Question

我使用for循环创建了五个按钮，效果很好。每当我点击重启按钮创建重复按钮

-(void)buttonCreate {
  for( int i = 0; i < 5; i++ )
  {
    oneBtn1 = [UIButton buttonWithType:UIButtonTypeCustom];
    oneBtn1.frame = CGRectMake(316,i*-5+474,51,50);
    [oneBtn1 setTag:i];
    [oneBtn1 addTarget:self action:@selector(oneButton:) forControlEvents:UIControlEventTouchUpInside];
    [oneBtn1 setImage:[UIImage imageNamed:@"1c.png"] forState:UIControlStateNormal];
    [self.view addSubview:oneBtn1];
  }
}

重启按钮功能：

-(void)restart {
    [self buttonCreate];
}

我试过这个，但它只会删除5个中的一个按钮。

if(oneBtn1 != NULL) {
    [oneBtn1 removeFromSuperview];
    oneBtn1 = nil;
}

问题是：如何删除重复的按钮？

Answer 1

创建一个数组（NSMutableArray *buttonHolderArray）以保存所有五个按钮的出口。

[buttonHolderArray addObject:oneBtn1];

然后您可以根据需要删除/更新按钮。

一旦你不想要任何按钮，就清空阵列本身。除此之外，如果您想要清除视图，只需为所有按钮调用removeFromSuperView

I tried this one but it will remove only one button out of 5.

if(oneBtn1 != NULL) {
    [oneBtn1 removeFromSuperview];
    oneBtn1 = nil;
}

如果要删除所有按钮，则只删除一个按钮

for ( UIButton *button in buttonHolderArray){
      button removeFromSuperView];
}

Answer 2

在再次呼叫重新启动方法

之前使用此功能

for (UIButton *btn in self.view.subviews ) {

        [btn removeFromSuperview];
    }

Answer 3

在点击重启按钮之前，您可以从视图中删除调用方法removeChildViewsWithKindOfClass

的所有按钮

-(void)restart {
    [self.view removeChildViewsWithKindOfClass:[UIButton class]];
    [self buttonCreate];
}

-(void)removeChildViewsWithKindOfClass:(Class)classToRemove{
    if (classToRemove==nil) return;

    for (UIView *v in [self subviews]) {
        if ([v isKindOfClass:classToRemove]) {
            [v removeFromSuperview];
        }
    }
}

如果要删除特定按钮，可以使用创建按钮时必须预先设置的属性tag，并允许您删除带有特定标记的按钮。

Answer 4

您可以通过检查按钮是否已创建来删除。

-(void)buttonCreate {
  int tag_start = 500;
  for( int i = 0; i < 5; i++ )
  {
    UIView * prevbtn = [self.view viewWithTag:tag_start + i];
    if(prevbtn) {
         [prevbtn removeFromSuperview];
    }

    oneBtn1 = [UIButton buttonWithType:UIButtonTypeCustom];
    oneBtn1.frame = CGRectMake(316,i*-5+474,51,50);
    [oneBtn1 setTag:tag_start + i];
    [oneBtn1 addTarget:self action:@selector(oneButton:) forControlEvents:UIControlEventTouchUpInside];
    [oneBtn1 setImage:[UIImage imageNamed:@"1c.png"] forState:UIControlStateNormal];
    [self.view addSubview:oneBtn1];
  }
}

如何删除重复按钮

4 个答案: