首先该ViewController 要遵守手势的协议
@interface ViewController () <UIGestureRecognizerDelegate>
{
UIImageView *_imageView;
}
常用的手势
/*
UITapGestureRecognizer Tap（点击）
UIPinchGestureRecognizer Pinch（捏合/二指往內或往外拨动）
UIRotationGestureRecognizer Rotation（旋转）
UISwipeGestureRecognizer Swipe（滑动，快速移动）
UIPanGestureRecognizer Pan （拖移，慢速移动）
UILongPressGestureRecognizer LongPress（长按）
*/
//alt/option 会出现两个手指 在模拟器
- (void)creatView{
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 200, 300)];
_imageView.image = [UIImage imageNamed:@"girl.jpg"];
//想让_imageView能和用户交互 比如点击 旋转等等 那么这时
//第一步必须打开用户交互
_imageView.userInteractionEnabled = YES;
//然后再增加手势就可以
[self.view addSubview:_imageView];
}
一、滑动手势的使用
#pragma mark - 滑动
- (void)creatGuesture5 {
//滑动手势 2048
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeClick:)];
//设置方向
swipe.direction = UISwipeGestureRecognizerDirectionLeft;
/*
UISwipeGestureRecognizerDirectionRight 向右滑动
UISwipeGestureRecognizerDirectionLeft
UISwipeGestureRecognizerDirectionUp
UISwipeGestureRecognizerDirectionDown
*/
//一个手势只能设置一个方向，四个方向都有滑动手势，必须创建四个滑动手势
[_imageView addGestureRecognizer:swipe];
[swipe release];
}
- (void)swipeClick:(UISwipeGestureRecognizer *)swipe {
NSLog(@"滑动");
switch (swipe.direction) {
case UISwipeGestureRecognizerDirectionLeft:
{
NSLog(@"左滑动");
}
break;
case UISwipeGestureRecognizerDirectionRight:
{
NSLog(@"右滑动");
}
break;
case UISwipeGestureRecognizerDirectionUp:
{
NSLog(@"上滑动");
}
break;
case UISwipeGestureRecognizerDirectionDown:
{
NSLog(@"下滑动");
}
break;
default:
break;
}
}
//2048 的滑动
#import "RootViewController.h"
@interface RootViewController ()
@end
@implementation RootViewController
{
UILabel *_label;
}
- (void)dealloc{
[_label release];
[super dealloc];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)creatLabel{
_label = [[UILabel alloc] initWithFrame:CGRectMake(110, 100, 100, 100)];
_label.text = @"2";
_label.layer.masksToBounds = YES;
_label.layer.cornerRadius = 5;
_label.textAlignment = NSTextAlignmentCenter;
_label.backgroundColor = [UIColor redColor];
[self.view addSubview:_label];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self creatLabel];
UISwipeGestureRecognizerDirection num[4] = {
UISwipeGestureRecognizerDirectionRight,
UISwipeGestureRecognizerDirectionLeft,
UISwipeGestureRecognizerDirectionUp,
UISwipeGestureRecognizerDirectionDown
};
//创建四个方向的滑动手势
for (int i = 0; i < 4; i++) {
//创建一个滑动手势
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
//设置手势方向
swipe.direction = num[i];
//给当前界面增加滑动手势
[self.view addGestureRecognizer:swipe];
[swipe release];
}
}
//当手指在屏幕上 上下左右滑动时候会触发这个函数
- (void)swipe:(UISwipeGestureRecognizer *)sw{
switch (sw.direction) {//手势的方向
//向右滑动
case UISwipeGestureRecognizerDirectionRight:
{
_label.center = CGPointMake(_label.center.x+100, _label.center.y);
}
break;
//向左滑动
case UISwipeGestureRecognizerDirectionLeft:
{
_label.center = CGPointMake(_label.center.x-100, _label.center.y);
}
break;
//向上滑动
case UISwipeGestureRecognizerDirectionUp:
{
_label.center = CGPointMake(_label.center.x, _label.center.y-100);
}
break;
//向下滑动
case UISwipeGestureRecognizerDirectionDown:
{
_label.center = CGPointMake(_label.center.x, _label.center.y+100);
}
break;
default:
break;
}
}
二、旋转、捏合、点击
#pragma mark - 手势协议
//是否允许 两个手势同时有效 (代理的方法)
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
NSLog(@"%@-%@",[gestureRecognizer class],[otherGestureRecognizer class]);
return YES;
}
#pragma mark - 旋转手势
- (void)creatGuesture3 {
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationClick:)];
//设置代理 (如果要两个手势同时有效) 旋转和捏合 同时有效
rotation.delegate = self;
[_imageView addGestureRecognizer:rotation];
[rotation release];
}
//旋转过程中一直调用
- (void)rotationClick:(UIRotationGestureRecognizer *)rotation {
NSLog(@"r:%f",rotation.rotation);//手势旋转的角度
//每次都是相对 当前的 旋转 (当前的都是参照物)
_imageView.transform = CGAffineTransformRotate(_imageView.transform, rotation.rotation);
//相对的弧度应该重置为0
rotation.rotation = 0;
}
#pragma mark - 捏合手势
- (void)creatGuesture2 {
//捏合手势 两个手指
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchClick:)];
//设置代理 (如果要两个手势同时有效)
pinch.delegate = self;
[_imageView addGestureRecognizer:pinch];
[pinch release];
}
//只要捏合就会一直调用
- (void)pinchClick:(UIPinchGestureRecognizer *)pinch {
NSLog(@"捏合%f",pinch.scale);
//可以进行 缩放
//pinch.scale获取手势的比例
//相当于最原始的
//_imageView.transform = CGAffineTransformMakeScale(pinch.scale, pinch.scale);
//相对对当前的_imageView.transform
_imageView.transform = CGAffineTransformScale(_imageView.transform, pinch.scale, pinch.scale);
//把手势比例重置为1 应该每次都是相对的
pinch.scale = 1;
}
#pragma mark - 点击手势
- (void)creatGuesture1 {
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
//设置 点击次数(1表示单击 2 表示双击)
tap.numberOfTapsRequired = 2;
//设置手指的个数
tap.numberOfTouchesRequired = 1;
//UIGestureRecognizer 所有手势的父类
//把手势加到图片视图
[_imageView addGestureRecognizer:tap];
[tap release];
}
- (void)tapClick:(UITapGestureRecognizer *)tap {
NSLog(@"点击手势");
}
三、拖动、拖拽手势
#pragma mark - 移动/拖拽
- (void)creatGuesture4 {
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panClick:)];
[_imageView addGestureRecognizer:pan];
[pan release];
}
- (void)panClick:(UIPanGestureRecognizer *)pan {
//获取 拖拽手势相对于self.view 的 偏移量
CGPoint curPoint = [pan translationInView:self.view];
NSLog(@"%@",NSStringFromCGPoint(curPoint));
CGPoint center = _imageView.center;
center.x += curPoint.x;
center.y += curPoint.y;
_imageView.center = center;
//把偏移量 重新设置为0 CGPointZero表示 0 0
[pan setTranslation:CGPointZero inView:self.view];
}
四、长按手势
#pragma mark - 长按手势
- (void)creatGuesture6 {
// 长按 删除 / 语音
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pressClick:)];
[_imageView addGestureRecognizer:longPress];
[longPress release];
}
- (void)pressClick:(UILongPressGestureRecognizer *)longPress {
NSLog(@"长按");
//会触发两次 一个长按开始的时候 还有就是长按结束的时候
//我们要处理这种现象
//UIGestureRecognizerStateBegan //开始
//UIGestureRecognizerStateEnded 结束
if (longPress.state == UIGestureRecognizerStateBegan) {
NSLog(@"长按开始");
}
}