iOS 6 UIPickerView导致崩溃

Question

我在iOS 6中得到这个异常，并找不到原因。使用此库在表格视图中选取日期： https://github.com/TimCinel/ActionSheetPicker

不确定是否它是过早释放对象的库。

任何帮助，将不胜感激。

谢谢。

Exception Type EXC_BAD_ACCESS Code KERN_INVALID_ADDRESS at 0x5c8372ab 
com.apple.main-thread Crashed 
0 libobjc.A.dylib  objc_msgSend + 29 
1 UIKit -[UIApplication sendAction:to:from:forEvent:] + 72 
2 UIKit -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 30 
3 UIKit -[UIControl sendAction:to:forEvent:] + 44 
4 UIKit -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 502 
5 UIKit -[UIPickerView _sendSelectionChangedForComponent:] + 86 
6 UIKit -[UIPickerTableView _scrollingFinished] + 140 
7 UIKit -[UIScrollView(UIScrollViewInternal) _stopScrollDecelerationNotify:] + 836 
8 UIKit -[UIScrollView(UIScrollViewInternal) _stopScrollingNotify:pin:tramplingDragFlags:] + 460 
9 UIKit -[UIScrollView(UIScrollViewInternal) _stopScrollingNotify:pin:] + 30 
10 UIKit -[UIScrollView(Static) _smoothScrollWithUpdateTime:] + 3362 
11 QuartzCore CA::Display::DisplayLink::dispatch(unsigned long long, unsigned long long) + 160 
12 QuartzCore CA::Display::IOMFBDisplayLink::callback(__IOMobileFramebuffer*, unsigned long long, unsigned long long, unsigned long long, void*) + 64 
13 IOMobileFramebuffer  IOMobileFramebufferVsyncNotifyFunc + 154 
14 IOKit IODispatchCalloutFromCFMessage + 192 

Answer 1

只写了下面的代码

注：日期选择是我的UIDatePicker

-(IBAction)dateClicked:(id)sender 
{ 
    UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:nil 
                 delegate:nil 
              cancelButtonTitle:@"Done" 
             destructiveButtonTitle:nil 
              otherButtonTitles:nil]; 

    // Add the picker 
    datePicker = [[UIDatePicker alloc] init]; 
    datePicker.datePickerMode = UIDatePickerModeDate; 
    [datePicker addTarget:self 
        action:@selector(dateChange:) 
     forControlEvents:UIControlEventValueChanged]; 
    [menu addSubview:datePicker]; 
    [menu showInView:self.view];   
    [menu setBounds:CGRectMake(0,0,320, 516)]; 
    [datePicker setFrame:CGRectMake(0, 85, 320, 216)]; 
    [self currentdate]; 
} 

-(void)currentdate 
{ 
    NSDate* date = [NSDate date]; 

    //Create the dateformatter object 

    NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease]; 

    //Set the required date format 

    [formatter setDateFormat:@"MMMM dd, yyyy"] ; //]@"yyyy-MM-dd HH:MM:SS"]; 

    //Get the string date 

    NSString* str = [formatter stringFromDate:date]; 

    //Set in the lable 
    dateULine.frame=CGRectMake(10, 122,150 , 2); 

    [btnGetDate setTitle:str forState:UIControlStateNormal]; 
} 

- (void)dateChange:(id)sender 
{ 
    NSDate *selected = [datePicker date]; 
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
    [formatter setDateFormat:@"MMMM dd, yyyy"]; 
    NSString *str = [formatter stringFromDate:selected]; 
    dateULine.frame=CGRectMake(10, 122,150 , 2); 
    [btnGetDate setTitle:str forState:UIControlStateNormal]; 
}