我使用tap事件的时间非常敏感,因此我很好奇是否有可能在用户简单按下时激活UITapGestureRecognizer,而不是要求他们同时按下吗?
创建您的自定义TouchDownGestureRecognizer子类,并在touches中实现手势。
TouchDownGestureRecognizer.h
#import <UIKit/UIKit.h> @interface TouchDownGestureRecognizer : UIGestureRecognizer @end
TouchDownGestureRecognizer.m
#import "TouchDownGestureRecognizer.h" #import <UIKit/UIGestureRecognizerSubclass.h> @implementation TouchDownGestureRecognizer -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ if (self.state == UIGestureRecognizerStatePossible) { self.state = UIGestureRecognizerStateRecognized; } } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ self.state = UIGestureRecognizerStateFailed; } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ self.state = UIGestureRecognizerStateFailed; } @end
实施:
#import "TouchDownGestureRecognizer.h" TouchDownGestureRecognizer *touchDown = [[TouchDownGestureRecognizer alloc] initWithTarget:self action:@selector(handleTouchDown:)]; [yourView addGestureRecognizer:touchDown]; -(void)handleTouchDown:(TouchDownGestureRecognizer *)touchDown{ NSLog(@"Down"); }
迅捷的实现:
import UIKit import UIKit.UIGestureRecognizerSubclass class TouchDownGestureRecognizer: UIGestureRecognizer { override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent) { if self.state == .Possible { self.state = .Recognized } } override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent) { self.state = .Failed } override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent) { self.state = .Failed } }
这是2017年要粘贴的Swift语法:
import UIKit.UIGestureRecognizerSubclass class SingleTouchDownGestureRecognizer: UIGestureRecognizer { override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) { if self.state == .possible { self.state = .recognized } } override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent) { self.state = .failed } override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent) { self.state = .failed } }
请注意,这是的替代品UITap。所以在像这样的代码中
UITap
func add(tap v:UIView, _ action:Selector) { let t = UITapGestureRecognizer(target: self, action: action) v.addGestureRecognizer(t) }
您可以安全地交换到…。
func add(hairtriggerTap v:UIView, _ action:Selector) { let t = SingleTouchDownGestureRecognizer(target: self, action: action) v.addGestureRecognizer(t) }
测试表明它不会被多次调用。它可以作为替代品。您可以在两个通话之间进行交换。