如何在按钮和 TouchUpInside 上使用两种不同的 SWIPE 方法？

Question

我有一个视图，其中有几个大按钮，我设置如下：

SwipeButton* btn = [[[SwipeButton alloc] initWithFrame:CGRectMake(55, 0, 300, 50)] autorelease];    
btn.tag = k;

[btn setBackgroundImage:[UIImage imageNamed:[NSString stringWithFormat:@"titleBackground.png"]] 
                                                              forState:UIControlStateNormal];
[btn   addTarget:self
          action:@selector(indexAction:)
forControlEvents:UIControlEventTouchUpInside];

我希望能够触摸这些按钮，然后触发 indexAction 方法，或者 - 如果识别到滑动 - 触发另一个方法。

我以为我是 UIButton 的子类，可以让滑动通过，但这并不是真正的解决方案，因为现在可以识别滑动和点击，所以这两种方法都会触发。

有没有办法解决这个问题？如果没有 SWIPE，我如何确定滑动的优先级并只允许 touchupinside？​​p>

非常感谢任何帮助。

这是我对 UIButton 进行子类化的方式：

#import "SwipeButton.h"

@implementation SwipeButton

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    [self.superview touchesBegan:touches withEvent:event];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    [super touchesMoved:touches withEvent:event];
    [self.superview touchesMoved:touches withEvent:event];
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];
    [self.superview touchesEnded:touches withEvent:event];

} 
@end

Answer 1

我认为您不需要继承 UIButton 类。你为什么不尝试这样的事情：

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *image = [UIImage imageNamed:@"picture_0.png"];
[button setImage:image forState:UIControlStateNormal];
[button setFrame:CGRectMake((applicationFrame.size.width - image.size.width)/2, applicationFrame.size.height/2, image.size.width, image.size.height)];
[button addTarget:self action:@selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];

UISwipeGestureRecognizer *recognizer;

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
[recognizer setDirection:UISwipeGestureRecognizerDirectionRight];
[recognizer setDelegate:self];
[[self view] addGestureRecognizer:recognizer];
[recognizer release];

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
[recognizer setDirection:UISwipeGestureRecognizerDirectionLeft];
[recognizer setDelegate:self];
[[self view] addGestureRecognizer:recognizer];
[recognizer release];

然后你创建方法来处理按钮上的点击和滑动：

// Prevent recognizing touches on the slider
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

if ([touch.view isKindOfClass:[UIButton class]]) {
    return YES;
}
return NO;
}

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {

if ([recognizer direction] == UISwipeGestureRecognizerDirectionLeft) {

    // Handle left swipe
    NSLog(@"left swipe");

} else {

    // Handle right swipe
    NSLog(@"right swipe");

}
}

- (void)buttonTapped:(id)sender {

NSLog(@"button pressed");

}

前面三个方法中的第一个是在协议中声明的，所以不要忘记说您的类正在实现该协议：

@interface MyViewController : UIViewController <UIGestureRecognizerDelegate>

它有效，我只是自己尝试过。希望能帮助到你！ ;)

Answer 2

查看UIGestureRecognizer documentation 和相关示例 (e.g.)。