Question

所以我有一个UIView的子类，假设检测触摸。仅当触摸在当前视图内开始时，视图检测才会触摸。当触摸从视图外部开始并且它们在我的自定义视图中移动时，touchesMoved不会被调用。有哪些解决方案可以检测当前视图中尚未启动的移动触摸？

@implementation MycustomView

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
   // This only gets called if touches have started in the current View
} 

@end

Answer 1

以下解决方案有效。我有MyCustomView的多个实例;当触摸移动时，我想要检测正在触摸的视图

我最终将MyCustomView的触摸检测移动到其superView，因此以下代码不再出现在MyCustomView类中：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.contentView];

    for (UIView *view in self.contentView.subviews)
    {
        if ([view isKindOfClass:[MyCustomView class]] &&
            CGRectContainsPoint(view.frame, touchLocation))
        {

        }
    }
}

Answer 2

这应该解决它：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
    UITouch *touch = [[event allTouches] anyObject];
    for (UIView* subView in self.subviews) 
    {
        if([subView pointInside:[self convertPoint:touch toView:subView] withEvent:event])
        {
            //do your code here
        }
    }
}

Answer 3

执行此操作的一种方法（尽管可能有其他方法）是禁用子视图的用户交互并使其父视图跟踪移动（使用hitTest方法确定触摸当前所在的视图）。

Answer 4

试试这个......

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    for(UITouch *touch in touches)
    {
        CGPoint touchPointFirstBtn = [touch locationInView:self.ChordView];
        if(CGRectContainsPoint(_btnC.frame, touchPointFirstBtn))
        {
            if (!_btnC.isHighlighted)
            {
                if(!Boolean)
                {
                    title = @"C";
                    [_tlbView reloadData];
                    NSLog(@"%@",@"touches C");

                }
                [_btnC setHighlighted:YES];
                Boolean = YES;

            }
        }
        else
        {
            [_btnC setHighlighted:NO];
            Boolean = NO;
        }
}

iOS - 检测UIView中的触摸？

4 个答案: