Question

如果在uiscrollview上有uiscrollview和多个子视图。如何知道用户触摸的位置，即特定视图或滚动视图（空白区域）

Answer 1

使用这种方法：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
        UITouch *touch = [touches anyObject];
        NSLog(@"View touched: %@", touch.view);
}

每次手指触摸屏幕时都会调用此方法，并且触摸会知道它触摸了哪个视图。

编辑：它不能在UIScrollView上工作，因为滚动视图会自动触摸，请检查：

touchesBegan method not called when scrolling in UIScrollView

How to enable touch began in UIScrollView?

Answer 2

您有两种方法可以在scrollView中使用- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;检测触摸：

首先，在viewController中实现此方法，并在此viewController上添加scrollview。

第二，我建议：创建一个从UIScrollView继承的自定义类，如下所示： .H：

@interface CustomScrollView : UIScrollView 

@end

的.m：

#import "CustomScrollView.h"


@implementation CustomScrollView

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

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    if(!self.dragging){
        [self.nextResponder touchesMoved:touches withEvent:event];
    }
}

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

@end

在你的vc make：

...

CustomScrollView* customScrollView = [[CustomScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];

...

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
        UITouch *touch = [touches anyObject];
        NSLog(@"View touched: %@", touch.view);
}

如何知道用户在屏幕上触摸的视图

2 个答案: