几种常用的iOS手势操作

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>

/** 图片 */
@property (nonatomic, weak) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.imageView.userInteractionEnabled = YES;
    
    [self setUpTap];
    
    [self setUpLongPress];
    
    [self setUpSwipe];
    
    [self setUpRotation];
    
    [self setPinch];
    
    [self setPan];
}

/*------------长按手势----------------*/

- (void)setUpTap {
    
    // 创建点击事件
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];
    
    tap.delegate = self;
    
    [self.imageView addGestureRecognizer:tap];
    
}

// 点击事件
- (void)tap {
    
    NSLog(@"%s", __func__);
}

/*------------长按手势----------------*/

- (void)setUpLongPress {
    
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    longPress.delegate = self;

    [self.imageView addGestureRecognizer:longPress];
}

// 长按手势事件
- (void)longPress:(UILongPressGestureRecognizer *)sender {
    
    // 注意：长安手势可以触发两次事件，我们需要判断手势状态，如下
    if (sender.state == UIGestureRecognizerStateEnded) {
        
        NSLog(@"%s", __func__);
    }
}

/*------------轻扫手势----------------*/

- (void)setUpSwipe {
    
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    
    swipe.delegate = self;

    // 注意：如果以后想要一个控件支持多个方向的清扫，必须创建多个清扫手势，一个清扫手势只能支持一个方向
    // 默认清扫手势的方向是向右
    swipe.direction = UISwipeGestureRecognizerDirectionRight;
    
    [self.imageView addGestureRecognizer:swipe];
}

// 轻扫手势事件
- (void)swipe:(UISwipeGestureRecognizer *)sender {
    
    NSLog(@"%s", __func__);
}

/*------------旋转手势----------------*/

- (void)setUpRotation {
    
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    
    rotation.delegate = self;

    [self.imageView addGestureRecognizer:rotation];
}

// 旋转手势事件
- (void)rotation:(UIRotationGestureRecognizer *)sender {
    
    // 注意：手势传递的旋转角度都是相对于最开始的位置
    
    CGFloat rotation = sender.rotation;
    
    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation);
    
    // 复位
    sender.rotation = 0;
    
    NSLog(@"%s", __func__);
}

/*------------捏合手势----------------*/

- (void)setPinch {
    
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    
    pinch.delegate = self;

    [self.imageView addGestureRecognizer:pinch];
}

// 捏合手势事件
- (void)pinch:(UIPinchGestureRecognizer *)sender {
    
    CGFloat scale = sender.scale;
    
    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, scale, scale);
    
    // 复位
    sender.scale = 1.0;
    
    NSLog(@"%s", __func__);
}

/*------------拖拽手势----------------*/

- (void)setPan {
    
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    
    pan.delegate = self;
    
    [self.imageView addGestureRecognizer:pan];
}

// 拖拽手势事件
- (void)pan:(UIPanGestureRecognizer *)sender {
    
    // 获取手势的移动，也是相对于最开始的位置
    CGPoint transP = [sender translationInView:self.imageView];
    
    self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);
    
    // 复位
    [sender setTranslation:CGPointZero inView:self.imageView];
    
    NSLog(@"%s", __func__);
}

#pragma mark - <UIGestureRecognizerDelegate>

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    
    return YES;
}

// 是否允许同时支持多个手势， 默认不支持多个手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    
    return YES;
}

// 是否可以接收手指的触摸点(touch)
// 实例:该方法可以控制让一个视图，左边能点击，右边不能点击
//- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
//    
//    CGPoint currentPoint = [touch locationInView:self.imageView];
//    
//    if (currentPoint.x > self.imageView.bounds.size.width * 0.5) {
//        
//        return YES;
//    }
//    
//    return NO;
//}

@end