iphone NSNumberFormatter 在解析时在模拟器上工作，而不是在设备操作系统 4.2 上工作

Question

这是 Craig Schamp 的一段 terremoto 代码。在模拟器（操作系统 4.2）上运行良好，但在设备上运行不佳。

self.currentEarthquake.magnitude = [formatter numberFromString:magString]; and

NSNumber *latituide = [formatter numberFromString:[comp objectAtIndex:0]];

NSNumber *longitude = [formatter numberFromString:[comp objectAtIndex:1]] 

设备上为空，而模拟器上有所有数据....这里是所有代码....我的设备是 3g 4.2 NSNumberFormatter 是问题吗？？？

if ([elementName isEqualToString:@"title"]) {
  //<title>M 5.8, Banda Sea</title>
  NSArray *components = [self.propertyValue componentsSeparatedByString:@","];
  if (components.count > 1) {
   // strip the M
   NSString *magString = [[[components objectAtIndex:0] componentsSeparatedByString:@" "] objectAtIndex:1];

   NSLog(@"String %@",magString);

   NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
   self.currentEarthquake.magnitude = [formatter numberFromString:magString];
   self.currentEarthquake.place = [components objectAtIndex:1];
   [formatter release];

   NSLog(@"Magnetudine %@",self.currentEarthquake.magnitude);
   NSLog(@"Place %@",self.currentEarthquake.place);

   NSLocale *currentUsersLocale = [NSLocale currentLocale];
   NSLog(@"Current Locale: %@", [currentUsersLocale localeIdentifier]);

  }
 } else if ([elementName isEqualToString:@"updated"]) {
  //<updated>2008-04-29T19:10:01Z</updated>
  NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
  [formatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"];
  self.currentEarthquake.lastUpdate = [formatter dateFromString:self.propertyValue];
  [formatter release];

  NSLog(@"Date %@",self.currentEarthquake.lastUpdate);

 } else if ([elementName isEqualToString:@"georss:point"]) {
  NSArray *comp = [self.propertyValue componentsSeparatedByString:@" "];
  NSLog(@"Comp %@",comp);

  NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];


  NSNumber *latituide = [formatter numberFromString:[comp objectAtIndex:0]];
  NSLog(@"Latitude %@",latituide);
  NSNumber *longitude = [formatter numberFromString:[comp objectAtIndex:1]];
  [formatter release];
  CLLocation *location = [[CLLocation alloc] initWithLatitude:latituide.floatValue
                longitude:longitude.floatValue];
  self.currentEarthquake.location = location;
  [location release];

  NSLog(@"Location %@",location);
 } else if([elementName isEqualToString:@"entry"]) {
  [(id)[self delegate] performSelectorOnMainThread:@selector(addEarthquake:)
             withObject:self.currentEarthquake
             waitUntilDone:NO];
 }

2010-12-05 03:46:45.738 Terremoto[251:307] 比较 ( “41.9022”， “12.4579” ） 2010-12-05 03:46:45.745 Terremoto[251:307] 纬度（空）

2010-12-05 03:46:45.847 Terremoto[251:307] 位置 <+0.00000000, +0.00000000> +/- 0.00m（速度 -1.00 mps / 航向 -1.00）@ 05/12/10 03:46:45 GMT-03:00

2010-12-05 03:46:45.854 Terremoto[251:307] String 5.0

2010 -12-05 03:46:45.864 Terremoto[251:307] Magnetudine (null)

2010-12-05 03:46:45.868 Terremoto[251:307] 埃尔吉夫广场酒店

2010-12-05 03:46:45.871 Terremoto[ 251:307] 当前区域设置： it_IT

2010-12-05 03:46:45.892 Terremoto[251:307] 日期 2010-10-14 14:35:18 +0000

2010-12-05 03:46:45.898 Terremoto[251 :307]比较（ “-6.1020”， “127.5017” )

设备日志

Answer 1

它不起作用的原因很可能是在您的语言环境（意大利语）中，句点“.”。不是有效的小数点分隔符。

调用 -[NSNumberFormatter setDecimalSeparator:] 将其设置为正确的值。

Answer 2

我在相同的上下文中遇到了相同的问题（解析坐标）。我使用的是 iOS 4.3。我使用的 Mac 和 iPad 都设置为德语，因此我认为格式化程序应该以相同的方式运行，但事实并非如此。

我最终使用了这个：

 pi.latitude = [NSNumber numberWithDouble:[(NSString *)[coords objectAtIndex:0] doubleValue]];

它适用于模拟器和设备。