如今的電容屏?xí)r代，也就是智能時(shí)代，基本上人人都是智能手機(jī)了，然而智能手機(jī)的屏幕需要手來(lái)點(diǎn)，因此我們稱(chēng)這個(gè)點(diǎn)的動(dòng)作叫做手勢(shì)，在手機(jī)專(zhuān)門(mén)有個(gè)類(lèi)來(lái)識(shí)別這些手勢(shì)，今天就來(lái)介紹手勢(shì)識(shí)別器的用法。

//
//  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：要開(kāi)啟用戶交互和多點(diǎn)控制
    self.view.userInteractionEnabled = YES;
    self.view.multipleTouchEnabled = YES;
    /*
     手勢(shì)識(shí)別器：
        1.點(diǎn)擊
        2.輕掃
        3.捏合
        4.旋轉(zhuǎn)
        5.移動(dòng)
        6.長(zhǎng)按
     */
    /*
     
     PS:因?yàn)橛行┓椒〞?huì)相互沖突，需要調(diào)用這個(gè)函數(shù)
     [A requireGestureRecognizerToFail：B]函數(shù)，它可以指定當(dāng)A手勢(shì)發(fā)生時(shí)，即便A已經(jīng)滿足條件了，也不會(huì)立刻觸發(fā)，會(huì)等到指定的手勢(shì)B確定失敗之后才觸發(fā)。
     */
    
    //點(diǎn)擊手勢(shì) 1.單擊 2.雙擊
    UITapGestureRecognizer *tapClick = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleclickAction:)];
    [self.view addGestureRecognizer:tapClick];
    
    UITapGestureRecognizer *tapdoubleClick = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleclickAction:)];
    //雙擊屏幕調(diào)用的方法
    tapdoubleClick.numberOfTapsRequired = 2;
    [self.view addGestureRecognizer:tapdoubleClick];
    //雙擊失敗了就是單擊，進(jìn)行一個(gè)判別，不然每次雙擊的時(shí)候單擊都會(huì)調(diào)用一次
    [tapClick requireGestureRecognizerToFail:tapdoubleClick];
    
    //2.輕掃
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
    //向上滑，默認(rèn)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.旋轉(zhuǎn)
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
    [self.view addGestureRecognizer:rotation];
    //5.移動(dòng)
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
    [self.view addGestureRecognizer:pan];
    /*
     注意：這里移動(dòng)會(huì)出現(xiàn)沖突
     需要調(diào)用requeireGestureRecognizer方法
     */
    [pan requireGestureRecognizerToFail:swipe];
    //6.長(zhǎng)按
    UILongPressGestureRecognizer * longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];
    [self.view addGestureRecognizer:longPress];
    
    
}

//單機(jī)屏幕事件
- (void)singleclickAction:(UITapGestureRecognizer *)sender{
    NSLog(@"點(diǎn)擊了一下屏幕");
}

//雙擊屏幕事件
- (void)doubleclickAction:(UITapGestureRecognizer *)sender {
    NSLog(@"雙擊了屏幕");
}
//輕掃事件
- (void)swipeAction:(UISwipeGestureRecognizer *)sender {
    NSLog(@"輕掃屏幕");
}
//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){
        //恢復(fù)到原來(lái)的大小
        NSLog(@"旋轉(zhuǎn)結(jié)束");
        self.view.transform = CGAffineTransformIdentity;
    }
    
}
//旋轉(zhuǎn)
- (void)rotationAction:(UIRotationGestureRecognizer *)sender {
    if (sender.state == UIGestureRecognizerStateChanged) {
        CGFloat angle = sender.rotation;
        self.view.transform = CGAffineTransformMakeRotation(angle);
        NSLog(@"旋轉(zhuǎn)了屏幕");
    }else if (sender.state == UIGestureRecognizerStateEnded){
        NSLog(@"停止了旋轉(zhuǎn)");
        self.view.transform = CGAffineTransformIdentity;
    }

}

//平移
- (void)panAction:(UIPanGestureRecognizer *)sender {
    //平移的坐標(biāo)
    CGPoint moveDistance = [sender translationInView:self.view ];
    //這是一個(gè)實(shí)時(shí)調(diào)用的方法
    NSLog(@"平移了：%@",NSStringFromCGPoint(moveDistance));
}
//長(zhǎng)按
- (void)longPressAction:(UILongPressGestureRecognizer *)sender{
    if (sender.state == UIGestureRecognizerStateBegan) {
        NSLog(@"開(kāi)始長(zhǎng)按屏幕");
    }else if(sender.state == UIGestureRecognizerStateEnded){
        NSLog(@"結(jié)束長(zhǎng)按屏幕");
    }
    
}
@end