手势的简单使用(6种)以及代理方法

注意：全部都是在UIView上操作手势

代码：

#import "ViewController.h"
@interface ViewController () <UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    //只要是手势，默认都是相对于原来位置,且默认控制只支持一个手势！！若想支持多个手势，详见下面的代理方法
//    [self setUpRotation];
//    [self setUpPinch];
    [self setUpPan];
}

#pragma mark - 点按手势
- (void)setUpTap
{
    //创建点按手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
    //需要连续点3次才能触发
    //    tap.numberOfTapsRequired = 3;
    //往imageView上添加点按手势
    [self.imageView addGestureRecognizer:tap];
    //设置点按手势代理
    tap.delegate = self;
}

- (void)tap:(UITapGestureRecognizer *)tap
{
    NSLog(@"%s",__func__);
}

#pragma mark - 长按手势
//默认触发两次（开始触摸半秒后一次，结束触摸一次）
- (void)setUpLongPress
{
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    [self.imageView addGestureRecognizer:longPress];
    longPress.delegate = self;
}

- (void)longPress:(UILongPressGestureRecognizer *)longPress
{
    开始的时候触摸
    if (longPress.state == UIGestureRecognizerStateBegan) {
       NSLog(@"%s",__func__);
    }
    结束的时候触摸
    if (longPress.state == UIGestureRecognizerStateEnded) {
        NSLog(@"%s",__func__);
    }
}

#pragma mark - 轻扫手势
- (void)setUpSwipe
{
    //默认轻扫手势往右划屏幕
    UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    //向上划
    swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
    [_imageView addGestureRecognizer:swipeUp];
    //一个清扫手势只支持一个方向，如果想支持多个方向，必须创建多个
    UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    //向下划
    swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
    [_imageView addGestureRecognizer:swipeDown];
}
- (void)swipe:(UISwipeGestureRecognizer *)swipe
{
    NSLog(@"%s",__func__);
}

#pragma mark - 旋转手势
//默认传递的角度都相对于最开始的位置
- (void)setUpRotation
{
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    rotation.delegate = self;
    [self.imageView addGestureRecognizer:rotation];
}
- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
    //让图片随着手势旋转而旋转,旋转的角度相当于初始位置的值,配合rotation.rotation = 0;无法转动
//    self.imageView.transform = CGAffineTransformMakeRotation(rotation.rotation);
    //手势旋转一下能让图片高速旋转N圈，并且不受控制，方向不容易确定。配合rotation.rotation = 0;后角度一直为0
    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);   
    //复位
    rotation.rotation = 0;
    //获取手势旋转的角度
    NSLog(@"%f",rotation.rotation);
}

#pragma mark - 捏合手势
//两根手指放大缩小图片
- (void)setUpPinch
{
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    pinch.delegate = self;
    [self.imageView addGestureRecognizer:pinch];
}
- (void)pinch:(UIPinchGestureRecognizer *)pinch
{
    //放大的比例相对于原始点，注意：这个不能配合pinch.scale = 1使用，否则不能放大
//    self.imageView.transform = CGAffineTransformMakeScale(pinch.scale, pinch.scale);
    //随着两手指的距离增大，图片会无规则的迅速的放大或者缩小（此处无法控制放大还是缩小），注意：配合pinch.scale = 1使用会正常的放大和缩小
    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
    //复位
    pinch.scale = 1;
    NSLog(@"%f",pinch.scale);
}

#pragma mark - 拖拽
//移动视图
- (void)setUpPan
{
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    [self.imageView addGestureRecognizer:pan];
}
- (void)pan:(UIPanGestureRecognizer *)pan
{
    //获取手势的移动，相对于原始点
    CGPoint transP = [pan translationInView:self.imageView];
    self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);
    //复位
    [pan setTranslation:CGPointZero inView:self.imageView];
    NSLog(@"%@",NSStringFromCGPoint(transP));
}
@end

代理方法：

是否允许同时支持多个手势，默认只支持一个手势，要调用此方法注意设置代理
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

是否允许开始触发手势
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    return NO;
}

是否允许接收手机的触摸(可以控制触摸的范围)
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    //获取当前的触摸点
    CGPoint currentP = [touch locationInView:self.imageView];
      在图片的左半区域可以接受触摸
    if (currentP.x < self.imageView.bounds.size.width * 0.5) {
        return YES;
    }else {
        return NO;
    }
}