如何一次删除多个UIButton的背景图像？

Question

我在我的应用程序中使用了20个UIButton.我在click事件中设置了所有这些UIButton的背景图像.所有这些UIButton都保存在NSMutableArray中.这是代码.

             saveBtn = [[NSMutableArray alloc] init];
             for (int i=0; i<20; i++) {
             UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
             btn.frame = CGRectMake(spacex, spacey, 30.0, 30.0);
             idx = arc4random()%[arr count];
             NSString* titre1 = [arr objectAtIndex:idx];
             [btn setTitle:titre1 forState:UIControlStateNormal];   
             spacex = spacex + 30;
             [saveBtn addObject:btn];
             [self.view addSubview:btn];
          }

我在这里成功是我的代码.

 UIButton *currentButton = (UIButton *)sender;
 UIImage * imgNormal = [UIImage imageNamed:@"subtabButton.png"];
 [currentButton setBackgroundImage:imgNormal forState:UIControlStateNormal];
 [currentButton setTitle:currentButton.titleLabel.text forState:UIControlStateNormal];

但是在这20个UIButton之间有3个UIButton,我希望当玩家点击这三个UIButton中的一个时,所有之前设置的背景图像都会从UIButtons中移除.任何人都可以指导我们如何做到这一点.提前做好准备.

Answer 1

for (UIButton *btn in yourArrayOfButtons)
{
   [btn setBackgroundImage:[UIImage imageNamed:@"nameofmyimage"] forState:UIControlStateNormal];
}

或者如果你想删除图像:

for (UIButton *btn in yourArrayOfButtons)
{
   [btn setBackgroundImage:nil forState:UIControlStateNormal];
}