ios - iOS 中，当用户通过 UISwipeGestureRecognizer 在 ImageView 中向左滑动时，如何在 ImageView 中显示 NextImage？

Question

我是 iOS 开发新手。我想在我的应用程序中制作一个应用程序，我制作了一个 UIScrollview，并在此 UIScrollView 中添加了一个 UIImageview。当 viewDidAppear 时，我将 imageview 图像设置为

-(void)viewDidAppear:(BOOL)animated
{
NSDictionary *dict=[self.imagesa objectAtIndex:0];
NSString *imagelink=[dict valueForKey:@"link"];
NSLog(@"imageLink %@",imagelink);
[self.bigImage sd_setImageWithURL:[NSURL URLWithString:imagelink] placeholderImage:[UIImage imageNamed:@"1.png"]];
}

以及为我的 Imageview 和 Scrollvie 添加手势的代码，例如

 UISwipeGestureRecognizer *swipeGestureLeftdirection=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(slideToLeftWithGestureRecognizer:)];
swipeGestureLeftdirection.delegate=self;
swipeGestureLeftdirection.direction=UISwipeGestureRecognizerDirectionLeft;
[self.bigImage addGestureRecognizer:swipeGestureLeftdirection];
[self.bigScrollview addGestureRecognizer:swipeGestureLeftdirection];

 UISwipeGestureRecognizer *swipeGestureRightdirection=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(slideToRighttWithGestureRecognizer:)];
swipeGestureRightdirection.delegate=self;
swipeGestureRightdirection.direction=UISwipeGestureRecognizerDirectionRight;
[self.bigImage addGestureRecognizer:swipeGestureRightdirection];
[self.bigScrollview addGestureRecognizer:swipeGestureRightdirection];

这里的 Self.bigimage 是我的 UIImageview，self.bigScrollview 是我的 UIScrollView。现在我想当用户向左滑动时我想要 UIImageview 图像作为 self.imagesa 下一个索引，当向右滑动时我想要 UIImageVIew 图像返回索引图像如何可能。请给我解决方案。

Answer 1

不要在里面使用循环，slideToLeftWithGestureRecognizer:

这样写代码

 -(void)slideToLeftWithGestureRecognizer:(UISwipeGestureRecognizer *)gestureRecognizer 
{ 
     if(index<[self.imagesa count])
     {
         NSDictionary *dict=[self.imagesa objectAtIndex:index];
        NSString *imagelink=[dict valueForKey:@"link"];
        NSLog(@"imageLink %@",imagelink);
       [self.bigImage sd_setImageWithURL:[NSURL URLWithString:imagelink] placeholderImage:        [UIImage imageNamed:@"1.png"]];

    index++;
   }
 }

使索引成为全局变量，在 viewDidLoad 上初始化为 0。

  -(void)slideToRighttWithGestureRecognizer:(UISwipeGestureRecognizer *)gestureRecognizer 
   { 
      if(index>0)
     {
        index--;
        NSDictionary *dict=[self.imagesa objectAtIndex:index];
        NSString *imagelink=[dict valueForKey:@"link"];
        NSLog(@"imageLink %@",imagelink);
       [self.bigImage sd_setImageWithURL:[NSURL URLWithString:imagelink] placeholderImage:        [UIImage imageNamed:@"1.png"]];


    }
 }