关于手势识别器的详细介绍

如今的电容屏时代，也就是智能时代，基本上人人都是智能手机了，然而智能手机的屏幕需要手来点，因此我们称这个点的动作叫做手势，在手机专门有个类来识别这些手势，今天就来介绍手势识别器的用法。

//
//  ViewController.m
//  demo-UIGesture
//
//  Created by mac on 16/8/1.
//  Copyright © 2016年 mac. All rights reserved.
//
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor colorWithRed:0.9 green:0.8 blue:0.8 alpha:1];
    //注意：要开启用户交互和多点控制
    self.view.userInteractionEnabled = YES;
    self.view.multipleTouchEnabled = YES;
    /*
     手势识别器：
        1.点击
        2.轻扫
        3.捏合
        4.旋转
        5.移动
        6.长按
     */
    /*
     
     PS:因为有些方法会相互冲突，需要调用这个函数
     [A requireGestureRecognizerToFail：B]函数，它可以指定当A手势发生时，即便A已经滿足条件了，也不会立刻触发，会等到指定的手势B确定失败之后才触发。
     */
    
    //点击手势 1.单击 2.双击
    UITapGestureRecognizer *tapClick = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleclickAction:)];
    [self.view addGestureRecognizer:tapClick];
    
    UITapGestureRecognizer *tapdoubleClick = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleclickAction:)];
    //双击屏幕调用的方法
    tapdoubleClick.numberOfTapsRequired = 2;
    [self.view addGestureRecognizer:tapdoubleClick];
    //双击失败了就是单击，进行一个判别，不然每次双击的时候单击都会调用一次
    [tapClick requireGestureRecognizerToFail:tapdoubleClick];
    
    //2.轻扫
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
    //向上滑，默认向右
    swipe.direction = UISwipeGestureRecognizerDirectionUp;
    [self.view addGestureRecognizer:swipe];
    //3.捏合
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
    [self.view addGestureRecognizer:pinch];
    //4.旋转
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
    [self.view addGestureRecognizer:rotation];
    //5.移动
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
    [self.view addGestureRecognizer:pan];
    /*
     注意：这里移动会出现冲突
     需要调用requeireGestureRecognizer方法
     */
    [pan requireGestureRecognizerToFail:swipe];
    //6.长按
    UILongPressGestureRecognizer * longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];
    [self.view addGestureRecognizer:longPress];
    
    
}

//单机屏幕事件
- (void)singleclickAction:(UITapGestureRecognizer *)sender{
    NSLog(@"点击了一下屏幕");
}

//双击屏幕事件
- (void)doubleclickAction:(UITapGestureRecognizer *)sender {
    NSLog(@"双击了屏幕");
}
//轻扫事件
- (void)swipeAction:(UISwipeGestureRecognizer *)sender {
    NSLog(@"轻扫屏幕");
}
//捏合
- (void)pinchAction:(UIPinchGestureRecognizer *)sender {
    
    if(sender.state == UIGestureRecognizerStateChanged){
        NSLog(@"一直捏合");
        CGFloat scale = sender.scale;
        self.view.transform = CGAffineTransformMakeScale(scale, scale);
    }else if(sender.state == UIGestureRecognizerStateEnded){
        //恢复到原来的大小
        NSLog(@"旋转结束");
        self.view.transform = CGAffineTransformIdentity;
    }
    
}
//旋转
- (void)rotationAction:(UIRotationGestureRecognizer *)sender {
    if (sender.state == UIGestureRecognizerStateChanged) {
        CGFloat angle = sender.rotation;
        self.view.transform = CGAffineTransformMakeRotation(angle);
        NSLog(@"旋转了屏幕");
    }else if (sender.state == UIGestureRecognizerStateEnded){
        NSLog(@"停止了旋转");
        self.view.transform = CGAffineTransformIdentity;
    }

}

//平移
- (void)panAction:(UIPanGestureRecognizer *)sender {
    //平移的坐标
    CGPoint moveDistance = [sender translationInView:self.view ];
    //这是一个实时调用的方法
    NSLog(@"平移了：%@",NSStringFromCGPoint(moveDistance));
}
//长按
- (void)longPressAction:(UILongPressGestureRecognizer *)sender{
    if (sender.state == UIGestureRecognizerStateBegan) {
        NSLog(@"开始长按屏幕");
    }else if(sender.state == UIGestureRecognizerStateEnded){
        NSLog(@"结束长按屏幕");
    }
    
}
@end