标签：
触摸
响应者对象
在iOS中不是任何对象都能处理事件,只有继承了UIResponder的对象才能接收并处理事件.我们称之为"响应者对象".
UIApplication,UIViewController,UIView都继承自UIResponder,因此它们都是响应者对象,都能够接收并处理事件.
UIView??????不接受触摸时间的三种情况??????????????????
• ????不接受用户交互????????????userInteractionEnable = NO;??（例如：UILabel与UIImageView????这些控件userInteractionEnable默认为??????NO因此这些控件默认是不能接受触摸事件的）
• ??隐藏：??hidden=YES;
• 透明：????alpha=0.0~0.01
????响应触摸的方法，可以通过UIResponder如下的四个方法来实现
• -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;????????????????
//当用户开始触摸时触发该方法
• -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;????????????????????//当用户手指开始移动时触发该方法
• -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;??????????//当用户触摸结束时触发该方法
• -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent*)event;??????????????????????????????//当系统事件（比如内存不足，电话呼入）终止了触摸事件时激发该方法
//当用户开始触摸时触发该方法
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
NSArray *touchArr = [touches allObjects];//获取用户开始触摸时手指的数量
UITouch *touch = [touchArr objectAtIndex:0];
CGPoint point = [touch locationInView:[touch view]]; //获取开始触摸时手指的位置
// NSLog(@"%d",touch.tapCount);//获取手指短时间内点击的次数
if (touch.tapCount == 1) {
[self performSelector:@selector(tapOne) withObject:nil afterDelay:0.5];
//延迟0.5秒调用方法tapOne
}
if (touch.tapCount == 2) {
//如果用户要只是响应双击,销毁延迟调用
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tapOne) object:nil];
}
}
-(void)tapOne
{
NSLog(@"点击一次");
}
//当用户手指开始移动时触发该方法
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
NSLog(@"手指移动");
}
//当用户触摸结束时触发该方法
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
NSLog(@"触摸手势结束");
}
//当系统事件（比如内存不足，电话呼入）终止了触摸事件时激发该方法
- (void)touchesCancelled:(nullable NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
}
UITapGestureRecognizer 点击
label = [[UILabel alloc]initWithFrame:CGRectMake(self.view.bounds.size.width/2-50, self.view.bounds.size.height/2-50, 100, 100)];
label.backgroundColor = [UIColor greenColor];
label.userInteractionEnabled = YES;
[self.view addSubview:label];
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGestureHandle:)];
tapGesture.numberOfTapsRequired = 1; //需要点击的次数
tapGesture.numberOfTouchesRequired = 1; //需要1根手指点击
[label addGestureRecognizer:tapGesture];
-(void)tapGestureHandle:(UITapGestureRecognizer *)gesture
{
NSLog(@"点击触发");
CGPoint point = [gesture locationInView:self.view]; //获取点击坐标
//
}
UIPinchGestureRecognizer 捏合
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchGestureHandle:)];
label.multipleTouchEnabled = YES; //允许支持多点触摸
[label addGestureRecognizer:pinchGesture];
-(void)pinchGestureHandle:(UIPinchGestureRecognizer *)gesture
{
CGFloat scale = gesture.scale; //获取用户捏合比例
CGFloat velocity = gesture.velocity; //获取用户捏合速度
label.transform = CGAffineTransformScale(label.transform, scale, scale);
gesture.scale = 1.0;
}
UIPanGestureRecognizer 拖拽
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGestureHandle:)];
panGesture.maximumNumberOfTouches = 1; //允许该收拾处理器最多支持几个手指拖动
panGesture.minimumNumberOfTouches = 1;//允许该收拾处理器最少支持几个手指拖动
[label addGestureRecognizer:panGesture];
-(void)panGestureHandle:(UIPanGestureRecognizer *)gesture
{
CGPoint point = [gesture translationInView:label]; // 获取控件位移
label.transform = CGAffineTransformTranslate(label.transform, point.x, point.y);
[gesture setTranslation:CGPointMake(0, 0) inView:label];
}
UISwipeGestureRecognizer 轻扫
由于一个控件指甲一次轻扫手势只支持一个方向上的轻扫，如果需要四个方向上的轻扫手势，需要加四次
for (int i = 0; i < 4; i ++) {
UISwipeGestureRecognizer *swipGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipGestureHandle:)];
swipGesture.numberOfTouchesRequired = 1;
swipGesture.direction = 1 << i;
[label addGestureRecognizer:swipGesture];
}
-(void)swipGestureHandle:(UISwipeGestureRecognizer *)gesture
{
if (gesture.direction == UISwipeGestureRecognizerDirectionRight) {
NSLog(@"向右轻扫");
}
if (gesture.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"向左轻扫");
}
if (gesture.direction == UISwipeGestureRecognizerDirectionDown) {
NSLog(@"向下轻扫");
}
if (gesture.direction == UISwipeGestureRecognizerDirectionUp) {
NSLog(@"向上轻扫");
}
}
UILongPressGestureRecognizer 长按
UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPress:)];
longPress.minimumPressDuration=1; //至少按下多少秒会触发手势
longPress.allowableMovement=1; //允许手指移动的最大距离
longPress.numberOfTouchesRequired=1; //允许用户用几根手指触发该手势
[_viewText addGestureRecognizer:longPress];
使用长按手势来显示自定义菜单项 UIMenuItem *transmItem = [[UIMenuItem alloc]initWithTitle:@"转发" action:@selector(transmItem:)];
UIMenuItem *deleteItem = [[UIMenuItem alloc]initWithTitle:@"删除" action:@selector(deleteItem:)];
UIMenuItem *reportItem = [[UIMenuItem alloc]initWithTitle:@"举报" action:@selector(reportItem:)];
-(void)handleLongPress:(UILongPressGestureRecognizer *)gesture
{
if (gesture.state == UIGestureRecognizerStateBegan) {
NSLog(@"长按手势");
[self becomeFirstResponder];
UIMenuController *menu=[UIMenuController sharedMenuController];
menu.menuItems=@[transmItem,deleteItem,reportItem];
CGRect rect=CGRectMake(10, 10, 100, 50);
[menu setTargetRect:rect inView:_viewText];
[menu setMenuVisible:YES animated:YES];
}
}
-(BOOL)canBecomeFirstResponder
{
return YES;
}
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if (action == @selector(transmItem:)||action == @selector(deleteItem:)||action == @selector(reportItem:))
{return YES;}else{
return NO;}
}
-(void)transmItem:(id)sender
{
NSLog(@"转发");
}
-(void)deleteItem:(id)sender
{
NSLog(@"删除");
}
-(void)reportItem:(id)sender
{
NSLog(@"转发");
}
//是否阻止另一个手势
-(BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)geature{
return NO;
}
-(BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer
{
return NO;
}
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原文地址：http://www.cnblogs.com/handonglengxueMing/p/5077883.html
