[IOS]触摸事件和手势-阿里云开发者社区

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[IOS]触摸事件和手势

简介: 如何使用IOS中的触摸事件和手势,这也是增加我们IOS应用的一个重要的一个功能?下面我来用一个简单的Demo来入门一下吧! 实现的功能具备右滑动和双击操作: 双击切换图片: 友情提醒:要实现两点滑动,按住alt键和shift键试试 操作步骤: 1.

如何使用IOS中的触摸事件和手势,这也是增加我们IOS应用的一个重要的一个功能?下面我来用一个简单的Demo来入门一下吧!

实现的功能具备右滑动和双击操作:


双击切换图片:


友情提醒:要实现两点滑动,按住alt键和shift键试试

操作步骤:

1.创建一个SingleView的项目,在页面上添加一个子view和几个label;

2.ViewController.h:

#import <UIKit/UIKit.h>

@interface DXWViewController : UIViewController
@property (retain, nonatomic) IBOutlet UILabel *state;
@property (retain, nonatomic) IBOutlet UILabel *tapCount;
@property (retain, nonatomic) IBOutlet UILabel *xPoint;
@property (retain, nonatomic) IBOutlet UILabel *yPoint;
@property (retain, nonatomic) IBOutlet UILabel *touchNum;
@property (retain, nonatomic) IBOutlet UIView *otherView;
@property(retain,nonatomic)UIImageView *imgView;
@property(retain,nonatomic)UIImage *img;
@end

3.ViewController.m:

#import "DXWViewController.h"

@interface DXWViewController ()

@end

@implementation DXWViewController

//加载图片
-(void)loadimag:(NSString *)imgName
{
    self.img = [UIImage imageNamed:imgName];
    self.imgView = [[UIImageView alloc] initWithImage:self.img];
    CGRect rec = CGRectMake(5, 5, 150, 117);
    self.imgView.frame = rec;
    [self.otherView addSubview:self.imgView];
    
    [self.imgView release];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.img = [UIImage imageNamed:@"flower1.jpg"];
	//花开
    [self loadimag:@"flower1.jpg"];
    
}

-(void)fun:(NSSet *)touches
{
    UITouch *touch = [touches anyObject];
    int tapCount = [touch tapCount];
    CGPoint point = [touch locationInView:self.view];
    
    self.tapCount.text = [NSString stringWithFormat:@"tapCount %d",tapCount];
    int touchNum = [touches count];
    self.xPoint.text = [NSString stringWithFormat:@"x %.1f",point.x];
    self.yPoint.text = [NSString stringWithFormat:@"y %.1f",point.y];
    //接受多点,要设置允许多点
    self.touchNum.text = [NSString stringWithFormat:@"touchNum %d",touchNum];

}
//返回点击次数
-(int)getNumber:(NSSet *)touches
{
    UITouch *touch = [touches anyObject];
    int tapCount = [touch tapCount];
    CGPoint point = [touch locationInView:self.view];
    
    self.tapCount.text = [NSString stringWithFormat:@"tapCount %d",tapCount];
    int touchNum = [touches count];
    self.xPoint.text = [NSString stringWithFormat:@"x %.1f",point.x];
    self.yPoint.text = [NSString stringWithFormat:@"y %.1f",point.y];
    //接受多点,要设置允许多点
    self.touchNum.text = [NSString stringWithFormat:@"touchNum %d",touchNum];
    return tapCount;
    
}
BOOL flag = true;

float x=0;

//支持多点
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    
    //如果有子view的话如何获取子view的触摸事件
    //touches = [event touchesForView:self.otherView];
    self.state.text = @"touchesBegin";
    [self fun:touches];
    [self fun:[event touchesForView:self.otherView]];
    
    
    if ([self getNumber:[event touchesForView:self.otherView]] == 2) {
        if (flag) {
            
            [self loadimag:@"flower.jpg"];
            flag = false;
        }
        else
        {
            [self loadimag:@"flower1.jpg"];
            flag = true;
        }
    }
    
    
    UITouch *touch = [touches anyObject];
    CGPoint point = [touch locationInView:self.otherView];
    x = point.x;
        
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    //自己自定义手势
    UITouch *touch = [touches anyObject];
    CGPoint point = [touch locationInView:self.otherView];
    float moveX = 0;
    moveX = point.x;
    if ((moveX-x)>100) {
        NSLog(@"右滑");
    }
}

- (void)dealloc {
    [_state release];
    [_tapCount release];
    [_xPoint release];
    [_yPoint release];
    [_touchNum release];
    [_otherView release];
    [super dealloc];
}
@end

4.要注意,要把页面设置一下,设置能多点识别的属性。

5.也可以通过拖放一个手势控件来实现手势,在页面中有一个Swipe Gesture Recognizer的手势控件

- (void)viewDidLoad
{
    [super viewDidLoad];
    //代码创建手势
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(gesture:)];
    swipe.direction = UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft;
    
    //添加上手势,控件添加
    [self.view addGestureRecognizer:swipe];
}

-(void)gesture:(id)sender
{
    NSLog(@"left or right");
}

- (IBAction)swipe:(id)sender {
    NSLog(@"right");
}

6.实现单击/双击触发事件        

-(void)viewLoad
{
//点击事件
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(fun1)];
    //单点触摸
    tap.numberOfTouchesRequired = 1;
    //点击几次,如果是1就是单击
    tap.numberOfTapsRequired = 1;
    [self.view addGestureRecognizer:tap];
}

//一次点击事件
-(void)fun1
{
    NSLog(@"click1");
}

==================== 迂者 丁小未 CSDN博客专栏=================

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