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问如何设置按钮的索引路径？
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Stack Overflow用户

提问于 2016-06-10 20:29:21

回答 3查看 583关注 0票数 0

使用下面的代码，我试图获得视频点赞计数，我正在获得数组中的计数，我想将其设置为一个按钮标题，所有工作正常。

我有一个按钮动作，有了这个按钮，我就能显示出这个按钮上的点赞了。但我的问题是，使用这段代码，我在表视图中的所有剪辑中都得到了相同的like count，所以我想要获得各自点击like按钮的特定like count，我该怎么做呢？

// here is how i am getting like count   

- (void)getcat
{
     NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"ClipTable"];
     NSEntityDescription *entity = [NSEntityDescription entityForName:@"ClipTable" inManagedObjectContext:self.managedObjectContext];

     fetchRequest.resultType = NSDictionaryResultType;
     fetchRequest.propertiesToFetch = [NSArray arrayWithObject:[[entity propertiesByName] objectForKey:@"total_likes"]];
     fetchRequest.returnsDistinctResults = YES;

     NSArray *dictionaries = [self.managedObjectContext executeFetchRequest:fetchRequest error:nil];
     NSLog (@"total_likes: %@",dictionaries);

     [NSString stringWithFormat:@"%@",[dictionaries valueForKey:@"total_likes"]];

     self.devices =[[NSMutableArray alloc]init];
     self.devices=[dictionaries mutableCopy];
     NSLog(@"cat1  is%@",self.devices);
}

这就是我显示的点数按钮

- (IBAction)likeButtonAction:(id)sender
 {
     NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[sender tag] inSection:0];
     NSManagedObject *managedObject = [self.devices objectAtIndex:indexPath.row];
     NSString *likes = [NSString stringWithFormat:@"%@",[managedObject valueForKey:@"total_likes"]];
     [sender setTitle:likes forState:UIControlStateNormal];
  }

cellForRowAtIndexPath的代码如下此代码不包含我的任何按钮代码按钮操作likeButtonTapped是单独的

    - (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
// Fetch Record
NSManagedObject *record = [self.fetchedResultsController objectAtIndexPath:indexPath];

     //this button is different one 

 UIButton *btn=[[UIButton alloc]initWithFrame:CGRectMake(208,96, 100, 30)];
[btn addTarget:self action:@selector(yourButtonClicked:) forControlEvents:UIControlEventTouchUpInside];     btn.tag = indexPath.row;
[btn setImage:[UIImage imageNamed:@"btn-details.png"] forState:UIControlStateNormal];
[cell.contentView addSubview:btn];

NSLog(@"sender.tag cell is%ld ",(long)btn.tag);

   }

  see my debugger output
  indexpath is0
  2016-06-10 19:20:31.435 freejournlaist[4159:134867] indexpath is4
  2016-06-10 19:20:31.436 freejournlaist[4159:134867] sender.tag cell is4 
  2016-06-10 19:20:33.351 freejournlaist[4159:134867] indexpath is5
  2016-06-10 19:20:33.352 freejournlaist[4159:134867] sender.tag cell is5 
  2016-06-10 19:20:34.140 freejournlaist[4159:134867] indexpath is6
  2016-06-10 19:20:34.141 freejournlaist[4159:134867] sender.tag cell is6 
 2016-06-10 19:20:35.506 freejournlaist[4159:134867] indexpath is7
 2016-06-10 19:20:35.507 freejournlaist[4159:134867] sender.tag cell is7  
 2016-06-10 19:20:35.888 freejournlaist[4159:134867] indexpath is8
 2016-06-10 19:20:35.889 freejournlaist[4159:134867] sender.tag cell is8 
 2016-06-10 19:20:36.139 freejournlaist[4159:134867] indexpath is9
 2016-06-10 19:20:36.140 freejournlaist[4159:134867] sender.tag cell is9 
 2016-06-10 19:20:36.475 freejournlaist[4159:134867] indexpath is10
 2016-06-10 19:20:36.476 freejournlaist[4159:134867] sender.tag cell is10 
 2016-06-10 19:20:38.201 freejournlaist[4159:134867] indexpath is6
 2016-06-10 19:20:38.202 freejournlaist[4159:134867] sender.tag cell is6 
 2016-06-10 19:20:38.701 freejournlaist[4159:134867] indexpath is5
 2016-06-10 19:20:38.702 freejournlaist[4159:134867] sender.tag cell is5 
 2016-06-10 19:20:39.267 freejournlaist[4159:134867] indexpath is4
 2016-06-10 19:20:39.268 freejournlaist[4159:134867] sender.tag cell is4 
 2016-06-10 19:20:40.684 freejournlaist[4159:134867] indexpath is3
 2016-06-10 19:20:40.685 freejournlaist[4159:134867] sender.tag cell is3 
 2016-06-10 19:20:40.837 freejournlaist[4159:134867] indexpath is2
 2016-06-10 19:20:40.839 freejournlaist[4159:134867] sender.tag cell is2 
 2016-06-10 19:20:41.152 freejournlaist[4159:134867] indexpath is1
 2016-06-10 19:20:41.153 freejournlaist[4159:134867] sender.tag cell is1 
 2016-06-10 19:20:41.952 freejournlaist[4159:134867] indexpath is0
 2016-06-10 19:20:41.954 freejournlaist[4159:134867] sender.tag cell is0 
 2016-06-10 19:21:02.915 freejournlaist[4159:134867] indexpath is3
 2016-06-10 19:21:02.916 freejournlaist[4159:134867] sender.tag cell is3 

 2016-06-10 19:55:38.055 freejournlaist[4326:144151] total_likes: (
            {
            "total_likes" = 1;
            },
            {
            "total_likes" = 5;
            },
            {
    "total_likes" = 2;
    },
    {
    "total_likes" = 0;
     },
    {
    "total_likes" = 4;
     },
    {
    "total_likes" = 3;
    },
    {
    "total_likes" = 6;
     },
    {
    "total_likes" = 115;
     }
     )
   2016-06-10 19:55:38.055 freejournlaist[4326:144151] cat1  is(
    {
    "total_likes" = 1;
    },
    {
    "total_likes" = 5;
    },
     {
    "total_likes" = 2;
   },
    {
    "total_likes" = 0;
   },
     {
    "total_likes" = 4;
   },
    {
    "total_likes" = 3;
   },
    {
    "total_likes" = 6;
    },
    {
    "total_likes" = 115;
    }

ios

objective-c

uitableview

storyboard

tableview

回答 3

Stack Overflow用户

发布于 2016-06-10 20:41:12

您可能忘记了为每个按钮设置一个tag。

您可以通过编程或使用故事板来设置tag

编辑

完整代码：

- (void)getcat{

    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"ClipTable"];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"ClipTable" inManagedObjectContext:self.managedObjectContext];

    fetchRequest.resultType = NSDictionaryResultType;
    fetchRequest.propertiesToFetch = [NSArray arrayWithObject:[[entity propertiesByName] objectForKey:@"total_likes"]];
    fetchRequest.returnsDistinctResults = YES;

    NSArray *dictionaries = [self.managedObjectContext executeFetchRequest:fetchRequest error:nil];
    NSLog(@"total_likes: %@",dictionaries);

    self.devices = [dictionaries mutableCopy];
    NSLog(@"cat1  is%@", self.devices);
}

- (IBAction)likeButtonAction:(id)sender {

    NSManagedObject *managedObject = [self.devices objectAtIndex:sender.tag];

    NSString *likes = [NSString stringWithFormat:@"%@", [managedObject valueForKey:@"total_likes"]];

    [sender setTitle:likes forState:UIControlStateNormal];
}

票数 0

Stack Overflow用户

发布于 2016-06-10 20:42:31

如果你正在做下面的事情，那么应该没有问题..

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    /* - - - - */
    /* - - - - */

    [cell.yourButton setTag:indexPath.row];

    /* - - - - */
    /* - - - - */
}

获取按钮索引的其他替代方法是：

-(IBAction)likeButtonAction:(id)sender
{
    CGPoint buttonPosition  = [sender convertPoint:CGPointZero toView:yourTable];
    NSIndexPath *indexPath  = [yourTable indexPathForRowAtPoint:buttonPosition];
    NSInteger rowIndex      = indexPath.row;

    // Use this index path
}

如果使用tag进行转换，请将sender转换为UIButton对象，如下所示：

-(IBAction)likeButtonAction:(id)sender
{    
    UIButton *button = (UIButton *)sender;
    NSLog(@"%d", button.tag);

    /* - - - - */
    /* - - - - */
}

票数 0

Stack Overflow用户

发布于 2016-06-10 21:43:32

我写了一个简单的示例，就像你写的一样，它是有效的。

这是快照，代码流动，你可以看到按钮文字将在胶带后设置

代码：

- (void)viewDidLoad {
    [super viewDidLoad];

    self.managedObjectContext = ((AppDelegate *)[UIApplication sharedApplication].delegate).managedObjectContext;
    [self getcat];
}

- (void)getcat {
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"ClipTable"];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"ClipTable" inManagedObjectContext:self.managedObjectContext];

    fetchRequest.resultType = NSDictionaryResultType;
    fetchRequest.propertiesToFetch = [NSArray arrayWithObject:[[entity propertiesByName] objectForKey:@"total_likes"]];
    fetchRequest.returnsDistinctResults = YES;

    NSArray *dictionaries = [self.managedObjectContext executeFetchRequest:fetchRequest error:nil];
    NSLog (@"total_likes: %@",dictionaries);

    [NSString stringWithFormat:@"%@",[dictionaries valueForKey:@"total_likes"]];

    self.devices =[[NSMutableArray alloc]init];
    self.devices=[dictionaries mutableCopy];
    NSLog(@"cat1  is%@",self.devices);
}

- (IBAction)likeButtonAction:(UIButton *)sender {
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[sender tag] inSection:0];
    NSManagedObject *managedObject = [self.devices objectAtIndex:indexPath.row];
    NSString *likes = [NSString stringWithFormat:@"%@",[managedObject valueForKey:@"total_likes"]];
    [sender setTitle:likes forState:UIControlStateNormal];
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.devices.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseid" forIndexPath:indexPath];

    // Configure the cell...
    NSArray *subviews = cell.contentView.subviews;
    for (UIView *subview in subviews) {
        if ([subview isKindOfClass:[UIButton class]]) {
            ((UIButton *)subview).tag = indexPath.row;
        } else if ([subview isKindOfClass:[UILabel class]]) {
            NSManagedObject *managedObject = [self.devices objectAtIndex:indexPath.row];
            NSString *likes = [NSString stringWithFormat:@"%@",[managedObject valueForKey:@"total_likes"]];
            ((UILabel *)subview).text = likes;
        }
    }

    return cell;
}

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/37748333

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