Question

我对Objective-C和编程很新。

以下代码是我从各个帖子拼凑而来的。

模拟器构建和启动（但按钮1上没有图像）。

尝试将随机图像（从5张图像）放到UIButton。

.m文件中的代码：

@property (nonatomic, strong) NSMutableArray* imageArray;

- (void)viewDidLoad
{
    [super viewDidLoad];

    _imageArray =[[NSMutableArray alloc] init];
              [UIImage imageNamed:@"btn1.png"],
              [UIImage imageNamed:@"btn2.png"],
              [UIImage imageNamed:@"btn3.png"],
              [UIImage imageNamed:@"btn4.png"],
              [UIImage imageNamed:@"btn5.png"];

    int index = arc4random() % 5;

    for (int i = 0; i < [_imageArray count]; i++)    
        [_button1 setImage:[UIImage imageNamed:[_imageArray objectAtIndex:index]]    
                  forState:UIControlStateNormal];        
}

任何正确方向的帮助都会很棒。

Answer 1

试试这个：

- (void)viewDidLoad {
    [super viewDidLoad];

    _imageArray =[[NSMutableArray alloc] init];
    [_imageArray addObject:[UIImage imageNamed:@"btn1.png"]] ;
    [_imageArray addObject:[UIImage imageNamed:@"btn2.png"]] ;
    [_imageArray addObject:[UIImage imageNamed:@"btn3.png"]] ;
    [_imageArray addObject:[UIImage imageNamed:@"btn4.png"]] ;
    [_imageArray addObject:[UIImage imageNamed:@"btn5.png"]] ;

    int index = arc4random() % 5;
    [_button1 setImage:[UIImage imageNamed:[_imageArray objectAtIndex:index]] forState:UIControlStateNormal];
}

试图将随机图像放到UIButton上

1 个答案: