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我在 .h 文件中有这段代码：

#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 文件中的这段代码：

#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

最后是我的 ViewController 中的这段代码

- (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;
}

使用 NFModalPickerView 作为选取器视图的代表时，我总是遇到错误的访问错误。如果我将所有代码放在视图控制器中，使用视图控制器作为选取器视图的代表，它工作正常。我需要有一个单独的类来重用 modalpickerview，而不是总是将所有代码放在我的每个视图控制器中。任何人都可以帮助我吗？

4

1 回答 1

0

如果您正在使用ARC， UIPickerViewdelegate可能会自动发布。使用UIViewControllerasdataSource和delegatefor the UIPickerView，或者如果您使用单独的对象来管理UIPickerView，请将其保留为属性，以便它不会被释放。

于 2014-07-31T12:51:33.413 回答