Question

我有一个项目，显示与其他社交网络类似的状态Feed。每个Feed项都有几个按钮，可以执行不同的操作。其中一个按钮打开一个新的viewcontroller，显示已在特定状态上发布的注释。单击此按钮并打开视图控制器时，我希望它是推送segue，以便它们是后退按钮，用户可以导航回到源。

单击此按钮并启动新vc时，需要将有关所点击的特定状态/单元的一些唯一数据发送到“comments vc”。这样做的代码在哪里？

CUSTOM CELL .H

#import <UIKit/UIKit.h>

@interface FeedItemCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UIImageView *DefaultImg;
@property (weak, nonatomic) IBOutlet UILabel *NameLabel;
@property (weak, nonatomic) IBOutlet UILabel *StatusLabel;
@property (weak, nonatomic) IBOutlet UILabel *timeLabel;


@property (nonatomic, copy) NSString *msg_id;
@property (nonatomic, copy) NSString *status;
@property (nonatomic, weak) IBOutlet UIButton* commentButton;
@property (nonatomic, weak) IBOutlet UIButton* bumpButton;
@property (strong, nonatomic) id delegate;
-(IBAction)viewComments:(id)sender;
-(IBAction)bump:(id)sender;

@end


@protocol CustomCellProtocol <NSObject>
- (void)EBCellPressed:(NSString *)cellName;

CUSTOM CELL .M

#import "FeedItemCell.h"
#import "CommentsViewController.h"
#import "NSDate+TimeAgo.h"


@interface FeedItemCell() <WYPopoverControllerDelegate>
{


}
- (IBAction)open:(id)sender;
- (void)close:(id)sender;
@end


@implementation FeedItemCell
@synthesize commentButton;
- (instancetype)initWithDelegate:(id)delegate {
    self = [super init];
    if (self) {
        self.delegate = delegate;
        // Initialization code
    }
    return self;
}

-(IBAction)bump:(id)sender{

    [self.delegate EBCellPressed:@"NAME"];



}

- (IBAction)open:(id)sender
{

}








@end

publicFeed。中号

#import "PublicFeedViewController.h"
#import "FeedItemCell.h"
#import "AFNetworking.h"
#import "UIImageView+WebCache.h"
#import "InboxDetailViewController.h"
#import "SWRevealViewController.h"
#import "CommentsViewController.h"
#import "NSDate+TimeAgo.h"


@interface PublicFeedViewController (){
    NSArray *NameLabel;
    NSArray *StatusLabel;
    NSMutableArray *feedArray;
}

@end

@implementation PublicFeedViewController

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

- (void)viewDidLoad
{
    [super viewDidLoad];

    //The below code prompts the user for push notifications. If allowed, code in AppDelegate takes over and stores the token.
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
    // Do any additional setup after loading the view.
    self.FeedTable.dataSource=self;
    self.FeedTable.delegate=self;

    // Set the side bar button action. When it's tapped, it'll show up the sidebar.
    _sidebarButton.target = self.revealViewController;
    _sidebarButton.action = @selector(revealToggle:);

    // Set the gesture
    [self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    NSDictionary *parameters = @{@"foo": @"bar"};
    [UIApplication sharedApplication].networkActivityIndicatorVisible = TRUE;
    [manager POST:@"www" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
        //NSLog(@"JSON: %@", responseObject);

        self->feedArray = [responseObject objectForKey:@"feed"];

        [self.FeedTable reloadData];
        [UIApplication sharedApplication].networkActivityIndicatorVisible = FALSE;
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];


}

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

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return feedArray.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{


    NSString *CellIdentifier=@"Cell";

    FeedItemCell *Cell=[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(!Cell){
        Cell = [[FeedItemCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

    }


    NSLog(@"FEED ARRAY: %@", self->feedArray);
    NSDictionary *tempDictionary= [self->feedArray objectAtIndex:indexPath.row];
    // Display recipe in the table cell
    NSString *thumb_img = [tempDictionary objectForKey:@"thumb_img"];
    NSString *thumb_path=@"http://buhzhyve.com/CI_REST_LOGIN/UPLOADS/thumbs/";
    NSString *thumb_url = [thumb_path stringByAppendingString:thumb_img];



    Cell.NameLabel.text=[tempDictionary objectForKey:@"first_name"];
    Cell.StatusLabel.text=[tempDictionary objectForKey:@"message"];
    Cell.msg_id=[tempDictionary objectForKey:@"msg_id"];
    //Cell.status=[tempDictionary objectForKey:@"message"];
    Cell.StatusLabel.lineBreakMode=0;
    Cell.StatusLabel.numberOfLines=0;
    NSString *commentCount = [tempDictionary objectForKey:@"comment_count"];
    NSString *commentButtonText =[NSString stringWithFormat:@"Comments ( %@ )",commentCount];
    [Cell.commentButton setTitle:commentButtonText  forState: UIControlStateNormal];
    NSString *bumpCount = [tempDictionary objectForKey:@"bump_count"];
    NSString *bumpButtonText =[NSString stringWithFormat:@"Bumps ( %@ )",bumpCount];
    [Cell.bumpButton setTitle:bumpButtonText  forState: UIControlStateNormal];
    //[Cell.StatusLabel sizeToFit];
    NSString *created_string=[tempDictionary objectForKey:@"created"];
    double created_double = created_string.doubleValue;
    NSDate *date = [[NSDate alloc] initWithTimeIntervalSince1970:created_double];
    NSString *ago = [date timeAgo];
    Cell.timeLabel.text=ago;




