EXC_BAD_ACCESS(代码= 1…当使用NSObject作为委托时

Question

我在。h文件中有以下代码:

#import <UIKit/UIKit.h>
@interface NFModalPickerView : NSObject
@end
@protocol NFModalPickerViewDelegate<NSObject>
@optional
- (void)titleSelected:(NFModalPickerView *) modalPickerView title:(NSString *) title;
@required
- (void)done:(NFModalPickerView *) modalPickerView;
@end
@interface NFModalPickerView()
{
    id <NFModalPickerViewDelegate> delegate;
}
@property (nonatomic, strong) NSMutableArray * objectArray;
@property (nonatomic, strong) id <NFModalPickerViewDelegate> delegate;
- (void) show;
@end

和.m文件中的代码:

#import "NFModalPickerView.h"
@interface NFModalPickerView()<UIPickerViewDelegate,UIPickerViewDataSource>
@end
@implementation NFModalPickerView
@synthesize objectArray;
@synthesize delegate;
UIActionSheet *actionSheet;
UIPickerView *pickerView ;
UISegmentedControl *closeButton;
- (void) show{
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil
                                                             delegate:nil
                                                    cancelButtonTitle:nil
                                               destructiveButtonTitle:nil
                                                    otherButtonTitles:nil];
    [actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
    CGRect pickerFrame = CGRectMake(0, 40, 0, 0);
    pickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];
    pickerView.showsSelectionIndicator = YES;
    pickerView.dataSource = self;
    pickerView.delegate = self;
    [actionSheet addSubview:pickerView];
    pickerView = nil;
    closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Done"]];
    closeButton.momentary = YES;
    closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
    closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
    closeButton.tintColor = [UIColor blackColor];
    [closeButton addTarget:self action:@selector(dismissActionSheet:) forControlEvents:UIControlEventValueChanged];
    [actionSheet addSubview:closeButton];
    closeButton = nil;
    [actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];
    [actionSheet setBounds:CGRectMake(0, 0, 320, 485)];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    return [objectArray count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    return [objectArray objectAtIndex:row];
}
-(void) dismissActionSheet:(id)sender {
    UIActionSheet *actionSheet =  (UIActionSheet *)[(UIView *)sender superview];
    [actionSheet dismissWithClickedButtonIndex:0 animated:YES];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    [[self delegate] titleSelected:self title:[objectArray objectAtIndex:row]];
}
@end

最后这段代码在我的ViewController

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    pickerView = [[NFModalPickerView alloc] init];
    pickerView.objectArray = [[NSMutableArray alloc] init];
    [pickerView.objectArray addObject:@"Don personnel"];
    [pickerView.objectArray addObject:@"Don d'entreprise"];
    [pickerView setDelegate:self];
    [pickerView show];
    return NO;
}

当使用NFModalPickerView作为pickerview的委托时，我总是得到一个糟糕的访问错误。如果我把所有代码放在视图控制器中使用视图控制器作为选择器视图的委托，它会工作得很好。我需要有一个单独的类来重用modalpickerview，而不是总是把所有的代码在我的每个视图控制器。有人能帮我吗?

Answer 1

如果您正在使用ARC, UIPickerView的delegate可能会自动释放。要么使用UIViewController作为dataSource, delegate作为UIPickerView，或者如果你使用一个单独的对象来管理UIPickerView，把它作为一个属性，这样它就不会被释放。