我無法在CustomCell中使按鈕的動作生效

Question

我正在使用UICollectionView並且為“單元”類CustomCell創建了一個實例，在其中實例化了一個按鈕。 如果將動作放在“ CustomCell.m ”中， CustomCell.m響應日志並向我寫一些內容，但是我需要在包含UICollectionView類中使用動作按鈕。

出於這個原因，我使用了這些代表，但盡管如此，我還是沒有工作。

我該如何解決？

這是我添加到CustomCell.h的代碼：

@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

這是我添加到CustomCell.m的代碼

#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

這是在ViewController.h中輸入的代碼

#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

還有這個在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

替換此行代碼：

@property (nonatomic, assign) id delegate;

有了這個：

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

我也設置了weak like屬性，因為使用assign分配了一個強大的對象，並且在UICollectionView無法釋放您的Cell