ios - 将信息从 View Controller 发送到另一个 View Controller

Question

问题是，我在 View Controller (ViewController)上有9个按钮，并且我有一个 socket 集合用于存储所有这些按钮 socket 。

然后我有一个操作方法来处理这些按钮的点击事件。

我想要的是发送单击按钮的按钮图像背景(作为 UIImage * img)，segue 到另一个 View Controller (vc2)，

这是我的代码:

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *cardBtns;


- (IBAction)cardAction:(id)sender;

@end




#import "ViewController.h"
#import "ResultViewController.h"

@interface ViewController ()
@property(strong,nonatomic)UIImage *image;
@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (IBAction)cardAction:(id)sender {
for(UIButton *cardButton in self.cardBtns){
    self.image = [cardButton currentBackgroundImage];
}
[self performSegueWithIdentifier:@"cardSegue" sender:self.image];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
//UIImage * img = [UIImage imageNamed:@"f1"];
UIImage * img = (UIImage *)sender;

ResultViewController *viewcontroller = [segue destinationViewController];
viewcontroller.img = img;
}

@end

在vc2中，我这里有另一个按钮，我希望用刚从vc1 segue发送的img来绘制这个按钮背景img。

@interface ResultViewController : UIViewController
@property (weak, nonatomic) IBOutlet UIButton *cardBtn;
@property(strong,nonatomic)UIImage *img;

- (IBAction)cardDismiss:(id)sender;

@end



#import "ResultViewController.h"

@interface ResultViewController ()

@end

@implementation ResultViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];
[self.cardBtn setImage:self.img forState:UIControlStateNormal];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}


- (IBAction)cardDismiss:(id)sender {
[self dismissViewControllerAnimated:NO completion:nil];
}
@end

假设我的按钮是 1,2,3,4,5,6,7,8,9

目前，无论我在 vc1 中单击什么按钮，它在 vc2 中始终显示为“6”... 有什么建议么？谢谢

Answer 1

问题是这样的:

- (IBAction)cardAction:(id)sender {
for(UIButton *cardButton in self.cardBtns){
    self.image = [cardButton currentBackgroundImage];
}
[self performSegueWithIdentifier:@"cardSegue" sender:self.image];
}

这会将 self.image 设置为 self.cardBtns 中的最后一项。您想将 self.image 设置为 sender.currentBackgroundImage (并将参数类型中的 id 更改为 UIButton *)，然后消除循环。