爲什麼輕擊手勢識別器能夠識別父視圖上的視圖中的輕敲？

Question

我有一個UIView和它敲擊手勢識別：

UIImageView *tabView = [[UIImageView alloc] initWithFrame:CGRectMake(41, 145, 702, 100)]; 
tabView.image = [UIImage imageNamed:@"inactive_tab"]; 
tabView.userInteractionEnabled = YES; 
UITapGestureRecognizer *singleFingerTap = 
[[UITapGestureRecognizer alloc] initWithTarget:self 
             action:@selector(handleSingleTap:)]; 
[tabView addGestureRecognizer:singleFingerTap]; 
[self.scrollView addSubview:tabView]; 

我上添加滾動視圖另一種觀點認爲：

[self.scrollView addSubview:self.activeTab]; 

activeTab是在inactiveTap。當我點擊activeTap時，手勢識別器發出火，但我不想發生。我怎樣才能避免這種情況？

Answer 1

使用UIGestureRecognizerDelegate及其方法gestureRecognizer:shouldReceiveTouch:。 如果您不想在該視圖上觸摸，您可以檢查觸點是否位於視圖框架內並返回NO。'

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch { 
    CGPoint touchLocation = [touch locationInView:self.view]; 
    return !CGRectContainsPoint(self.activeTab.frame, touchLocation); 
}