源码0310-手势识别简单使用

利用UIGestureRecognizer，能轻松识别用户在某个view上面做的一些常见手势

UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，使用它的子类才能处理具体的手势
UITapGestureRecognizer(敲击)
UIPinchGestureRecognizer(捏合，用于缩放)
UIPanGestureRecognizer(拖拽)
UISwipeGestureRecognizer(轻扫)
UIRotationGestureRecognizer(旋转)
UILongPressGestureRecognizer(长按)

//  ViewController.m
//  10-手势识别简单使用
#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.\

[self setUpPinch];

[self setUpRotation];

[self setUpPan];

}
#pragma mark - 手势代理方法
// 是否允许开始触发手势
//- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
//{
//    return NO;
//}

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

// 是否允许接收手指的触摸点
//- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
//    // 获取当前的触摸点
//    CGPoint curP = [touch locationInView:self.imageView];
//    if (curP.x < self.imageView.bounds.size.width * 0.5) {
//        return NO;
//    }else{
//        return YES;
//    }
//}

#pragma mark - 点按手势

- (void)setUpTap
{
// 创建点按手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];

tap.delegate = self;

[_imageView addGestureRecognizer:tap];
}

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

#pragma mark - 长按手势
// 默认会触发两次
- (void)setUpLongPress
{
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];

[self.imageView addGestureRecognizer:longPress];
}
- (void)longPress:(UILongPressGestureRecognizer *)longPress
{
if (longPress.state == UIGestureRecognizerStateBegan) {
NSLog(@"%s",__func__);
}
}

#pragma mark - 清扫
- (void)setUpSwipe
{
// 默认轻扫的方向是往右
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe)];

swipe.direction = UISwipeGestureRecognizerDirectionUp;

[self.imageView addGestureRecognizer:swipe];

// 如果以后想要一个控件支持多个方向的轻扫，必须创建多个轻扫手势，一个轻扫手势只支持一个方向
// 默认轻扫的方向是往右
UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe)];

swipeDown.direction = UISwipeGestureRecognizerDirectionDown;

[self.imageView addGestureRecognizer:swipeDown];

}

- (void)swipe
{
NSLog(@"%s",__func__);
}

#pragma mark - 旋转手势
- (void)setUpRotation
{
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
rotation.delegate = self;
[self.imageView addGestureRecognizer:rotation];
}
// 默认传递的旋转的角度都是相对于最开始的位置
- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
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
- (void)setUpPinch
{
 UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
pinch.delegate = self;
[self.imageView addGestureRecognizer:pinch];
}

- (void)pinch:(UIPinchGestureRecognizer *)pinch
{
self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
// 复位
pinch.scale = 1;
}

#pragma mark - 拖拽
- (void)setUpPan
{　　//创建手势识别器对象；with。。传入了处理的方法；
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
　　//添加手势识别器到对应的View上；
[self.imageView addGestureRecognizer:pan];
}

- (void)pan:(UIPanGestureRecognizer *)pan
{
// 获取手势的触摸点
// CGPoint curP = [pan locationInView:self.imageView];

// 移动视图
// 获取手势的移动，也是相对于最开始的位置
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(curP));
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end