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
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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
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// 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
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// 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
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// 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
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// 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
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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
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//// 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
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// 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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://www.cnblogs.com/xgao/archive/2017/03/27/6626446.html
