iOS开发:如何使用iOS手势UIGestureRecognizer
来源:互联网 发布:电商淘宝用户行为分析 编辑:程序博客网 时间:2024/05/29 08:40
UIKit中包含了UIGestureRecognizer类,用于检测发生在设备中的手势。UIGestureRecognizer是一个抽象类,定义了所有手势的基本行为,它有下面一些子类用于处理具体的手势:
1、拍击UITapGestureRecognizer (任意次数的拍击)
2、向里或向外捏UIPinchGestureRecognizer (用于缩放)
3、摇动或者拖拽UIPanGestureRecognizer
4、擦碰UISwipeGestureRecognizer (以任意方向)
5、旋转UIRotationGestureRecognizer (手指朝相反方向移动)
6、长按UILongPressGestureRecognizer
对于不同类型的手势识别器,具有不同的配置属性。比如UITapGestureRecognizer,可以配置拍击次数。界面接收到手势之后,可以发送一个消息,用于处理响应手势动作后的任务。当然,不同的手势识别器,发送的消息方法也会有所不同。下面列举几个具体示例代码:
1、一个手指,拍击两次手势
// 创建一个手势识别器
UITapGestureRecognizer *oneFingerTwoTaps =
[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease];
// Set required taps and number of touches
[oneFingerTwoTaps setNumberOfTapsRequired:2];
[oneFingerTwoTaps setNumberOfTouchesRequired:1];
// Add the gesture to the view
[[self view] addGestureRecognizer:oneFingerTwoTaps];
消息方法oneFingerTwoTaps
- (void)oneFingerTwoTaps
{
NSLog(@"Action: One finger, two taps");
}
2、两个手指,拍击两次手势
UITapGestureRecognizer *twoFingersTwoTaps =
[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease];
[twoFingersTwoTaps setNumberOfTapsRequired:2];
[twoFingersTwoTaps setNumberOfTouchesRequired:2];
[[self view] addGestureRecognizer:twoFingersTwoTaps];
消息方法twoFingersTwoTaps
- (void)twoFingersTwoTaps {
NSLog(@"Action: Two fingers, two taps");
}
3、一个手指向上、向下擦碰手势
// 向上擦碰
UISwipeGestureRecognizer *oneFingerSwipeUp =
[[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease];
[oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];
[[self view] addGestureRecognizer:oneFingerSwipeUp];
- (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer
{
CGPoint point = [recognizer locationInView:[self view]];
NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);
}
// 向下擦碰
UISwipeGestureRecognizer *oneFingerSwipeDown =
[[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease];
[oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];
[[self view] addGestureRecognizer:oneFingerSwipeDown];
- (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer
{
CGPoint point = [recognizer locationInView:[self view]];
NSLog(@"Swipe down - start location: %f,%f", point.x, point.y);
}
4、旋转手势
UIRotationGestureRecognizer *twoFingersRotate =
[[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease];
[[self view] addGestureRecognizer:twoFingersRotate];
- (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer
{
// Convert the radian value to show the degree of rotation
NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));
}
5、向里或向外捏的手势
UIPinchGestureRecognizer *twoFingerPinch =
[[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease];
[[self view] addGestureRecognizer:twoFingerPinch];
- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
{
NSLog(@"Pinch scale: %f", recognizer.scale);
}
6、响应上下左右滑动手势
-(void)viewDidLoad{UISwipeGestureRecognizer *recognizer; recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)]; [[self view] addGestureRecognizer:recognizer];[recognizer release]; recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)]; [[self view] addGestureRecognizer:recognizer];[recognizer release]; recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)]; [[self view] addGestureRecognizer:recognizer];[recognizer release]; UISwipeGestureRecognizer *recognizer; recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)]; [[self view] addGestureRecognizer:recognizer];[recognizer release];}-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer{if(recognizer.direction==UISwipeGestureRecognizerDirectionDown) { NSLog(@"swipe down");//执行程序}if(recognizer.direction==UISwipeGestureRecognizerDirectionUp) { NSLog(@"swipe up");//执行程序}if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft) { NSLog(@"swipe left");//执行程序}if(recognizer.direction==UISwipeGestureRecognizerDirectionRight) { NSLog(@"swipe right");//执行程序}}
- iOS开发:如何使用iOS手势UIGestureRecognizer
- iOS开发:如何使用iOS手势UIGestureRecognizer
- iOS开发:如何使用iOS手势UIGestureRecognizer
- iOS开发:如何使用iOS手势UIGestureRecognizer
- iOS开发:如何使用iOS手势UIGestureRecognizer
- iOS开发:如何使用iOS手势UIGestureRecognizer
- 如何使用iOS手势UIGestureRecognizer
- 如何使用iOS手势UIGestureRecognizer
- 如何使用iOS手势UIGestureRecognizer
- 如何使用iOS手势UIGestureRecognizer
- 如何使用iOS手势UIGestureRecognizer
- 使用iOS手势UIGestureRecognizer
- 使用iOS手势UIGestureRecognizer
- 使用iOS手势UIGestureRecognizer
- 使用iOS手势UIGestureRecognizer
- 使用iOS手势UIGestureRecognizer
- 使用iOS手势UIGestureRecognizer
- 使用iOS手势UIGestureRecognizer
- android问题解决:Your project contains errors,please fix them before running your application
- oracle数据库之常用的函数练习
- U-boot 的 bootcmd 和bootargs参数设置和环境变量的使用说明
- 关于Linux watchdog
- oracle数据库中比较常用的系统函数
- iOS开发:如何使用iOS手势UIGestureRecognizer
- HeapSort
- 关于堆操作的进一步研究
- 01背包问题
- 浅谈插入排序(代码)
- 中软国际Java程序员笔试题
- 浅谈合并排序(代码)
- 读取系统目录路径
- 用JS实现多样化的超链接提示效果