先看下效果
手勢相關(guān)的介紹
IOS中手勢操作一般是 UIGestureRecognizer 類的幾個手勢子類去實現(xiàn)，一般我們用到的手勢就這么5種：
1、點擊 UITapGestureRecognizer
2、平移 UIPanGestureRecognizer
3、縮放 UIPinchGestureRecognizer
4、旋轉(zhuǎn) UIRotationGestureRecognizer
5、輕掃 UISwipeGestureRecognizer
我們上面這個實例中就用到了上面這5種手勢，不過其中 點擊與輕掃沒有體現(xiàn)出來，只是輸出了下日志而已，一會看代碼
下面我們來分別介紹下這幾種手勢
1、UITapGestureRecognizer 點擊手勢
UITapGestureRecognizer* tapGes = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGes:)];// 點擊次數(shù)，默認(rèn)為1，1為單擊，2為雙擊tapGes.numberOfTapsRequired = 2;
這個點擊手勢類有一個屬性 numberOfTapsRequired 用于設(shè)置點擊數(shù)，就是點擊幾次才觸發(fā)這個事件
2、UIPanGestureRecognizer 平移手勢
// 平移手勢- (void)initPanGes{ UIPanGestureRecognizer* panGes = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGes:)]; [self.imgView addGestureRecognizer:panGes];}- (void)panGes:(UIPanGestureRecognizer*)ges{ // 獲取平移的坐標(biāo)點 CGPoint transPoint = [ges translationInView:self.imgView];}平移手勢本身沒太多可設(shè)置的屬性，在平移事件觸發(fā)手，可以用 translationInView 方法獲取當(dāng)前平移坐標(biāo)點
3、UIPinchGestureRecognizer 縮放手勢
// 縮放手勢- (void)initPinGes{ UIPinchGestureRecognizer* pinGes = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinGes:)]; [self.imgView addGestureRecognizer:pinGes];}- (void)pinGes:(UIPinchGestureRecognizer*)ges{ // 縮放 self.imgView.transform = CGAffineTransformScale(self.imgView.transform, ges.scale, ges.scale);}縮放手勢在事件里面可以獲取 scale 屬性，表示當(dāng)前縮放值
4、UIRotationGestureRecognizer 旋轉(zhuǎn)手勢
// 旋轉(zhuǎn)手勢- (void)initRotation{ UIRotationGestureRecognizer* rotationGes = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGes:)]; [self.imgView addGestureRecognizer:rotationGes];}- (void)rotationGes:(UIRotationGestureRecognizer*)ges{ // 旋轉(zhuǎn)圖片 self.imgView.transform = CGAffineTransformRotate(self.imgView.transform, ges.rotation);}旋轉(zhuǎn)手勢在事件里面可以通過獲取 rotation 屬性獲取當(dāng)前旋轉(zhuǎn)的角度
5、UISwipeGestureRecognizer 輕掃手勢
// 輕掃手勢- (void)initSwipeGes{ // 創(chuàng)建 從右向左 輕掃的手勢 UISwipeGestureRecognizer* swipeLeftGes = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeGes:)]; // 方向，默認(rèn)是從左往右 // 最多只能開啟一個手勢，如果要開啟多個就得創(chuàng)建多個手勢 // 監(jiān)聽從右向左的方向 swipeLeftGes.direction = UISwipeGestureRecognizerDirectionLeft; [self.imgView addGestureRecognizer:swipeLeftGes];}- (void)swipeGes:(UISwipeGestureRecognizer*)ges{ // ges.direction方向值 NSLog(@"%s diection:%lu",__func__,(unsigned long)ges.direction);}輕掃手勢對象需要設(shè)置 direction 屬性，默認(rèn)是只監(jiān)聽從左向右，這是一個枚舉值 UISwipeGestureRecognizerDirection
UISwipeGestureRecognizerDirectionRight 從左向右（默認(rèn)值）UISwipeGestureRecognizerDirectionLeft 從右向左UISwipeGestureRecognizerDirectionUp 從下向上UISwipeGestureRecognizerDirectionDown 從上向下
下面看一下我們上面那個效果圖實現(xiàn)代碼吧
//// ViewController.m// 各種手勢操作//// Created by xgao on 16/3/24.// Copyright © 2016年 xgao. All rights reserved.//#import "ViewController.h"@interface ViewController ()<UIGestureRecognizerDelegate>@property (weak, nonatomic) IBOutlet UIImageView *imgView;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; [self initTapGes]; [self initPanGes]; [self initPinGes]; [self initRotation]; [self initSwipeGes];}// 點擊手勢- (void)initTapGes{ UITapGestureRecognizer* tapGes = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGes:)]; // 點擊次數(shù)，默認(rèn)為1，1為單擊，2為雙擊 tapGes.numberOfTapsRequired = 2; tapGes.delegate = self; [self.imgView addGestureRecognizer:tapGes];}- (void)tapGes:(UITapGestureRecognizer*)ges{ NSLog(@"%s",__func__);}// 平移手勢- (void)initPanGes{ UIPanGestureRecognizer* panGes = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGes:)]; panGes.delegate = self; [self.imgView addGestureRecognizer:panGes];}- (void)panGes:(UIPanGestureRecognizer*)ges{ // 獲取平移的坐標(biāo)點 CGPoint transPoint = [ges translationInView:self.imgView]; // 在之前的基礎(chǔ)上移動圖片 self.imgView.transform = CGAffineTransformTranslate(self.imgView.transform, transPoint.x, transPoint.y); // 復(fù)原，必需復(fù)原 // 每次都清空一下消除坐標(biāo)疊加 [ges setTranslation:CGPointZero inView:self.imgView]; NSLog(@"%s",__func__);}// 縮放手勢- (void)initPinGes{ UIPinchGestureRecognizer* pinGes = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinGes:)]; pinGes.delegate = self; [self.imgView addGestureRecognizer:pinGes];}- (void)pinGes:(UIPinchGestureRecognizer*)ges{ // 縮放 self.imgView.transform = CGAffineTransformScale(self.imgView.transform, ges.scale, ges.scale); // 復(fù)原 // 每次都清空一下消除疊加 ges.scale = 1;}// 旋轉(zhuǎn)手勢- (void)initRotation{ UIRotationGestureRecognizer* rotationGes = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGes:)]; rotationGes.delegate = self; [self.imgView addGestureRecognizer:rotationGes];}- (void)rotationGes:(UIRotationGestureRecognizer*)ges{ // 旋轉(zhuǎn)圖片 self.imgView.transform = CGAffineTransformRotate(self.imgView.transform, ges.rotation); // 復(fù)原 // 每次都清空一下消除疊加 ges.rotation = 0; NSLog(@"%s",__func__);}// 輕掃手勢- (void)initSwipeGes{ // 創(chuàng)建 從右向左 輕掃的手勢 UISwipeGestureRecognizer* swipeLeftGes = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeGes:)]; // 方向，默認(rèn)是從左往右 // 最多只能開啟一個手勢，如果要開啟多個就得創(chuàng)建多個手勢 // 監(jiān)聽從右向左的方向 swipeLeftGes.direction = UISwipeGestureRecognizerDirectionLeft; swipeLeftGes.delegate = self; [self.imgView addGestureRecognizer:swipeLeftGes]; // 創(chuàng)建 從下向上 輕掃的手勢 UISwipeGestureRecognizer* swipeUpGes = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeGes:)]; // 監(jiān)聽從下向上的方向 swipeUpGes.direction = UISwipeGestureRecognizerDirectionUp; swipeUpGes.delegate = self; [self.imgView addGestureRecognizer:swipeUpGes];}- (void)swipeGes:(UISwipeGestureRecognizer*)ges{ // ges.direction方向值 NSLog(@"%s diection:%lu",__func__,(unsigned long)ges.direction);}#pragma mark - UIGestureRecognizerDelegate// 判斷是否能觸發(fā)手勢- (BOOL)gestureRecognizerShouldBegin:(UITapGestureRecognizer *)gestureRecognizer{ return YES;}// 是否允許多手勢操作，不是多觸摸點- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ return YES;}@end這里需要注意的有兩點：
1、對于 平移、縮放、旋轉(zhuǎn) 這3個手勢，我們?nèi)绻盟闹等ヌ幚淼脑挘浀脧?fù)原！復(fù)原！復(fù)原！這點很重要！重要的事說3遍～～
平移手勢里面我們需要設(shè)置 setTranslation:CGPointZero 來復(fù)原它的坐標(biāo)值，不然下一次事件觸發(fā)這個坐標(biāo)值會疊加
縮放手勢里面設(shè)置 ges.scale = 1 來復(fù)原它的縮放值
旋轉(zhuǎn)手勢里面設(shè)置 ges.rotation = 0 來復(fù)原它的角度值
2、假如我們需要多手勢一起用的時候就需要設(shè)置下delegate 里面的一個返回參數(shù)的方法了
// 是否允許多手勢操作，不是多觸摸點- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ return YES;}以上所述是小編給大家介紹的IOS中各種手勢操作實例代碼,希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復(fù)大家的。在此也非常感謝大家對武林網(wǎng)網(wǎng)站的支持！
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