[英]Preventing MKMapView changing selection (cleanly)
我有一個MKPinAnnotationView
的自定義子類,顯示自定義調用。 我想處理該注釋中的觸摸事件。
我有一個有效的解決方案(下圖),但感覺不對。 我有一個經驗法則,每當我使用performSelector: .. withDelay:
我正在與系統作斗爭而不是使用它。
有沒有人為MKMapView和注釋選擇處理的積極事件處理有一個良好,干凈的解決方法?
我目前的解決方案
(我的注釋選擇類中的所有代碼)
我進行自己的熱門測試(沒有這個我的手勢識別器不會觸發,因為Map View會消耗這些事件:
- (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent*)event; {
// To enable our gesture recogniser to fire. we have to hit test and return the correct view for events inside the callout.
UIView* hitView = nil;
if (self.selected) {
// check if we tpped inside the custom view
if (CGRectContainsPoint(self.customView.frame, point))
hitView = self.customView;
}
if(hitView) {
// If we are performing a gesture recogniser (and hence want to consume the action)
// we need to turn off selections for the annotation temporarily
// the are re-enabled in the gesture recogniser.
self.selectionEnabled = NO;
// *1* The re-enable selection a moment later
[self performSelector:@selector(enableAnnotationSelection) withObject:nil afterDelay:kAnnotationSelectionDelay];
} else {
// We didn't hit test so pass up the chain.
hitView = [super hitTest:point withEvent:event];
}
return hitView;
}
請注意,我也關閉選擇,以便在我重寫的setSelected
我可以忽略取消選擇。
- (void)setSelected:(BOOL)selected animated:(BOOL)animated; {
// If we have hit tested positive for one of our views with a gesture recogniser, temporarily
// disable selections through _selectionEnabled
if(!_selectionEnabled){
// Note that from here one, we are out of sync with the enclosing map view
// we're just displaying out callout even though it thinks we've been deselected
return;
}
if(selected) {
// deleted code to set up view here
[self addSubview:_customView];
_mainTapGestureRecogniser = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(calloutTapped:)];
[_customView addGestureRecognizer: _mainTapGestureRecogniser];
} else {
self.selected = NO;
[_customView removeFromSuperview];
}
}
這條線評論1 ,我不喜歡,但它在theta延遲火災結束時也非常毛茸茸。 我必須走回superview鏈才能到達mapView,以便我可以說服選擇仍然存在。
// Locate the mapview so that we can ensure it has the correct annotation selection state after we have ignored selections.
- (void)enableAnnotationSelection {
// This reenables the seelction state and resets the parent map view's idea of the
// correct selection i.e. us.
MKMapView* map = [self findMapView];
[map selectAnnotation:self.annotation animated:NO];
_selectionEnabled = YES;
}
同
-(MKMapView*)findMapView; {
UIView* view = [self superview];
while(!_mapView) {
if([view isKindOfClass:[MKMapView class]]) {
_mapView = (MKMapView*)view;
} else if ([view isKindOfClass:[UIWindow class]]){
return nil;
} else{
view = [view superview];
if(!view)
return nil;
}
}
return _mapView;
}
這一切似乎沒有任何缺點和下行(就像我從其他解決方案中看到的閃爍一樣。它相對簡單,但感覺不對。
誰有更好的解決方案?
我不認為你需要使用地圖視圖的選擇跟蹤。 如果我正確地解釋了你想要的東西,你應該只用hitTest:withEvent:
override和canShowCallout
設置為NO
來完成它。 在setSelected:
執行你的標注出現/消失動畫。 您還應該覆蓋setHighlighted:
並調整自定義標注的顯示(如果可見)。
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