ios - 如何在 iOS 8 中创建自定义委托(delegate)？

Question

我已经创建了委托(delegate)方法并在较低版本的 Xcode 中工作，但在 Xcode 6.1 中无法工作。

显示错误Cannot Find protocol declaration NSObject

尝试过的代码:.h文件

@class ReportCell;
@protocol keyboardDelegate <NSObject>

@optional
- (BOOL)leaveKeyboard:(ReportCell *)cell ;

@end


#import <UIKit/UIKit.h>

@interface ReportCell : UITableViewCell
@property (strong, nonatomic) IBOutlet UIImageView *imgReport;
@property (strong, nonatomic) IBOutlet UITextField *txtReport;
@property (strong, nonatomic) IBOutlet UIView *viewReport;
@property (nonatomic, assign) id <keyboardDelegate> delegate;

@end

.m 文件

 #import "ReportCell.h"

    @implementation ReportCell

    - (void)awakeFromNib
    {
        // Initialization code
    }

    - (void)setSelected:(BOOL)selected animated:(BOOL)animated
    {
        [super setSelected:selected animated:animated];

        // Configure the view for the selected state
    }
    - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {

        [_delegate leaveKeyboard:self];
        [self.superview endEditing:YES];
        [super touchesBegan:touches withEvent:event];
    }

Answer 1

嘿，您可以通过更改 .h 文件来解决您的问题。

#import <UIKit/UIKit.h>

@class ReportCell;
@protocol keyboardDelegate;

@interface ReportCell : UITableViewCell
@property (strong, nonatomic) IBOutlet UIImageView *imgReport;
@property (strong, nonatomic) IBOutlet UITextField *txtReport;
@property (strong, nonatomic) IBOutlet UIView *viewReport;
@property (nonatomic, assign) id <keyboardDelegate> delegate;
@end

@protocol keyboardDelegate <NSObject>
@optional
- (BOOL)leaveKeyboard:(ReportCell *)cell ;
@end