2018-04-24 仿微信的图片浏览器实现（一）

本来想通过scroll+手势操作实现的，结果scrollView本身就有很多复杂的手势，所以这个方法失败告终。

#pragma mark - gesture 手势操作
//创建缩放手势
-(void)createPinchGesture{
    for (UIImageView * vw in self.imageViewArr) {
        UIPinchGestureRecognizer *pinchGes  =[[UIPinchGestureRecognizer alloc]init];
        pinchGes.delegate = self;
        [pinchGes addTarget:self action:@selector(pinchGes:)];
        [vw addGestureRecognizer:pinchGes];
    }
}
-(void)pinchGes:(UIPinchGestureRecognizer *)ges{
    //比列
    CGFloat scale = ges.scale;
    //改变视图比列
    ges.view.transform = CGAffineTransformScale(ges.view.transform, scale, scale);
    //比列为1
    ges.scale = 1;
}
//创建旋转手势
-(void)createRotataeGesture{
    for (UIImageView * vw in self.imageViewArr) {
        UIRotationGestureRecognizer *rotationGes = [[UIRotationGestureRecognizer alloc]init];
        rotationGes.delegate = self;
        [rotationGes addTarget:self action:@selector(rotGes:)];
        [vw addGestureRecognizer:rotationGes];
    }
}

-(void)rotGes:(UIRotationGestureRecognizer *)ges{
    ges.view.transform = CGAffineTransformRotate(ges.view.transform, ges.rotation);
    ges.rotation = 0;
}
//创建拖动手势 放大后才创建拖动手势。
-(void)createPanGesture
{
    for (UIImageView * vw in self.imageViewArr) {
        UIPanGestureRecognizer *panGse = [[UIPanGestureRecognizer alloc]init];
        panGse.delegate = self;
        [panGse addTarget:self action:@selector(panGes1:)];
        [vw addGestureRecognizer:panGse];
    }
}

-(void)panGes1:(UIPanGestureRecognizer *)ges
{
    CGPoint point = [ges translationInView:ges.view];
    ges.view.transform = CGAffineTransformTranslate(ges.view.transform, point.x, point.y);
    //偏移量清零(这个事手势，如果每次手势调用都不清理会自动累加到下次，造成不精确，所以每次都要清理上次的偏移量，重新计算下次的，保证精确)这个没有经过准确的计算
    //就是回到原先位置，然后从新计算，不然会累积到下次来
    [ges setTranslation:CGPointZero inView:ges.view];
}
//和其他手势一起进行
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}