    //Cell.DefaultImg.image = [UIImage imageNamed:@"buhz_mini_logo.png"];

    [Cell.DefaultImg setImageWithURL:[NSURL URLWithString:thumb_url]
                    placeholderImage:[UIImage imageNamed:@"buhz_mini_logo.png"]];
    return Cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //Ideally you should do lazy loading so that instead of creating a new textView each time, you just reuse the same one.
    UITextView *temp = [[UITextView alloc] initWithFrame:CGRectMake(82, 26, self.FeedTable.frame.size.width, 18)]; //This initial size doesn't matter
    NSDictionary *tempDictionary= [self->feedArray objectAtIndex:indexPath.row];
    NSString *status = [tempDictionary objectForKey:@"message"];
    temp.font =[UIFont fontWithName:@"System" size:12];
    temp.text = status;


    CGFloat textViewWidth = 218;
    CGRect tempFrame = CGRectMake(82,26,textViewWidth,18); //The height of this frame doesn't matter.
    CGSize tvsize = [temp sizeThatFits:CGSizeMake(tempFrame.size.width, tempFrame.size.height)]; //This calculates the necessary size so that all the text fits in the necessary width.

    //Add the height of the other UI elements inside your cell

    return tvsize.height + 70;


}

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

    }
}

@end

publicfeed .h

#import <UIKit/UIKit.h>

@interface PublicFeedViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *FeedTable;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *sidebarButton;
- (IBAction)addItem;



@end

Answer 1

因此，假设您在代码中创建了此按钮，这就是您可以处理此问题的方法。

第一行告诉按钮，当按下它时，需要调用此特定选择器/方法作为动作发送。

[button addTarget:self action:@selector(showNextViewController) forControlEvents:UIControlEventTouchUpInside];

然后你会在同一个类中创建这个方法。

- (void) showNextViewController
{
    NewViewController *newViewController = [[NewViewController alloc] init];  //Edit this line of course to fit for your situation.  I'm not sure if you're loading from an XIB or from a Storyboard, or neither.
    newViewController.someVariable = someVariable;
    newViewController.someOtherVariable = someOtherVariable;

    [[[[[UIApplication sharedApplication] delegate] window] rootViewController].navigationController pushViewController:view animated:YES];
}

这会将必要的数据发送到新的视图控制器，并且还会在屏幕上显示带有后退按钮的新视图。

希望这有效！

Answer 2

<强> 1。好的，假设这是你的自定义单元类。在自定义单元格的.h文件中，您需要添加协议。

#import <UIKit/UIKit.h>

@interface CustomCell : UIView
@property (strong, nonatomic) id delegate; //this is used for sending messages out of the custom cell

//init
- (id)initWithFrame:(CGRect)frame andCatName:(NSString *)name andDelegate:(id)delegate;

@end
@protocol CustomCellProtocol <NSObject>

-(void)customCellSelected:(NSString *)cellName;

@end

我们实际上做的是创建一个类可以抛出的自定义事件，订阅它的每个人都可以在抛出customCellSelected时运行一个方法。

<强> 2。现在，当您使用init方法创建每个自定义单元格时，您需要提供一个委托，哪个类应该由自定义单元格将调用传递给customCellSelected，因此在init方法中设置该委托

- (id)initWithFrame:(CGRect)frame andDelegate:(id)delegate {
    self = [super initWithFrame:frame];
    if (self) {
        self.delegate = delegate; //setting which class should be called when calling protocol methods.
        // Your initialization code
    }
    return self;
}

第3。现在在自定义单元格的.m文件中，当用户按下您的按钮并输入您的方法时，请将其设为buttonPressed

- (IBAction) buttonPressed:(id)sender {
    [self.delegate customCellSelected:@"THE CELL'S NAME"]; // calling the protocol method.
}

现在对委托方法的调用应该转移到vc，因为当你创建自定义单元格时，你使用initWithFrame:(CGRect)frame andDelegate:(id)delegate并转移self作为委托，所以当[self.delegate customCellSelected:@"THE CELL'S NAME"];是叫它实际上是在vc上调用的。

<强> 4。这是您在vc中创建自定义单元格的方式：

customCell *tempView = [[customCell alloc] initWithFrame:CGRectMake(X, Y, Width, Height) andDelegate:self]; // here you set the vc as the delegate

5.现在您要做的就是将方法customCellSelected添加到您的vc代码中，以便在customCell调用它时调用它。

- (void)customCellSelected:(NSString *)cellName {
    self.selectedCell = cellName;
    [self performSegueWithIdentifier:@"SelectedCell" sender:self];
}

6.然后在vc中添加：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"SelectedCell"]) {
        LevelSelectViewController *levelSelectViewController = (LevelSelectViewController *)segue.destinationViewController;
        levelSelectViewController.cellName = self.selectedCell;
    }
}

7.你必须要记住的事情就是从第一个vc到第二个vc创建一个segue：

how to create segue

将push segue添加到tableview的自定义单元格内的按钮

2 个答案: