Question

我有五张图片，它们被命名为1.jpg 2.jpg 3.jpg 4.jpg 5.jpg，当我的手指在ipad的屏幕上移动时（从右到左），UIImageView将显示来自的图像1.jpg到5.jpg，再从1.jpg到5.jpg，循环，直到我的手指触摸结束，如果我的手指从左向右移动，UIImageView将显示从5.jpg到1.jpg的图像，循环也。我使用以下代码

int currentTag = 1;
NSArray* pages;

-(void)viewDidLoad{
    [super viewDidLoad];

    UISwipeGestureRecognizer *recognizer; 

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; 
[recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)]; 
[[self view] addGestureRecognizer:recognizer]; 
[recognizer release]; 

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; 
[recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)]; 
[[self view] addGestureRecognizer:recognizer]; 
[recognizer release]; 

pages=[[NSArray alloc] initWithObjects:@"1.jpg",@"2.jpg",@"3.jpg",@"4.jpg",@"5.jpg",nil];
}

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer { 

if (recognizer.direction==UISwipeGestureRecognizerDirectionLeft) 
    { 
    if (currentTag<[pages count]) {
                    [imgview setImage:[UIImage imageNamed:[pages objectAtIndex:currentTag]]];  
                    [imgview setUserInteractionEnabled:YES]; 
                    imgview.tag=currentTag;
                    currentTag++;
            }
    }
  }

但它不起作用。那么正确的做法是什么？谢谢

Answer 1

似乎您正在将uemageRecognizer添加到UIImageView的superView中，但您也正在使用它[imgview setUserInteractionEnabled：YES] ;.评论此行和您的代码应该有效。因为当你设置[imgview setUserInteractionEnabled：YES];然后所有的触摸都将由UIImageView处理，我假设你的ImageView的大小等于视图的大小。

关于touchmoved功能

1 个答案: