尝试将随机图像放置到UIButton上

Question

I am very new to Objective-C and programming in general.

The code below is what I have pieced together from various posts.

Simulator builds and launches (yet no image appears on button1).

Trying to place a random image (from 5 images) onto a UIButton .

Code in .m file:

@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];        
}

Any help in the right direction would be great.

Answer 1

Try this:

- (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];
}