TA貢獻1784條經驗 獲得超2個贊
創建您的自定義TouchDownGestureRecognizer子類，并在touches中實現手勢。
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
實施：
#import "TouchDownGestureRecognizer.h"
TouchDownGestureRecognizer *touchDown = [[TouchDownGestureRecognizer alloc] initWithTarget:self action:@selector(handleTouchDown:)];
[yourView addGestureRecognizer:touchDown];
-(void)handleTouchDown:(TouchDownGestureRecognizer *)touchDown{
NSLog(@"Down");
}
迅捷的實現：
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
}
}
這是2017年要粘貼的Swift語法：
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
}
}
請注意，這是的替代品UITap。所以在像這樣的代碼中
func add(tap v:UIView, _ action:Selector) {
let t = UITapGestureRecognizer(target: self, action: action)
v.addGestureRecognizer(t)
}
您可以安全地交換到...。
func add(hairtriggerTap v:UIView, _ action:Selector) {
let t = SingleTouchDownGestureRecognizer(target: self, action: action)
v.addGestureRecognizer(t)
}
測試表明它不會被多次調用。它可以作為替代品。您可以在兩個通話之間進行交換。
TA貢獻1804條經驗 獲得超7個贊
使用UILongPressGestureRecognizer并將其設置minimumPressDuration為0。在UIGestureRecognizerStateBegan狀態期間，它將像著陸一樣。
對于Swift 4
func setupTap() {
let touchDown = UILongPressGestureRecognizer(target:self, action: #selector(didTouchDown))
touchDown.minimumPressDuration = 0
view.addGestureRecognizer(touchDown)
}
@objc func didTouchDown(gesture: UILongPressGestureRecognizer) {
if gesture.state == .began {
doSomething()
}
}
對于Objective-C
例：
-(void)setupLongPress
{
self.longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(didLongPress:)];
self.longPress.minimumPressDuration = 0;
[self.view addGestureRecognizer:self.longPress];
}
-(void)didLongPress:(UILongPressGestureRecognizer *)gesture
{
if (gesture.state == UIGestureRecognizerStateBegan){
[self doSomething];
}
}
TA貢獻1853條經驗 獲得超18個贊
Swift（無子類）
這是Swift版本，類似于Rob Caraway的Objective-C答案。
想法是使用minimumPressDuration設置為零的長按手勢識別器，而不是使用輕擊手勢識別器。這是因為長按手勢識別器報告觸摸開始事件，而點擊手勢沒有報告。
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var myView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
// Add "long" press gesture recognizer
let tap = UILongPressGestureRecognizer(target: self, action: #selector(tapHandler))
tap.minimumPressDuration = 0
myView.addGestureRecognizer(tap)
}
// called by gesture recognizer
@objc func tapHandler(gesture: UITapGestureRecognizer) {
// handle touch down and touch up events separately
if gesture.state == .began {
// do something...
print("tap down")
} else if gesture.state == .ended { // optional for touch up event catching
// do something else...
print("tap up")
}
}
}
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