目标：实现通过手势进行图片的切换 通过左扫右扫 来实现（纯代码）
添加三个属性 1uiImageView 用来显示图片的view
2 index 用来表示图片的索引
3 ISLeft 判断是不是向左滑
下边是详细的代码：
- (void)viewDidLoad {
[super viewDidLoad];
self.index = 0;
self.ISLeft = YES;
_imageView = [[UIImageView alloc]initWithFrame:self.view.frame];
// _imageView.backgroundColor = [UIColor redColor];
_imageView.contentMode = UIViewContentModeScaleAspectFit;//合适的大小
self.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%ld.png",_index]];
[self.view addSubview:_imageView];
//用户交互设置
self.imageView.userInteractionEnabled = YES;
//添加扫动得手势
UISwipeGestureRecognizer *swipL = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swip:)];
swipL.direction = UISwipeGestureRecognizerDirectionLeft;
[self.imageView addGestureRecognizer:swipL];
UISwipeGestureRecognizer *swipR = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swip:)];
swipR.direction = UISwipeGestureRecognizerDirectionRight;
[self.imageView addGestureRecognizer:swipR];
}
设置转场动画 ：在手势里边进行实现
手势的实现以及转场动画：
-(void)swip:(UISwipeGestureRecognizer *)sender
{
if(sender.direction == UISwipeGestureRecognizerDirectionLeft)
{
if(self.index>=0)
{
if(self.index>0)
{
self.index--;
}
else
{
self.index =3;
}
self.ISLeft = YES;
}
}
else
{
self.ISLeft = NO;
if(self.index<3)
{
self.index++;
if(self.index ==3)
{
self.index =0;
}
}
}
//转场动画
CATransition *trans = [[CATransition alloc]init];
//转场动画的类型
trans.type =@"push";
//判断是不是向左滑
if(self.ISLeft)
{
trans.subtype = kCATransitionFromTop;
}
else
{
trans.subtype = kCATransitionFromBottom;
}
trans.duration = 0.5f;
[self.imageView.layer addAnimation:trans forKey:@"trans"];
//切换图画
self.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%ld",_index]];
}