Question

我有4 UIButtons我希望以随机顺序将浅色图像闪烁一秒钟。显然我想以编程方式更改按钮图像。正如您在 XCode Project方法中看到的那样：showSequence，它会尝试将图像设置为较浅的图像，然后再将图像重新设置，但它不会在模拟器上显示。

代码段：

- (void) showSequence:(NSMutableArray *)sequenceArray {

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

        int sequenceNumber = [[sequenceArray objectAtIndex:i] intValue];

        switch (sequenceNumber) {
           case 1: {
              NSLog(@"green");
              [self.greenButton setBackgroundImage:[UIImage imageNamed:@"green_active.png"] forState:UIControlStateNormal];
              sleep(1);
              [self.greenButton setBackgroundImage:[UIImage imageNamed:@"green_inactive.png"] forState:UIControlStateNormal];
              break;
           }

           case 2: {
              NSLog(@"red");
              [self.redButton setBackgroundImage:[UIImage imageNamed:@"red_active.png"] forState:UIControlStateNormal];
              sleep(1);
              [self.redButton setBackgroundImage:[UIImage imageNamed:@"red_inactive.png"] forState:UIControlStateNormal];
              break;
           }

          case 3: {
             NSLog(@"yellow");
             [self.yellowButton setBackgroundImage:[UIImage imageNamed:@"yellow_active.png"] forState:UIControlStateNormal];
             sleep(1);
             [self.yellowButton setBackgroundImage:[UIImage imageNamed:@"yellow_inactive.png"] forState:UIControlStateNormal];
             break;
          }

          case 4: {
             NSLog(@"blue");
             [self.blueButton setBackgroundImage:[UIImage imageNamed:@"blue_active.png"] forState:UIControlStateNormal];
             sleep(1);
             [self.blueButton setBackgroundImage:[UIImage imageNamed:@"blue_inactive.png"] forState:UIControlStateNormal];
             break;
        }

        default:
            break;
       }
    }
}

提前致谢（顺便说一下，在序列中不要点击开始按钮它会破坏（我还在继续工作））

Answer 1

你可以通过简单地将imageView添加到Button＆amp; amp;将NSArray指定给imageView.animationImages属性。 NSArray必须按照您的顺序包含图像见下面的代码

 imageView.animationImages = [NSArray arrayWithObjects:    
                                        [UIImage imageNamed:@"myImageFrame1.gif"],
                                        [UIImage imageNamed:@"myImageFrame2.gif"],
                                        [UIImage imageNamed:@"myImageFrame3.gif"],
                                        [UIImage imageNamed:@"myImageFrame4.gif"], nil];


        imageView.animationDuration = 2.0; 
        imageView.animationRepeatCount = 1; // for showing only once, otherwise set to 0
        [imageView startAnimating]; 
[self.button addsubView:imageView]

Answer 2

检查

图片已正确添加和命名
查看是否在按钮上添加了图像，然后无法看到背景图像。
IBoutlets已连接
而不是setBackgroundImage:尝试setImage:

UIButton图像没有变化

2 个答案: