Question

ios 滑动手势 怎么判断左右滑动

Answer 1

iOS 滑动手势要判断左右滑动，可以通过UISwipeGestureRecognizer这个类里的direction来判断。

1. 首先，创建一个UISwipeGestureRecognizer的对象swipeGestureRecognizer.

2. 然后写一个if语句来判断滑动的方向，如下所示：

   if（swipeGestureRecognizer.direction == UISwipeGestureRecognizerDirectionRight）{

   //在这里写右滑的操作

   }else{

   //在这里写左滑的操作

   }
   

Answer 2

1. 先创建一个SingleView的项目.
2. 然后在主界面上放一个Label, 主要用于测试滑动是否起作用.

3. 给label增加一个Outlet. 取名为 "swipeLabel"

4. 在"ViewController.h"中增加两个手势property.

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@property (nonatomic, strong) UISwipeGestureRecognizer *leftSwipeGestureRecognizer;
@property (nonatomic, strong) UISwipeGestureRecognizer *rightSwipeGestureRecognizer;

并synthesize到"ViewController.m"文件中.

5.在"ViewController.m"文件中的"ViewDidLoad"方法中增加如下代码:

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self.leftSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipes:)];
self.rightSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipes:)];

self.leftSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
self.rightSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionRight;

[self.view addGestureRecognizer:self.leftSwipeGestureRecognizer];
[self.view addGestureRecognizer:self.rightSwipeGestureRecognizer];

6.并在"ViewController.m"中增加如下方法;

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- (void)handleSwipes:(UISwipeGestureRecognizer *)sender
{
if (sender.direction == UISwipeGestureRecognizerDirectionLeft) {
CGPoint labelPosition = CGPointMake(self.swipeLabel.frame.origin.x - 100.0, self.swipeLabel.frame.origin.y);
self.swipeLabel.frame = CGRectMake( labelPosition.x , labelPosition.y , self.swipeLabel.frame.size.width, self.swipeLabel.frame.size.height);
self.swipeLabel.text = @"尼玛的, 你在往左边跑啊....";
}

if (sender.direction == UISwipeGestureRecognizerDirectionRight) {
CGPoint labelPosition = CGPointMake(self.swipeLabel.frame.origin.x + 100.0, self.swipeLabel.frame.origin.y);
self.swipeLabel.frame = CGRectMake( labelPosition.x , labelPosition.y , self.swipeLabel.frame.size.width, self.swipeLabel.frame.size.height);
self.swipeLabel.text = @"尼玛的, 你在往右边跑啊....";
}
}

7. 保存, 编译, 运行....