通过 iCarousel 将信息传递给多个 viewController

Posted 2023-03-10

【中文标题】通过 iCarousel 将信息传递给多个 viewController

【英文标题】：Pass info to multiple viewControllers via iCarousel

【发布时间】：2014-02-13 18:51:39

【问题描述】：

我正在尝试实现一个 iCarousel，它会在选择图像时将信息传递给其他两个视图控制器。当 iCarousel 完美加载并过渡到下一个 VC 时，信息不会显示在新 VC 上。

我选择的方法是创建一个 NSObject 文件。我不能简单地将信息从 VC 传递给 VC，因为我有几个 VC 需要这些信息，而且我不希望创建单例或尽可能使用 AppDelegate。

仅供参考：我确实在 UIView 顶部添加了一个点击手势识别器，如果这有什么不同的话，它充当下一个 VC 的 segue。

我已经尝试了所有可能的教程，但似乎无法找出我的问题。我只需要显示一个文本标签和一张图片，这应该很容易。有人可以快速浏览一下我的代码，看看我做错了什么吗？

我的 NSObject 文件：

#import <Foundation/Foundation.h>
@interface Stop : NSObject

@property (nonatomic, strong) NSString *title;
@property (nonatomic, strong) NSString *image;
@end

第一个 ViewController.h（上面有 iCarousel）：

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
#import "iCarousel.h"
#import "DirectionsViewController.h"
#import "Stop.h"

@interface StopsMenuViewController : UIViewController <iCarouselDataSource, iCarouselDelegate>

@property (strong, nonatomic) IBOutlet iCarousel *carousel;
@property (strong, nonatomic) IBOutlet UILabel *titleLabel;

//Title
@property (nonatomic, strong) NSArray *stopTitles;
@property (nonatomic, strong) NSString *stopChosen;

//Image
@property (nonatomic, strong) NSArray *stopImages;
@property (nonatomic, strong) NSString *imageChosen;
@end

第一个 ViewController.m：

#import "StopsMenuViewController.h"

@interface StopsMenuViewController () 
NSMutableArray *allInfo; 
@end

@implementation StopsMenuViewController
@synthesize titleLabel, carousel, stopImages, stopTitles, stopChosen, imageChosen;


- (void)awakeFromNib 
NSString *myPlist = [[NSBundle mainBundle] pathForResource:@"Chinatown" ofType:@"plist"];
NSDictionary *rootDictionary = [[NSDictionary alloc] initWithContentsOfFile:myPlist];

self.stopImages = [rootDictionary objectForKey:@"StopImages"];
self.stopTitles = [rootDictionary objectForKey:@"StopTitles"];


- (void)carouselDidScroll:(iCarousel *)carousel 
[titleLabel setText:[NSString stringWithFormat:@"%@", [self.stopTitles     
objectAtIndex:self.carousel.currentItemIndex]]];


- (void)dealloc 
self.carousel.delegate = nil;
self.carousel.dataSource = nil;


-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
if ([[segue identifier] isEqualToString:@"toDirections"])

DirectionsViewController *dvc = [segue destinationViewController];
int itemId = [self.carousel currentItemIndex];
NSIndexPath *path = [NSIndexPath indexPathForRow:itemId inSection:0];

Stop *current = [allInfo objectAtIndex:path.row];
[dvc setPassInfo:current];



- (void)viewDidLoad 
[super viewDidLoad];
self.carousel.type = iCarouselTypeCoverFlow2;

allInfo = [[NSMutableArray alloc] init];

Stop *info = [[Stop alloc] init];
stopChosen = [NSString stringWithFormat:@"%@", [self.stopTitles objectAtIndex:self.carousel.currentItemIndex]];
[info setTitle:stopChosen];
[allInfo addObject:info];

info = [[Stop alloc] init];
self.imageChosen = [NSString stringWithFormat:@"%@", [self.stopImages     
objectAtIndex:self.carousel.currentItemIndex]];
[info setTitle:self.imageChosen];
[allInfo addObject:info];


- (void)viewDidUnload

[super viewDidUnload];
self.carousel = nil;


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
return YES;


- (NSUInteger)numberOfItemsInCarousel:(iCarousel *)carousel 
return [self.stopImages count];


- (NSUInteger)numberOfVisibleItemsInCarousel:(iCarousel *)carousel 
return 4;


- (UIView *)carousel:(iCarousel *)_carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view 
if (view == nil)

view = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[self.stopImages objectAtIndex:index]]];

return view;


- (void)carousel:(iCarousel *)carousel didSelectItemAtIndex:(NSInteger)index 
DirectionsViewController *dvc = [self.storyboard instantiateViewControllerWithIdentifier:@"dvc"];
[self.navigationController pushViewController:dvc animated:YES];

@end

第二个 ViewController.h：

#import <UIKit/UIKit.h>
#import "Stop.h"

@interface DirectionsViewController : UIViewController

@property (strong, nonatomic) IBOutlet UILabel *titleLabel;
@property (strong, nonatomic) IBOutlet UIImageView *imageBox;

@property (nonatomic, strong) Stop *PassInfo;
@property (nonatomic, strong) NSString *stopTitle;
@property (nonatomic, strong) NSString *myStopTitle;
@end

第二个 ViewController.m：

#import "DirectionsViewController.h"

@interface DirectionsViewController ()
@end

 @implementation DirectionsViewController
 @synthesize PassInfo;

- (void)viewDidLoad 
[super viewDidLoad];

[self.titleLabel setText:[PassInfo title]];

UIImage *image = [UIImage imageNamed:[PassInfo image]];
[self.imageBox setImage:image];


- (void)didReceiveMemoryWarning 
[super didReceiveMemoryWarning];

@end

【参考方案1】：

代替

- (void)carousel:(iCarousel *)carousel didSelectItemAtIndex:(NSInteger)index 
  DirectionsViewController *dvc = [self.storyboard instantiateViewControllerWithIdentifier:@"dvc"];
  [self.navigationController pushViewController:dvc animated:YES];

使用

- (void)carousel:(iCarousel *)carousel didSelectItemAtIndex:(NSInteger)index 
  [self performSegueWithIdentifier:@"toDirections" sender:self];

在您的代码中，您正在实例化第二个视图控制器并呈现它，这与执行 segue 不同。因此不会调用方法- prepareForSegue:sender:。

【讨论】：

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