先看下效果
手势相关的介绍
IOS中手势操作一般是 UIGestureRecognizer 类的几个手势子类去实现，一般我们用到的手势就这么5种：
1、点击 UITapGestureRecognizer
2、平移 UIPanGestureRecognizer
3、缩放 UIPinchGestureRecognizer
4、旋转 UIRotationGestureRecognizer
5、轻扫 UISwipeGestureRecognizer
我们上面这个实例中就用到了上面这5种手势，不过其中 点击与轻扫没有体现出来，只是输出了下日志而已，一会看代码
下面我们来分别介绍下这几种手势
1、UITapGestureRecognizer 点击手势
UITapGestureRecognizer* tapGes = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGes:)];
// 点击次数，默认为1，1为单击，2为双击
tapGes.numberOfTapsRequired = 2;
这个点击手势类有一个属性 numberOfTapsRequired 用于设置点击数，就是点击几次才触发这个事件
2、UIPanGestureRecognizer 平移手势
// 平移手势
- (void)initPanGes{
UIPanGestureRecognizer* panGes = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGes:)];
[self.imgView addGestureRecognizer:panGes];
}
- (void)panGes:(UIPanGestureRecognizer*)ges{
// 获取平移的坐标点
CGPoint transPoint = [ges translationInView:self.imgView];
}
平移手势本身没太多可设置的属性，在平移事件触发手，可以用 translationInView 方法获取当前平移坐标点
3、UIPinchGestureRecognizer 缩放手势
// 缩放手势
- (void)initPinGes{
UIPinchGestureRecognizer* pinGes = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinGes:)];
[self.imgView addGestureRecognizer:pinGes];
}
- (void)pinGes:(UIPinchGestureRecognizer*)ges{
// 缩放
self.imgView.transform = CGAffineTransformScale(self.imgView.transform, ges.scale, ges.scale);
}
缩放手势在事件里面可以获取 scale 属性，表示当前缩放值
4、UIRotationGestureRecognizer 旋转手势
// 旋转手势
- (void)initRotation{
UIRotationGestureRecognizer* rotationGes = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGes:)];
[self.imgView addGestureRecognizer:rotationGes];
}
- (void)rotationGes:(UIRotationGestureRecognizer*)ges{
// 旋转图片
self.imgView.transform = CGAffineTransformRotate(self.imgView.transform, ges.rotation);
}
旋转手势在事件里面可以通过获取 rotation 属性获取当前旋转的角度
5、UISwipeGestureRecognizer 轻扫手势
// 轻扫手势
- (void)initSwipeGes{
// 创建 从右向左 轻扫的手势
UISwipeGestureRecognizer* swipeLeftGes = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeGes:)];
// 方向，默认是从左往右
// 最多只能开启一个手势，如果要开启多个就得创建多个手势
// 监听从右向左的方向
swipeLeftGes.direction = UISwipeGestureRecognizerDirectionLeft;
[self.imgView addGestureRecognizer:swipeLeftGes];
}
- (void)swipeGes:(UISwipeGestureRecognizer*)ges{
// ges.direction方向值
NSLog(@"%s diection:%lu",__func__,(unsigned long)ges.direction);
}
