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IOS中各種手勢操作實例代碼

 更新時間：2017年03月27日 15:43:51   作者：這酸爽！  
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,具體哪幾種大家通過本文學習吧，本文重點給大家介紹IOS中各種手勢操作實例代碼，一起看看吧

先看下效果

手勢相關的介紹

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{
 // 獲取平移的坐標點
 CGPoint transPoint = [ges translationInView:self.imgView];
}

平移手勢本身沒太多可設置的屬性，在平移事件觸發(fā)手，可以用  translationInView 方法獲取當前平移坐標點

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置 direction 屬性，默認是只監(jiān)聽從左向右，這是一個枚舉值 UISwipeGestureRecognizerDirection

UISwipeGestureRecognizerDirectionRight　　從左向右（默認值）
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{
 // 獲取平移的坐標點
 CGPoint transPoint = [ges translationInView:self.imgView];
 // 在之前的基礎上移動圖片
 self.imgView.transform = CGAffineTransformTranslate(self.imgView.transform, transPoint.x, transPoint.y);
 // 復原，必需復原
 // 每次都清空一下消除坐標疊加
 [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浀脧驮?！復原！復原！這點很重要！重要的事說3遍～～

　　平移手勢里面我們需要設置 setTranslation:CGPointZero 來復原它的坐標值，不然下一次事件觸發(fā)這個坐標值會疊加
　　縮放手勢里面設置 ges.scale = 1 來復原它的縮放值
　　旋轉(zhuǎn)手勢里面設置 ges.rotation = 0 來復原它的角度值

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，小編會及時回復大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持！

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