以下代码在XCode 3.2.2,iPhone OS 3.1.3中创建一个UIActionSheet。嵌入到操作表中的是日期选择器。iOS4创建两个UIActionSheets,3.1.3创建一个?为什么?
但似乎在XCode 3.2.3,iOS4中创建了两张纸,一张叠在另一张上。
另外,我在控制台收到此错误(同样,只用了XCode 3.2.3,iOS4的):
wait_fences: failed to receive reply: 10004003
你觉得这个问题是什么?
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
if ([textField tag] >0)
{
[self dismissKeyboard];
NSString *dateTitle;
dateFieldNumber = [textField tag];
dateTitle = @"Enter your Birth Date";
NSString *title = @"\n\n\n\n\n\n\n\n\n\n\n\n" ;
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:[NSString stringWithFormat:@"%@%@", title, NSLocalizedString(dateTitle, @"")]
delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"Ok", nil];
[actionSheet showInView:[UIApplication sharedApplication].keyWindow];
UIDatePicker *datePicker2 = [[UIDatePicker alloc] init];
self.datePicker = datePicker2;
[datePicker2 release];
self.datePicker.date = [NSDate date];
[self.datePicker addTarget:self
action:@selector(changeDateInLabel:)
forControlEvents:UIControlEventValueChanged];
self.datePicker.datePickerMode = UIDatePickerModeDate;
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *currentDate = [NSDate date];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:60];
NSDate *maxDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
[comps setYear:-60];
NSDate *minDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
[comps release];
[calendar release];
[self.datePicker setMaximumDate:maxDate];
[self.datePicker setMinimumDate:minDate];
[actionSheet addSubview:self.datePicker];
return NO;
} else {
return YES;
}
}
EDIT
正如下面布赖恩指出,textFieldShouldBeginEditing委托方法正在调用两次。我可以看到没有理由说明为什么IOS4会出现这种情况,而不是早期版本。无论如何,我已经更改了代码,所以有一个BOOL hasDisplayedSheet,最初在viewDidLoad中是NO。然后我用if语句所包围的所述actionsheet创建代码(在该textFieldShouldBeginEditing委托方法),如
if (hasDisplayedSheet == NO) {
// actionsheet code
hasDisplayed = YES
}
和更改hasDiplayedSheet
回NO时,他们点击片按钮。
只是试图排除显而易见的 - 是'textFieldShouldBeginEditing:'被调用两次吗? – Brian 2010-06-30 13:15:15
你说得对。它会调用textFieldShouldBeginEditing两次。我不知道为什么它会在IOS4中做到这一点,而不是在以前的操作系统中。 – cannyboy 2010-06-30 19:44:38