误,我做错了什么？