iphone - subview 内的 touchesMoved 检测

Question

我正在尝试检测 subview 内的触摸

在我的主视图 Controller 中，我添加了一个名为:SideBarForCategory 的 subview ，它占据了屏幕左侧的 30% - 作为侧边栏。

SideBarForCategory *sideBarForCategory = [[SideBarForCategory alloc] initWithNibName:@"SideBarForCategory" bundle:nil];  
[sideBarData addSubview:sideBarForCategory.view];

在 SideBarForCategory 中，我想测试触摸

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event touchesForView:self.view] anyObject];

    CGPoint location = [touch locationInView:touch.view];
    NSLog(@"Map Touch %f",location.x);

}

上面的代码 (touchesMoved) 在主视图 (viewcontroller) 上完美运行，但在我的 subview (SideBarForCategory) 中不起作用 - 为什么以及如何修复它？

Answer 1

我能想到的两种可能的解决方案:

1. 使用 GestureRecognizers(例如 UITapGestureRecognizer、UISwipeGestureRecognizer)并将这些识别器添加到您的 SideBarForCategory View 。

2. 通用手势处理:创建您自己的 UIView 自定义子类(例如 MyView)并在其中添加这些触摸方法。然后创建 SideBarForCategory View 作为 MyView 的实例。

希望它有用:)

更新: 对于第二个选项:

#import <UIKit/UIKit.h>

@interface MyView : UIView
@end





@implementation MyView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
  // No need to invoke |touchesBegan| on super
  NSLog(@"touchesBegan");
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
  // invoke |touchesMoved| on super so that scrolling can be handled
  [super touchesMoved:touches withEvent:event];
  NSLog(@"touchesMoved");
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
  [super touchesEnded:touches withEvent:event];
  NSLog(@"touchesEnded");
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
  /* no state to clean up, so null implementation */
  NSLog(@"touchesCancelled");
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end

更新: 然后在您的 SideBarCategoryView 类实现中，在 loadView() 中

self.view = [[MyView alloc] init];