Question

我已经说过例如7 UIButtons，即c1到c7。现在我已经为UIButtons c1到c7分别为1到7分配了标签。

现在，当我选择c2时，它会从superView中删除，所以现在c2的标记为2，转移到c3,3转移到c4，依此类推。

这是我尝试的但是逻辑不能正常工作。我之前发过类似问题的问题，但没有得到任何适当的回应。

-(void)totesttheFunction
{
    for(int i=0; i<7; i++)
    {
        UIButton *testHere = (UIButton*)[self.view viewWithTag:i];
        if([testHere isSelected])
        {
            int backuptagFor = testHere.tag;
            CGFloat diff = 30.0;
            for(int j=i+1; j<7;j++)
            {
                UIButton *btnToReplace = (UIButton*)[self.view viewWithTag:j];
                 CGRect setRect = CGRectMake(btnToReplace.frame.origin.x-diff, btnToReplace.frame.origin.y, btnToReplace.frame.size.width, btnToReplace.frame.size.height);
                btnToReplace.tag = backuptagFor;
                [testHere removeFromSuperview];

            }
        }
    }
}

Answer 1

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

    for(int itemIndex = 1; itemIndex <= 7; itemIndex++)
    {
        UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(itemIndex*40, 10, 30, 30)];
        btn.tag = itemIndex;
        [self.view addSubview:btn];

        if (itemIndex == 3 ||itemIndex == 4)
        {
            [btn setSelected:YES];
        }
    }

    [self testFunction];
}


- (void)testFunction
{
    int totalButtons = 7;
    int totalRemovedButtons = 0;

    for(int itemIndex = 1; itemIndex <= totalButtons; itemIndex++)
    {
        UIButton *testHere = ([[self.view viewWithTag:itemIndex] isKindOfClass:[UIButton class]])?(UIButton *)[self.view viewWithTag:itemIndex]:nil;
        if([testHere isSelected])
        {
            [testHere removeFromSuperview];
            NSLog(@"removed button with tag:%d",itemIndex + totalRemovedButtons);

            for (int tempItemIndx = itemIndex + 1; tempItemIndx <= totalButtons; tempItemIndx++)
            {
                 UIButton *nextButton = ([[self.view viewWithTag:tempItemIndx] isKindOfClass:[UIButton class]])?(UIButton *)[self.view viewWithTag:tempItemIndx]:nil;
                nextButton.tag = tempItemIndx - 1;
            }

           itemIndex--;
           totalRemovedButtons ++;
        }

        NSLog(@"loop run %d",itemIndex);
    }

    NSLog(@"-------------------------------------------------------------------");

    //Checking the updated tags.

    for(int itemIndex = 1; itemIndex <= (totalButtons - totalRemovedButtons); itemIndex++)
    {
        UIButton *testHere = ([[self.view viewWithTag:itemIndex] isKindOfClass:[UIButton class]])?(UIButton *)[self.view viewWithTag:itemIndex]:nil;
        NSLog(@"New tags %d",testHere.tag);
    }
}

<强>输出：

 loop run 1
 loop run 2
 removed button with tag:3
 loop run 2
 removed button with tag:4
 loop run 2
 loop run 3
 loop run 4
 loop run 5
 loop run 6
 loop run 7
 ---------------------
 New tags 1
 New tags 2
 New tags 3
 New tags 4
 New tags 5

Answer 2

首先应用以下方法删除旧用户界面，从头开始重新生成新用户界面再次为其分配相同标签
例如123456 - 删除4 - 12356 - 存储剩余数据 - 从旧数据重新生成新UI 现在12345

- (IBAction)actionDeletePrevEmp:(UIButton *)sender
{

// ********* DELETED OLD UI AND GENERATED DATA FROM OLD UI **********

NSMutableArray *tempArray = [[NSMutableArray alloc]init];

for (int BTNCounter = 1; BTNCounter < 8 ;BTNCounter++)
{
    if (BTNCounter == sender.tag)
    { // do not add contents to array
      // delete it from UI

        [(UIButton *)[self.view viewWithTag:BTNCounter]removeFromSuperview];

        continue;
    }


}


// ************* GENERATING NEW UI WITH TEMP DATA **************


int empSizeCounter = 50;

for (int loopCounter = 0, BTNTagCounter = 1 ; BTNTagCounter < 7; loopCounter++)
{
    viewPreviousEmployerList = [[UIView alloc]initWithFrame:CGRectMake(0.0, empSizeCounter, 320.0, 50.0)];


    //  viewPreviousEmployerList.backgroundColor = [UIColor blackColor];

    deletePrevEmpButton = [UIButton buttonWithType:UIButtonTypeSystem];
    //[deletePrevEmpButton setImage:[UIImage imageNamed:@"checkbox.png"] forState:UIControlStateNormal];

    deletePrevEmpButton = [[UIButton alloc]initWithFrame:CGRectMake(264.0, 10.0, 30.0, 30.0)];
    deletePrevEmpButton.backgroundColor = [UIColor blueColor];
    deletePrevEmpButton.titleLabel.text = @"X";
    deletePrevEmpButton.tag = BTNTagCounter;


    if (loopCounter+1 > [tempArray count])
    {
         btnTemp.text = @"";

                }
    else
    {
        btnTemp.text = tempArray[loopCounter];


    }




    BTNTagCounter++;
    [viewPreviousEmployerList addSubview:btnTemp];

    [self.viewAddEmployer addSubview:viewPreviousEmployerList];

    empSizeCounter = empSizeCounter + 50;


}

Answer 3

首先你需要在NSMutableArray中添加所有按钮并关注我，（此处数组名称为 _myArrayOfBtn ）
添加按钮的方法，例如（并确保每个按钮的方法名称相同）

[myBuutonName addTarget:self action:@selector(totesttheFunction:) forControlEvents:UIControlEventTouchUpInside];

方法声明就像，

-(void) totesttheFunction:(UIButton *)sender
{
    [sender removeFromSuperview]; // just put this code.
    [_myArrayOfBtn removeObjectAtIndex:sender.tag];
    // replace tag of buttons
    for(int i = 1; i < _myArrayOfBtn.count; i ++)
    {
      UIButton *btn = (UIButton *)[_myArrayOfBtn objectAtIndex:i]
      btn.tag = i;
    }

}

无法替换UIButton（s）的标签

3 个答案: