Question

我创建了一个UIBUtton

editButton = [[UIButton alloc]initWithFrame:CGRectMake(width, -4, 30, 30)];
        [editButton setImage:[UIImage imageNamed:@"DeleteButton.jpg"] forState:UIControlStateNormal];
        [editButton addTarget:self action:@selector(deleteObjectViewImage:) forControlEvents:UIControlEventTouchUpInside];
        editButton.hidden = YES;
        [editButton setTag:tag];
        [backView addSubview:editButton];

但是控制没有跳到它的定义，我检查按钮是否在点击时给出了它的标记值。

-

(void)deleteObjectViewImage
{

    NSInteger index = editButton.tag;
    editButton.hidden = YES;
}

任何人都可以告诉我为什么它不起作用。

Answer 1

[editButton addTarget:self action:@selector(deleteObjectViewImage:) forControlEvents:UIControlEventTouchUpInside];

期望函数deleteObjectViewImage：有一个参数。但是函数定义没有任何。

更新：

-(void)deleteObjectViewImage: (id) sender
    {
    UIButton *clickedButton = (UIButton *) sender;
        NSInteger index = clickedButton.tag;
        editButton.hidden = YES;
    }

并使用

[editButton addTarget:self action:@selector(deleteObjectViewImage:) forControlEvents:UIControlEventTouchUpInside];

Answer 2

在代码中使用此行而不是行（在函数名后删除冒号），

 [editButton addTarget:self action:@selector(deleteObjectViewImage) forControlEvents:UIControlEventTouchUpInside];

Answer 3

要获取Tag Value，您必须在Button Click事件中编写此代码...

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

不要从

中删除冒号

 [editButton addTarget:self action:@selector(deleteObjectViewImage:) forControlEvents:UIControlEventTouchUpInside];

Answer 4

试试这个

editButton = [[UIButton alloc]initWithFrame:CGRectMake(width, -4, 30, 30)];
[editButton setImage:[UIImage imageNamed:@"DeleteButton.jpg"] forState:UIControlStateNormal];
[editButton addTarget:self action:@selector(deleteObjectViewImage:) forControlEvents:UIControlEventTouchUpInside];
editButton.hidden = YES;
[editButton setTag:tag];
[backView addSubview:editButton];


- (void)deleteObjectViewImage:(id)sender
{

    UIButton *button = (UIButton *)sender;
    NSLog(@"Button tag is %d",button.tag);
    button.hidden = YES;
}

单击按钮时无法调用函数

4 个答案: