UI - 手势 - 简书

UIGestureRecognizer手势识别器

手势:有规律的触摸

UIGestureRecognizer抽象类：七种手势:轻拍(tap)长按(longPress)旋转(rotation)捏合(pinch)拖拽(pan)轻扫(swipe)屏幕边缘拖拽(screenEdgePan)

首先：添加图片以便于观察手势

添加图片的步骤

UIImageView *imgV = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,200,200)];

imgV.center = self.view.center;

imgV.image = [UIImage imageNamed:@"blank"];//blank是图片的名称

self.view addSubview:imgV];

[imgV release];

//打开用户交互

imgV.userInteractionEnable = YES;

轻拍tap

创建对象

获取到轻拍手势让 self调用tapAction：方法

UITapGestureREcognizer *tap = [[UITapGestureREcognizer alloc] initWithTarget:self action:@selector(tapAction:)];

添加手势

imgV addGestureRecognizer:tap];

内存管理

tap release];

点击次数

tap.numberOfTapsRequired = 2;

手指个数

tap.numberOfTouchsRequired = 2;

长按longPress

UILongPressGestureRecognizer *longPrss = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];

[imgV addGestureREcognizer:longPress];

[longPress release];

长按时间

longPress.minimumPressDuration = 1;

旋转rotation

UIRatationGestureRecognizer *rotation = [UIRatationGestureRecognizer alloc]initWithTarget:self action@selector(rotationAction:)];

[imgV addGestureREcognizer:rotation];

[rotation release];

捏合pinch

UIPinchGestureRecognizer *pinch = [UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];

[imgV addGestureREcognizer:pinch];

[pinch release];

拖拽pan

UIPanGestureRecognizer*pan = [[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(panAction:)];

[imgViewaddGestureRecognizer:pan];

[panrelease];

轻扫swipe

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(swipeAction:)];

默认只识别向右

设置方向时最多只能设置水平(左/右)或者垂直(上/下)

swipe.direction = UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft;//(按位或)

[imgView addGestureRecognizer:swipe];

[swipe release];

屏幕边缘拖拽screenEdgePan

UIScreenEdgePanGestureRecognizer*sep = [[UIScreenEdgePanGestureRecognizeralloc]initWithTarget:selfaction:@selector(sepAction:)];

需要设置拖拽的边缘

sep.edges=UIRectEdgeLeft;

一般这个手势添加在VC的view上

[self.viewaddGestureRecognizer:sep];

[seprelease];

UI - 手势