Question

我正在做一个关于多项选择题（MCQ）的申请，我必须从网络服务中获得问题和答案。我有4个选项的1个问题，在4个选项中，我有1个正确的答案。每个选项，我都以编程方式创建了一个按钮。我就这样做了：

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(40, yButton, 30, 30);
    [button setTitle:@" " forState:UIControlStateNormal];

[button addTarget:self action:@selector(correctPressed)
 forControlEvents:UIControlEventTouchDown];
   [buttonArray addObject:button];

我在问题中有多少选项将决定创建多少个按钮。现在，当我想要显示单击某个按钮时，该按钮需要保持突出显示，直到我决定更改我的答案。我做了一些方法。

我使用IndexPath，希望我可以在indexPath.row中使用TableView。它根本没有用。有人可以帮忙吗？

由于

Answer 1

将此更改为

[button addTarget:self action:@selector(correctPressed)
 forControlEvents:UIControlEventTouchDown];
   [buttonArray addObject:button];

[button addTarget:self action:@selector(correctPressed:)
 forControlEvents:UIControlEventTouchDown];
   [buttonArray addObject:button];

现在在您的选择器中，您将获得对该按钮的引用。

例如。

UIButton * lastButtonPressed = nil;
-(void) correctPressed:(UIButton *) theButton{
   [theButton setHighlighted:YES];
   if(lastButtonPressed) [lastButtonPressed setHighlighted:NO];
   lastButtonPressed =  theButton;

}

**您可能希望将所选方法用于按钮。因此，您可以设置一个按钮。

我刚输入此代码，检查我的@selector更改并且setHighlighted实际上是正确的，但您应该明白这一点。

现在你的代码将调用选择器，它应该有一个对调用按钮的引用。

约翰。

Answer 2

没关系，我解决了这个问题。

我所做的是在代码中的某处button.tag = number; number++。通过使用标记方法，我可以跟踪arrays单击哪个按钮。

-(void)correctAnswer
{
   yButton += 50;
   yLabel += 50;

   label = [[UILabel alloc] initWithFrame:CGRectMake(75, yLabel, 150, 30)];
   label.backgroundColor = [UIColor clearColor];
   [label setText:Option];
   [labelArray addObject:label];
   [self addSubview:label];

   button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
   button.frame = CGRectMake(40, yButton, 30, 30);
   button.tag = idx;
   NSLog(@"-------====== Tag Index is: %i", idx);
   UIImage * btnImage1 = [UIImage imageNamed:@"uncheckedCheckbox.png"];
   [button setImage:btnImage1 forState:UIControlStateNormal];
   [button addTarget:self action:@selector(correctPressed:)
    forControlEvents:UIControlEventTouchUpInside];

   [buttonArray addObject:button];
idx++;
[self addSubview:button];

}


-(void)correctPressed:(id)sender {

int but =  (int)[(UIButton*)sender tag];

if(correctValue) {
    UIImage * btnImage1 = [UIImage imageNamed:@"uncheckedCheckbox.png"];
    UIButton *btn1 = [buttonArray objectAtIndex:but];
    [btn1 setImage:btnImage1 forState:UIControlStateNormal];
    [btn1 setImage:btnImage1 forState:UIControlStateNormal];
    [btn1 setTitle:@"" forState:UIControlStateNormal];
    correctValue = NO;

} else {
    UIImage * btnImage2 = [UIImage imageNamed:@"checkedCheckbox.png"];
    UIButton *btn2 = [buttonArray objectAtIndex:but];
    [btn2 setImage:btnImage2 forState:UIControlStateNormal];
    [btn2 setImage:btnImage2 forState:UIControlStateNormal];
    [btn2 setTitle:@"" forState:UIControlStateNormal];
    correctValue = YES;
} 

NSLog(@"Correct answer!!");    
}

Answer 3

for(int i=0; i<[videolistArray count];i++){


    NSArray *myWords = [[[videolistArray objectAtIndex:i] valueForKey:@"video"] componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"/"]];
    //NSLog(@"%@",[myWords lastObject]);

    UIButton *guitaristButton = [[UIButton alloc]init];
    guitaristButton.frame = CGRectMake(0, ycomp, 300, 35);
    guitaristButton.tag = i;
    [guitaristButton setBackgroundImage:[UIImage imageNamed:@"green-buttons.png"] forState:UIControlStateNormal];
    [guitaristButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [guitaristButton setTitle:[myWords lastObject] forState:UIControlStateNormal];
    [guitaristButton addTarget:self action:@selector(VideoButtonSelected:) forControlEvents:UIControlEventTouchUpInside];
    //[guitaristButton performSelector:<#(SEL)aSelector#> withObject:<#(id)object1#> withObject:<#(id)object2#>
    [videoScrollView addSubview:guitaristButton];
    [guitaristButton release];

    ycomp = ycomp+35;   
}
videoScrollView.contentSize=CGSizeMake(300, ycomp);

} - （无效）VideoButtonSelected：（的UIButton *）发件人{ NSArray * myWords = [[[videolistArray objectAtIndex：sender.tag] valueForKey：@“video”] componentsSeparatedByCharactersInSet：[NSCharacterSet characterSetWithCharactersInString：@“/”]]; // NSLog（@“％@”，[myWords lastObject]）; [setAlarmVedioButton setTitle：[myWords lastObject] forState：UIControlStateNormal]; [videoNameButtonView removeFromSuperview]; vedioString = [[videolistArray objectAtIndex：sender.tag] valueForKey：@“video”]; }

在上面的代码中，我在数组计数的帮助下制作了uibutton，当我选择任何按钮时，它在最后一个按钮上显示数组的相同文本值

如何找到单击以编程方式创建的按钮？

3 个答案: