Question

我想从我的DatePicker中读取值并将其存储在我的单例中，但在尝试执行此操作时会出现异常。

这是单身人士界面：

@interface Helper : NSObject {
NSMutableArray *array;
//Information For Filter page
NSMutableArray *towns;
NSMutableArray *types;
//Shared resources to apply filters
NSDate *toDate;
NSDate *fromDate;
NSString *selectedType;
NSString *selectedTown;
//Shared resource of which button was clicked
int clicked;
int clickedCell;
int clickedContext;
}
@property (nonatomic, retain) NSMutableArray *array;
@property (nonatomic, retain) NSMutableArray *towns;
@property (nonatomic, retain) NSMutableArray *types;
@property (nonatomic) int clicked;
@property (nonatomic) int clickedCell;
@property (nonatomic) int clickedContext;
@property (nonatomic, retain) NSDate *toDate;
@property (nonatomic, retain) NSDate *fromDate;
@property (nonatomic, retain) NSString *selectedType;
@property (nonatomic, retain) NSString *selectedTown;

+(id)sharedManager;


@end

这是发生异常的函数

-(void) viewWillDisappear:(BOOL)animated
{

Helper *myHelper = [Helper sharedManager];
if(myHelper.clickedContext == 0)
{
    if(myHelper.clickedCell == 0)
    {
        //causes exception
        myHelper.fromDate = [self.fromDatePicker date];
    }
    else
    {
        //causes exception
        myHelper.toDate = [self.toDatePicker date];
    }
}
else
{
    if(myHelper.clickedCell == 0)
    {
        myHelper.selectedTown = [myHelper.towns objectAtIndex:[self.townPicker selectedRowInComponent:0]];
    }
    else
    {
        myHelper.selectedType = [myHelper.types objectAtIndex:[self.typePicker selectedRowInComponent:0]];
    }
}
[super viewWillDisappear:animated];   
}

采摘者声明

@property (nonatomic, retain) IBOutlet UIDatePicker *toDatePicker;
@property (nonatomic, retain) IBOutlet UIDatePicker *fromDatePicker;
@property (nonatomic, retain) IBOutlet UIPickerView *typePicker;
@property (nonatomic, retain) IBOutlet UIPickerView *townPicker;

@synthesize part

@synthesize typePicker, toDatePicker, fromDatePicker, townPicker, townsView, toDateView, typesView, fromDateView;

任何想法都是为什么？

由于

Answer 1

如果未在界面构建器中分配插座，则可能会发生这种情况。

如果您认为是，请尝试使用NSZombieEnabled = YES运行该应用，看看是否收到任何错误消息。

Answer 2

我发现了问题。在我的帮助班里，我应该分配不保留。所以应该是

@property (nonatomic, assign) NSDate *toDate;
@property (nonatomic, assign) NSDate *fromDate;

访问UIDatePicker时的EXC_BAD_ACCESS

2 个答案: