我无法在CustomCell中使按钮的动作生效

Question

我正在使用UICollectionView并且为“单元”类CustomCell创建了一个实例，在其中实例化了一个按钮。 如果将动作放在“ CustomCell.m ”中， CustomCell.m响应日志并向我写一些内容，但是我需要在包含UICollectionView类中使用动作按钮。

出于这个原因，我使用了这些代表，但尽管如此，我还是没有工作。

我该如何解决？

这是我添加到CustomCell.h的代码：

@class CustomCell;

@protocol CustomCellDelegate
- (void)btnSaveColor:(CustomCell *)sender;
@end

@interface CustomCell : UICollectionViewCell

@property (nonatomic, assign) id delegate;

@property (strong, nonatomic) IBOutlet UILabel *lblCustomCell;
@property (strong, nonatomic) IBOutlet UIView *bgCustomCell;
@property (strong, nonatomic) IBOutlet UILabel *RCustomCell;
@property (strong, nonatomic) IBOutlet UILabel *GCustomCell;
@property (strong, nonatomic) IBOutlet UILabel *BCustomCell;
- (IBAction)btnSaveColor:(id)sender;

@end

这是我添加到CustomCell.m的代码

#import "CustomCell.h"

@implementation CustomCell

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

- (IBAction)btnSaveColor:(CustomCell *)sender {
    [_delegate btnSaveColor:self];
}

@end

这是在ViewController.h中输入的代码

#import <UIKit/UIKit.h>
#import "ViewController.h"
#import "CustomCell.h"

@interface gradientViewController : UIViewController <UICollectionViewDataSource, UICollectionViewDelegate, CustomCellDelegate>

@property (nonatomic, strong) NSString *hexCode;
@property (strong, nonatomic) IBOutlet UILabel *lblDest;
@property (strong, nonatomic) IBOutlet UICollectionView *gradientCollectionView;
@property (strong, nonatomic) NSArray *gradientArray;
@property (strong, nonatomic) NSArray *gradientArrayToWhite;
@property (strong, nonatomic) NSArray *allGradient;

@property (strong, nonatomic) NSArray *reverse;
@property (strong, nonatomic) NSArray *sorted;

@property (strong, nonatomic) IBOutlet UIView *bgHEXColorGradient;
- (IBAction)btnBack:(id)sender;
@property (strong, nonatomic) IBOutlet UIButton *bgBack;

@property (nonatomic, strong) NSArray *ColorSchemeAnalagous;
@property (nonatomic, strong) NSArray *ColorSchemeComplementary;
@property (nonatomic, strong) NSArray *ColorSchemeTriad;

@end

还有这个在ViewController.m中

#import "gradientViewController.h"
#import "ViewController.h"
#import "UIColor+Expanded.h"
#import "CustomCell.h"
#import <QuartzCore/QuartzCore.h>
#import "ColorUtils.h"
#import "MPColorTools.h"
#import "RecipeCollectionHeaderView.h"
#import "UIColor+Colours.h"

@interface gradientViewController ()

@end

@implementation gradientViewController

- (void)btnSaveColor:(CustomCell *)sender {
    NSLog(@"Funziona il delegato!");
}

Answer 1

替换此行代码：

@property (nonatomic, assign) id delegate;

有了这个：

@property (nonatomic, weak) id<CustomCellDelegate> delegate;

我也设置了weak like属性，因为使用assign分配了一个强大的对象，并且在UICollectionView无法释放您的Cell