iOS手势应用

常用手势包括点按、轻扫、长按、捏合、旋转、拖拽手势等等

注意点:

• 对图片添加手势要开启用户交互
• 可以对图片添加多个手势，要实现代理协议，这个意思是说手势同时执行，比如一边放大一边旋转。

点按手势requireGestureRecognizerToFail

• 这个方法很好的控制了冲突问题，双击的时候点击也调用了

#pragma mark - 点按手势
// 创建点按手势
    UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap1:)];
    tap1.delegate = self;
    
    [_middleImageView addGestureRecognizer:tap1];

    
    // 创建点按手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
    // 点击两次触发
    tap.numberOfTapsRequired = 2;
    tap.delegate = self;
    
    [_middleImageView addGestureRecognizer:tap];
    
    // 双击失败算单机
    [tap1 requireGestureRecognizerToFail:tap];

- (void)tap1:(UITapGestureRecognizer *)tap1 {
    
    [self dismissViewControllerAnimated:YES completion:nil];
    
}

- (void)tap:(UITapGestureRecognizer *)tap {
    
    WXLog(@"///");
    // 获取手指的触摸点
    //    CGPoint curP = [tap locationInView:_middleImageView];
    _middleImageView.transform = CGAffineTransformMakeScale(1.5, 1.5);
    
}

轻扫手势, direction是手势的方向

// 添加手势
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    swipe.direction = UISwipeGestureRecognizerDirectionDown;
 
    [self addGestureRecognizer:swipe];

#pragma mark - 轻扫手势
- (void)swipe:(UISwipeGestureRecognizer *)swipe {
    
    [self shouHead];
    self.btn.selected = YES;
    
}

捏合手势

#pragma mark - 捏合手势
- (void)setUpPinch {
    UIPinchGestureRecognizer *pingch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pingch:)];
    pingch.delegate = self;
    [_middleImageView addGestureRecognizer:pingch];
}

- (void)pingch:(UIPinchGestureRecognizer *)pingch {
    
    _middleImageView.transform = CGAffineTransformScale(_middleImageView.transform, pingch.scale, pingch.scale);
    
    // 复位
    pingch.scale = 1;
    
}

旋转手势

#pragma mark - 旋转手势
- (void)setUpRotation {
    
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    rotation.delegate = self;
    [_middleImageView addGestureRecognizer:rotation];
}

- (void)rotation:(UIRotationGestureRecognizer *)rotation {
    
    _middleImageView.transform = CGAffineTransformRotate(_middleImageView.transform, rotation.rotation);
    
    // 复位
    rotation.rotation = 0;
    
}

长按手势

#pragma mark - 长按手势
- (void)setUpLongPress {
    
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    longPress.delegate = self;
    [_middleImageView addGestureRecognizer:longPress];
    
}


- (void)longPress:(UILongPressGestureRecognizer *)longPress {
    
    if (longPress.state == UIGestureRecognizerStateEnded) {
        
        // 弹出alert ，保存到手机
        UIAlertController *sheet = [UIAlertController alertControllerWithTitle:@"保存图片"
                                                                        message:@"是否保存"
                                                                 preferredStyle:UIAlertControllerStyleActionSheet];
                                    
        
        // 取消
        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            WXLog(@"取消");
        }];
        
        // 保存到手机
        UIAlertAction *phone = [UIAlertAction actionWithTitle:@"保存到手机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

            UIImageWriteToSavedPhotosAlbum(self.middleImageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
        }];
        
        
        [sheet addAction:phone];
        [sheet addAction:cancel];
        
        // 显示到界面
        [self presentViewController:sheet animated:YES completion:nil];
    }
    
}

// 存储图片
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    
    if (error) {
        [SVProgressHUD showErrorWithStatus:@"保存失败!"];
    } else {
        [SVProgressHUD showSuccessWithStatus:@"保存成功!"];
    }
    
}

拖拽手势

#pragma mark - 拖拽手势
- (void)setUpPan {
    
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    [_middleImageView addGestureRecognizer:pan];
}

- (void)pan:(UIPanGestureRecognizer *)pan {
    
    // 获取手势的移动
    CGPoint tranP = [pan translationInView:_middleImageView];
    
    _middleImageView.transform = CGAffineTransformTranslate(_middleImageView.transform, tranP.x, tranP.y);
    
    // 复位
    [pan setTranslation:CGPointZero inView:_middleImageView];
}

• 协议方法，应该说允许同时执行两个手势，比如边放大边缩放

#pragma mark - UIGestureRecognizerDelegate代理
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}