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;
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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];
}
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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);
}
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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);
}
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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);
}
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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
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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
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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;
}
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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快网idc网站的支持！
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