Question

我将10个图像存储在数组中，如下所示。

 images=[[NSMutableArray alloc]initWithObjects:[UIImage imageNamed:@"Navarre-Family-Eye-Care-Navarre-Florida-Optometrist-Santa-Christmas-Toy-Safety.jpg"],[UIImage imageNamed:@"Christmas-Wallpapers-HD-Picture.jpg"],[UIImage imageNamed:@"Christmas-Wallpaper-jesus-9413550-1024-768.jpg"],[UIImage imageNamed:@"tree.jpg"],[UIImage imageNamed:@"luxury-christmas-napkins-father-christmas-1635-p.jpg"],[UIImage imageNamed:@"Navarre-Family-Eye-Care-Navarre-Florida-Optometrist-Santa-Christmas-Toy-Safety.jpg"],[UIImage imageNamed:@"Christmas-Wallpapers-HD-Picture.jpg"],[UIImage imageNamed:@"Christmas-Wallpaper-jesus-9413550-1024-768.jpg"],[UIImage imageNamed:@"tree.jpg"],[UIImage imageNamed:@"luxury-christmas-napkins-father-christmas-1635-p.jpg"], nil];

<。>文件中的

NSMutableArray *images;

因为我在数组中存储了10个图像。从这里我需要选择随机的6个图像并需要在UIImageView中显示。

在UIViewController中，我已经放置了6个UIImageView和连接，如下所示。

@property(weak,nonatomic)IBOutlet UIImageView *b1;
@property(weak,nonatomic)IBOutlet UIImageView *b2;
@property(weak,nonatomic)IBOutlet UIImageView  *b3;
@property(weak,nonatomic)IBOutlet UIImageView *b4;
@property(weak,nonatomic)IBOutlet UIImageView  *b5;
@property(weak,nonatomic)IBOutlet UIImageView  *b6;

那该怎么办？

Answer 1

简单解决方案，试试这个

NSUInteger randomIndexValue = arc4random() % [images count];

Answer 2

你需要先找到数组的随机索引。然后你可以访问索引数据。这里我是swift的示例代码。

let randomIndex = arc4random() % 10
let image = imageArray[randomIndex]

现在您可以将图像用于imageview。希望你能把它转换成目标c。

Answer 3

-(NSMutableArray*)getRandomValueFromArray:(NSMutableArray*)arrAllData randomDataCount:(NSInteger)count {  
 NSMutableArray *arrFilterData = [[NSMutableArray alloc]init];
for(int i=0; i<count; i++){

 NSInteger index = arc4random() % (NSUInteger)(yourArray.count);
[arrFilterData addObject:[arrAllData objectAtIndex:index]];
[yourArray removeObjectAtIndex:index];
}
return arrFilterData;
}

自己计算。

Answer 4

实际上你有两次5张图片，所以你的imageViews至少要有一倍。

static NSArray *imagenames = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    imagenames = @[
        @"Navarre-Family-Eye-Care-Navarre-Florida-Optometrist-Santa-Christmas-Toy-Safety.jpg",
        @"Christmas-Wallpapers-HD-Picture.jpg",
        @"Christmas-Wallpaper-jesus-9413550-1024-768.jpg",
        @"tree.jpg",
        @"luxury-christmas-napkins-father-christmas-1635-p.jpg",
        @"Navarre-Family-Eye-Care-Navarre-Florida-Optometrist-Santa-Christmas-Toy-Safety.jpg",
        @"Christmas-Wallpapers-HD-Picture.jpg",
        @"Christmas-Wallpaper-jesus-9413550-1024-768.jpg",
        @"tree.jpg",
        @"luxury-christmas-napkins-father-christmas-1635-p.jpg"];
});

NSArray<UIImageView *> *imageViews = @[self.b1, self.b2, self.b3, self.b4, self.b5, self.b6];
NSMutableArray * tmpnames = imagenames.mutableCopy;
for (UIImageView *imageView in imageViews) {
    NSUInteger randomIndex = arc4random_uniform((uint32_t)tmpnames.count);
    imageView.image = [UIImage imageNamed:tmpnames[randomIndex]];
    [tmpnames removeObjectAtIndex:randomIndex];
}

如何使用UIImageView从数组中选择随机图像

4 个答案: