我正在检测屏幕上的滑动,它完全按照我想要的方式工作。唯一的问题是,在测试中,我一遍又一遍地滑动,至少 90% 或更多的时间它在响应,但时不时地没有响应。
我 NSLog'd 一切以找到罪魁祸首,并发现 touchesBegan 在发生这种情况的几次中都没有被检测到。
这是我的代码,虽然 touchesBegan 甚至没有被调用,所以代码应该无关紧要:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(@"touches began!");
UITouch *touch = [touches anyObject];
CGPoint thisTouch = [touch locationInView:self.view];
touchstartedX = thisTouch.x;
touchstartedY = thisTouch.y;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
CGPoint p = [[touches anyObject] locationInView:self.view];
if ((abs(p.y - touchstartedY)) < 120) {
if ((p.x - touchstartedX) > 10) {
[self goPrevious];
} else if ((p.x - touchstartedX) < -10) {
[self goNext];
}
} else { NSLog(@"too much Y"); }
}
有任何想法吗?
谢谢!
* 使用解决方案编辑* 这是我根据 dredful 的建议探索 UISwipeGestureRecognizer 后最终使用的代码:
在.h中:
UIViewController <UIGestureRecognizerDelegate>
UISwipeGestureRecognizer *swipeLeft;
UISwipeGestureRecognizer *swipeRight;
@property (nonatomic, retain) UISwipeGestureRecognizer *swipeLeft;
@property (nonatomic, retain) UISwipeGestureRecognizer *swipeRight;
以 .m 为单位:
@synthesize swipeLeft, swipeRight;
UIGestureRecognizer *recognizer;
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
self.swipeLeft = (UISwipeGestureRecognizer *)recognizer;
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
self.swipeLeft = (UISwipeGestureRecognizer *)recognizer;
[recognizer release];
recognizer;
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
self.swipeRight = (UISwipeGestureRecognizer *)recognizer;
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
self.swipeRight = (UISwipeGestureRecognizer *)recognizer;
[recognizer release];
[self.view addGestureRecognizer:swipeLeft];
[self.view addGestureRecognizer:swipeRight];
- (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
[self goNext];
} else {
[self goPrevious];
}
}
- (void)dealloc
{
[swipeLeft release];
[swipeRight release];
[super dealloc];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.swipeLeft = nil;
self.swipeRight = nil;
}