Question

所以我想创建一个视图，你可以从左到右滑动图像。我已经能够弹出一个空白页面显示我的标题并识别滑动手势（左或右）并根据需要对indexToShow进行icnreasing。但是，我无法看到任何图像只是一个空白屏幕。任何帮助将不胜感激。

这就是我所做的：

<。>文件中的

UIImageView *myImageView;
int indexToShow;

<。>文件中的

@interface myController ()
@property (nonatomic, strong) NSMutableArray *imgArray;
@end
@implementation myController
@synthesize imgArray;

然后我

- (void)viewDidLoad
{

[super viewDidLoad];
imgArray = [[NSMutableArray alloc] initWithObjects:@"image1.png",@"image2.png",@"image3.png",@"image4.png", nil];
indexToShow = 0;
UISwipeGestureRecognizer *gestureRight;
UISwipeGestureRecognizer *gestureLeft;
gestureRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self      action:@selector(swipeRight:)];
gestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeft:)];
[gestureLeft setDirection:(UISwipeGestureRecognizerDirectionLeft)];
[[self view] addGestureRecognizer:gestureRight];
[[self view] addGestureRecognizer:gestureLeft];
myImageView.image = [imgArray objectAtIndex:indexToShow];
}

- (void)swipeRight:(UISwipeGestureRecognizer *)gesture
{
if ((gesture.state == UIGestureRecognizerStateChanged) ||
    (gesture.state == UIGestureRecognizerStateEnded)) {

    if ((indexToShow-1) < -1) {
        indexToShow = imgArray.count-1;
    }
    myImageView.image = [imgArray objectAtIndex:indexToShow];
    indexToShow--;
}
}

- (void)swipeLeft:(UISwipeGestureRecognizer *)gesture
{
if ((gesture.state == UIGestureRecognizerStateChanged) ||
    (gesture.state == UIGestureRecognizerStateEnded)) {

    if ((indexToShow+1) > imgArray.count ) {
        indexToShow = 0;
    }
    myImageView.image = [imgArray objectAtIndex:indexToShow];
    indexToShow++;
}
}

然后在我看来，我有

[super viewWillAppear:animated];
self.title = @"Hi";
[self.view addSubview:tutorialImageView];

Answer 1

我建议您使用UICollectionView而不是为了提高效率而执行此操作，但您当前的问题有一个简单的修复。创建数组时，您将其设为字符串数组（文件名）。

imgArray = [[NSMutableArray alloc] initWithObjects:@"image1.png",@"image2.png",@"image3.png",@"image4.png", nil];

但是当您访问它时，您将获取此字符串（文件名）并将其设置为图像视图的图像。

myImageView.image = [imgArray objectAtIndex:indexToShow];

相反，你应该像@Larme建议的那样做，并使用以下

myImageView.image = [UIImage imageName:[imgArray objectAtIndex:indexToShow]];

这将从数组中选定索引处的文件名创建UIImage，并将其设置为图像视图的图像。

可滑动的Imageview

1 个答案: