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IOS中各种手势操作实例代码

2019年07月24日  | 移动技术网IT编程  | 我要评论

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先看下效果

手势相关的介绍

ios中手势操作一般是 uigesturerecognizer 类的几个手势子类去实现，一般我们用到的手势就这么5种：

1、点击  uitapgesturerecognizer

2、平移  uipangesturerecognizer

3、缩放  uipinchgesturerecognizer

4、旋转  uirotationgesturerecognizer

5、轻扫  uiswipegesturerecognizer

我们上面这个实例中就用到了上面这5种手势，不过其中 点击与轻扫没有体现出来，只是输出了下日志而已，一会看代码

下面我们来分别介绍下这几种手势

1、uitapgesturerecognizer 点击手势

uitapgesturerecognizer* tapges = [[uitapgesturerecognizer alloc]initwithtarget:self action:@selector(tapges:)];
// 点击次数，默认为1，1为单击，2为双击
tapges.numberoftapsrequired = 2;

这个点击手势类有一个属性 numberoftapsrequired 用于设置点击数，就是点击几次才触发这个事件

2、uipangesturerecognizer 平移手势

// 平移手势
- (void)initpanges{
 uipangesturerecognizer* panges = [[uipangesturerecognizer alloc]initwithtarget:self action:@selector(panges:)];
 [self.imgview addgesturerecognizer:panges];
}
- (void)panges:(uipangesturerecognizer*)ges{
 // 获取平移的坐标点
 cgpoint transpoint = [ges translationinview:self.imgview];
}

平移手势本身没太多可设置的属性，在平移事件触发手，可以用  translationinview 方法获取当前平移坐标点

3、uipinchgesturerecognizer 缩放手势

// 缩放手势
- (void)initpinges{
 uipinchgesturerecognizer* pinges = [[uipinchgesturerecognizer alloc]initwithtarget:self action:@selector(pinges:)];
 [self.imgview addgesturerecognizer:pinges];
}
- (void)pinges:(uipinchgesturerecognizer*)ges{
 // 缩放
 self.imgview.transform = cgaffinetransformscale(self.imgview.transform, ges.scale, ges.scale);
}

缩放手势在事件里面可以获取 scale 属性，表示当前缩放值

4、uirotationgesturerecognizer 旋转手势

// 旋转手势
- (void)initrotation{
 uirotationgesturerecognizer* rotationges = [[uirotationgesturerecognizer alloc]initwithtarget:self action:@selector(rotationges:)];
 [self.imgview addgesturerecognizer:rotationges];
}
- (void)rotationges:(uirotationgesturerecognizer*)ges{
 // 旋转图片
 self.imgview.transform = cgaffinetransformrotate(self.imgview.transform, ges.rotation);
}

旋转手势在事件里面可以通过获取 rotation 属性获取当前旋转的角度

5、uiswipegesturerecognizer 轻扫手势

// 轻扫手势
- (void)initswipeges{
 // 创建 从右向左 轻扫的手势
 uiswipegesturerecognizer* swipeleftges = [[uiswipegesturerecognizer alloc]initwithtarget:self action:@selector(swipeges:)];
 // 方向，默认是从左往右
 // 最多只能开启一个手势，如果要开启多个就得创建多个手势
 // 监听从右向左的方向
 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);
}

轻扫手势对象需要设置 direction 属性，默认是只监听从左向右，这是一个枚举值 uiswipegesturerecognizerdirection

uiswipegesturerecognizerdirectionright　　从左向右（默认值）
uiswipegesturerecognizerdirectionleft　　 从右向左
uiswipegesturerecognizerdirectionup　　　 从下向上
uiswipegesturerecognizerdirectiondown　　从上向下

下面看一下我们上面那个效果图实现代码吧

//
// viewcontroller.m
// 各种手势操作
//
// 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];
}
// 点击手势
- (void)inittapges{
 uitapgesturerecognizer* tapges = [[uitapgesturerecognizer alloc]initwithtarget:self action:@selector(tapges:)];
 // 点击次数，默认为1，1为单击，2为双击
 tapges.numberoftapsrequired = 2;
 tapges.delegate = self;
 [self.imgview addgesturerecognizer:tapges];
}
- (void)tapges:(uitapgesturerecognizer*)ges{
 nslog(@"%s",__func__);
}
// 平移手势
- (void)initpanges{
 uipangesturerecognizer* panges = [[uipangesturerecognizer alloc]initwithtarget:self action:@selector(panges:)];
 panges.delegate = self;
 [self.imgview addgesturerecognizer:panges];
}
- (void)panges:(uipangesturerecognizer*)ges{
 // 获取平移的坐标点
 cgpoint transpoint = [ges translationinview:self.imgview];
 // 在之前的基础上移动图片
 self.imgview.transform = cgaffinetransformtranslate(self.imgview.transform, transpoint.x, transpoint.y);
 // 复原，必需复原
 // 每次都清空一下消除坐标叠加
 [ges settranslation:cgpointzero inview:self.imgview];
 nslog(@"%s",__func__);
}
// 缩放手势
- (void)initpinges{
 uipinchgesturerecognizer* pinges = [[uipinchgesturerecognizer alloc]initwithtarget:self action:@selector(pinges:)];
 pinges.delegate = self;
 [self.imgview addgesturerecognizer:pinges];
}
- (void)pinges:(uipinchgesturerecognizer*)ges{
 // 缩放
 self.imgview.transform = cgaffinetransformscale(self.imgview.transform, ges.scale, ges.scale);
 // 复原
 // 每次都清空一下消除叠加
 ges.scale = 1;
}
// 旋转手势
- (void)initrotation{
 uirotationgesturerecognizer* rotationges = [[uirotationgesturerecognizer alloc]initwithtarget:self action:@selector(rotationges:)];
 rotationges.delegate = self;
 [self.imgview addgesturerecognizer:rotationges];
}
- (void)rotationges:(uirotationgesturerecognizer*)ges{
 // 旋转图片
 self.imgview.transform = cgaffinetransformrotate(self.imgview.transform, ges.rotation);
 // 复原
 // 每次都清空一下消除叠加
 ges.rotation = 0;
 nslog(@"%s",__func__);
}
// 轻扫手势
- (void)initswipeges{
 // 创建 从右向左 轻扫的手势
 uiswipegesturerecognizer* swipeleftges = [[uiswipegesturerecognizer alloc]initwithtarget:self action:@selector(swipeges:)];
 // 方向，默认是从左往右
 // 最多只能开启一个手势，如果要开启多个就得创建多个手势
 // 监听从右向左的方向
 swipeleftges.direction = uiswipegesturerecognizerdirectionleft;
 swipeleftges.delegate = self;
 [self.imgview addgesturerecognizer:swipeleftges];
 // 创建 从下向上 轻扫的手势
 uiswipegesturerecognizer* swipeupges = [[uiswipegesturerecognizer alloc]initwithtarget:self action:@selector(swipeges:)];
 // 监听从下向上的方向
 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
// 判断是否能触发手势
- (bool)gesturerecognizershouldbegin:(uitapgesturerecognizer *)gesturerecognizer{
 return yes;
}
// 是否允许多手势操作，不是多触摸点
- (bool)gesturerecognizer:(uigesturerecognizer *)gesturerecognizer shouldrecognizesimultaneouslywithgesturerecognizer:(uigesturerecognizer *)othergesturerecognizer{
 return yes;
}
@end

这里需要注意的有两点：

1、对于 平移、缩放、旋转 这3个手势，我们如果要用它的值去处理的话，要记得复原！复原！复原！这点很重要！重要的事说3遍～～

　　平移手势里面我们需要设置 settranslation:cgpointzero 来复原它的坐标值，不然下一次事件触发这个坐标值会叠加
　　缩放手势里面设置 ges.scale = 1 来复原它的缩放值
　　旋转手势里面设置 ges.rotation = 0 来复原它的角度值

2、假如我们需要多手势一起用的时候就需要设置下delegate 里面的一个返回参数的方法了

// 是否允许多手势操作，不是多触摸点
- (bool)gesturerecognizer:(uigesturerecognizer *)gesturerecognizer shouldrecognizesimultaneouslywithgesturerecognizer:(uigesturerecognizer *)othergesturerecognizer{
 return yes;
}

以上所述是小编给大家介绍的ios中各种手势操作实例代码,希望对大家有所帮助

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