UIPanGestureRecognizer和UISwipeGestureRecognizer冲突?
当实现拖手势（UIPanGestureRecognizer）后将不能响应左右划（UISwipeGestureRecognizer）事件，事件会被拖手势栏截，所以左右划和拖手势只能选其一.
但是即需要拖手势还需要左右划手势呢?
我想到了一个简单方案.在UIPanGestureRecognizer基础上做一个轻滑手势.在一定的时间范围内滑动,视为左右划手势,反之为拖手势.
看代码~
- (void)viewDidLoad {
[superviewDidLoad];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizeralloc] initWithTarget:selfaction:@selector(panEvent:)];
[self.viewaddGestureRecognizer:pan];
}
#pragma mark - 创建一个定时器
- (void)createTimer:(void(^)(float indexSec))block {
_timerSource =dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,0, 0,dispatch_queue_create("timerSource",0));
// 时间间隔
double interval = 0.05f * NSEC_PER_SEC;
dispatch_source_set_timer(_timerSource,dispatch_time(DISPATCH_TIME_NOW,0), interval,0/*最小误差*/);
__block float sec =0;
dispatch_source_set_event_handler(_timerSource, ^{
sec += 0.5f;
dispatch_async(dispatch_get_main_queue(), ^{
// NSLog(@"sec = %f",sec);
block(sec);
});
});
dispatch_resume(_timerSource);
}
#pragma mark - 取消定时器
- (void)cancelTimer {
if (_timerSource) {
dispatch_source_cancel(_timerSource);
_timerSource = nil;
}
}
- (void)panEvent:(UIPanGestureRecognizer *)recognizer {
if (!_timerSource) {
_firstTime_x = -1;
_firstTime_y = -1;
// 定时器 在0.1秒内滑动视为轻滑
[self createTimer:^(float indexSec) {
_indexSec = indexSec;
}];
}
// 获取手指拖拽的时候,平移的值
CGPoint translation = [recognizer translationInView:recognizer.view];
// 大于0.1秒滑动时视为拖手势
if (_indexSec >1) {
NSLog(@"拖 ---> %@",NSStringFromCGPoint(translation));
myLabel.text = [NSStringstringWithFormat:@"拖->point = %@",NSStringFromCGPoint(translation)];
if (recognizer.state ==UIGestureRecognizerStateEnded) {
[self cancelTimer];
_indexSec = 0;
}
} else {
// 在0.1秒滑动结束后视为左右划
if (recognizer.state ==UIGestureRecognizerStateEnded) {
[self cancelTimer];
CGFloat lastTime_x = fabs(translation.x);
CGFloat lastTime_y = fabs(translation.y);
if (lastTime_y - _firstTime_y > 50 && lastTime_x - _firstTime_x < 100) {
NSLog(@"上下滑无效");
myLabel.text =@"上下滑无效";
} else if (lastTime_y - _firstTime_y < 100 && lastTime_x - _firstTime_x > 5) {
if (translation.x >0) {
NSLog(@"右");
myLabel.text =@"右滑";
} else {
NSLog(@"左");
myLabel.text =@"左滑";
}
}
_indexSec = 0;
}
if (_firstTime_x == -1) {
_firstTime_x = fabs(translation.x);
}
if (_firstTime_y == -1) {
_firstTime_y = fabs(translation.y);
}
}
}
Demo
有点不好的是 在拖拽的前0.1秒是不做事的