iphone - 随机更改 UIButton 背景图片

Question

我想随机更改 UIButton 的背景图片。我有一些图片 (5)，我想将它们随机切换为 UIButton 的背景图片。我该如何实现？请帮我解决这个问题。

Answer 1

这样的事情怎么样

NSInteger randomNumber =  arc4random_uniform(5); // random number, either 0,1,2,3 or 4
UIImage *randomImage = [UIImage imageNamed:[NSString stringWithFormat:@"img%u.png",randomNumber]];

//UIButton *myButton;
[myButton setBackgroundImage:randomImage forState:UIControlStateNormal];

可能更容易理解的替代解决方案

NSInteger randomNumber =  arc4random_uniform(5); // random number, either 0,1,2,3 or 4
UIImage *randomImage;

switch (randomNumber) {
    case 0:
        randomImage = [UIImage imageNamed:@"img0.png"];
        break;
    case 1:
        randomImage = [UIImage imageNamed:@"img1.png"];
        break;
    case 2:
        randomImage = [UIImage imageNamed:@"img2.png"];
        break;
    case 3:
        randomImage = [UIImage imageNamed:@"img3.png"];
        break;
    case 4:
        randomImage = [UIImage imageNamed:@"img4.png"];
        break;
    default:
        break;
}
//UIButton *myButton;
[myButton setBackgroundImage:randomImage forState:UIControlStateNormal];

供将来引用；您不应该在或多或少要求某人为您解决问题的地方提问。包括您尝试过的内容，即使您只有伪代码也是如此。