iphone - 如何在 UIDatePicker 中指定时区

Question

- (IBAction) buttonPressed {
NSDate *selected = [datePicker date];
NSString *message = [[NSString alloc] initWithFormat:@"The date and time you selected is: %@", selected];
UIAlertView *alert = [[UIAlertView alloc]
                      initWithTitle:@"Date and Time Selected" message:message delegate:nil cancelButtonTitle:@"Yes, I did!" otherButtonTitles:nil];
[alert show];
[alert release];
[message release];

所以我的下一个问题是...如何在 Objective C 中使用 Datepicker 指定时区？现在，如果我从 DatePicker 中选择一些值并按下显示警报的按钮 - 时间是错误的。这可能是因为时区不正确，但我不确定。那么任何想法都会很棒。在下图中，您可以看到我选择了下午 2:14(14:14)，但更改后说现在是 11:14，时区是 +000

更新 1我已经对我的代码添加了一些更改，但仍然没有...

- (IBAction) buttonPressed {
NSDate *selected = [datePicker date];       
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    
NSTimeZone *tz = [NSTimeZone systemTimeZone];
[dateFormatter setTimeZone:tz];
NSString *formattedDate = [dateFormatter stringFromDate:selected];
NSString *message = [[NSString alloc] initWithFormat:@"The date and time you selected is: %@", formattedDate];
UIAlertView *alert = [[UIAlertView alloc]
                      initWithTitle:@"Date and Time Selected" 
                      message:message delegate:nil cancelButtonTitle:@"Yes, I did!" otherButtonTitles:nil];
[alert show];
[alert release];
[message release];
[dateFormatter release];

Answer 1

在定义日期选择器的地方使用它

datePicker.timeZone = [NSTimeZone localTimeZone];