手勢的簡單使用(6種)以及代理方法

注意：全部都是在UIView上操作手勢

代碼：

#import "ViewController.h"
@interface ViewController () <UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    //只要是手勢，默認都是相對於原來位置,且默認控制只支持一個手勢！！若想支持多個手勢，詳見下面的代理方法
//    [self setUpRotation];
//    [self setUpPinch];
    [self setUpPan];
}

#pragma mark - 點按手勢
- (void)setUpTap
{
    //創建點按手勢
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
    //需要連續點3次才能觸發
    //    tap.numberOfTapsRequired = 3;
    //往imageView上添加點按手勢
    [self.imageView addGestureRecognizer:tap];
    //設置點按手勢代理
    tap.delegate = self;
}

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

#pragma mark - 長按手勢
//默認觸發兩次（開始觸摸半秒后一次，結束觸摸一次）
- (void)setUpLongPress
{
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    [self.imageView addGestureRecognizer:longPress];
    longPress.delegate = self;
}

- (void)longPress:(UILongPressGestureRecognizer *)longPress
{
    開始的時候觸摸
    if (longPress.state == UIGestureRecognizerStateBegan) {
       NSLog(@"%s",__func__);
    }
    結束的時候觸摸
    if (longPress.state == UIGestureRecognizerStateEnded) {
        NSLog(@"%s",__func__);
    }
}

#pragma mark - 輕掃手勢
- (void)setUpSwipe
{
    //默認輕掃手勢往右划屏幕
    UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    //向上划
    swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
    [_imageView addGestureRecognizer:swipeUp];
    //一個清掃手勢只支持一個方向，如果想支持多個方向，必須創建多個
    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 - 旋轉手勢
//默認傳遞的角度都相對於最開始的位置
- (void)setUpRotation
{
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    rotation.delegate = self;
    [self.imageView addGestureRecognizer:rotation];
}
- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
    //讓圖片隨着手勢旋轉而旋轉,旋轉的角度相當於初始位置的值,配合rotation.rotation = 0;無法轉動
//    self.imageView.transform = CGAffineTransformMakeRotation(rotation.rotation);
    //手勢旋轉一下能讓圖片高速旋轉N圈，並且不受控制，方向不容易確定。配合rotation.rotation = 0;后角度一直為0
    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);   
    //復位
    rotation.rotation = 0;
    //獲取手勢旋轉的角度
    NSLog(@"%f",rotation.rotation);
}

#pragma mark - 捏合手勢
//兩根手指放大縮小圖片
- (void)setUpPinch
{
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    pinch.delegate = self;
    [self.imageView addGestureRecognizer:pinch];
}
- (void)pinch:(UIPinchGestureRecognizer *)pinch
{
    //放大的比例相對於原始點，注意：這個不能配合pinch.scale = 1使用，否則不能放大
//    self.imageView.transform = CGAffineTransformMakeScale(pinch.scale, pinch.scale);
    //隨着兩手指的距離增大，圖片會無規則的迅速的放大或者縮小（此處無法控制放大還是縮小），注意：配合pinch.scale = 1使用會正常的放大和縮小
    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
    //復位
    pinch.scale = 1;
    NSLog(@"%f",pinch.scale);
}

#pragma mark - 拖拽
//移動視圖
- (void)setUpPan
{
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    [self.imageView addGestureRecognizer:pan];
}
- (void)pan:(UIPanGestureRecognizer *)pan
{
    //獲取手勢的移動，相對於原始點
    CGPoint transP = [pan translationInView:self.imageView];
    self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);
    //復位
    [pan setTranslation:CGPointZero inView:self.imageView];
    NSLog(@"%@",NSStringFromCGPoint(transP));
}
@end

代理方法：

是否允許同時支持多個手勢，默認只支持一個手勢，要調用此方法注意設置代理
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

是否允許開始觸發手勢
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    return NO;
}

是否允許接收手機的觸摸(可以控制觸摸的范圍)
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    //獲取當前的觸摸點
    CGPoint currentP = [touch locationInView:self.imageView];
      在圖片的左半區域可以接受觸摸
    if (currentP.x < self.imageView.bounds.size.width * 0.5) {
        return YES;
    }else {
        return NO;
    }
}