iphone - UIControl 未接收到触摸

Question

我有一个 UIControl，它实现了 touches begind 方法，如下所示:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesBegan:touches withEvent:event];
    //More code goes here

UIControl 的这个子类在 View Controller 中实例化，然后作为 subview 添加到该 View Controller 。我在 UIControl 的 touches 开始方法处有一个断点，并且该方法永远不会被调用。我一直在做一些阅读，似乎 View Controller 有一些逻辑来决定是否将触摸事件传递给它的 subview 。奇怪的是，我在同一个 View Controller 中有一个不同的 UIControl 子类，当用户触摸它时，触摸事件会传递给它!这是完整的代码:

.h

#import <UIKit/UIKit.h>

@interface CustomSegment : UIView
@property (nonatomic, strong) UIImageView *bgImageView;
@property (nonatomic, assign) NSInteger segments;
@property (nonatomic, strong) NSArray *touchDownImages;
@property (nonatomic, readonly, assign) NSInteger selectedIndex;
@property (nonatomic, weak) id delegate;


- (id)initWithPoint:(CGPoint)point numberOfSegments:(NSInteger)_segments andTouchDownImages:(NSArray *)_touchDownImages;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
@end

.m

#import "CustomSegment.h"

@implementation CustomSegment
@synthesize bgImageView, segments, touchDownImages, selectedIndex, delegate;

- (id)initWithPoint:(CGPoint)point
   numberOfSegments:(NSInteger)_segments
           andTouchDownImages:(NSArray *)_touchDownImages  
{  
    self = [super initWithFrame:CGRectMake(point.x, point.y, [[_touchDownImages     objectAtIndex:0] size].width, [[touchDownImages objectAtIndex:0] size].height)];
if (self)
{
    touchDownImages = _touchDownImages;
    segments = _segments;
    bgImageView = [[UIImageView alloc] initWithImage:[touchDownImages objectAtIndex:0]];
    [self addSubview:bgImageView];
}
return self;
}

- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
    return YES;  
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //[super touchesBegan:touches withEvent:event];
    UITouch *touch = [touches anyObject];
    float widthOfSegment = [self frame].size.width / segments;
    float bottomPoint = 0;
    float topPoint = widthOfSegment;
    for (int i = 0; i < segments; i++)
    {
        if ([touch locationInView:self].x > bottomPoint && [touch locationInView:self].x < topPoint)
        {
            [bgImageView setImage:[touchDownImages objectAtIndex:i]];
            selectedIndex = i;
            return;
        }
        else
        {
            bottomPoint = topPoint;
            topPoint += topPoint;
        }
    }
}
@end

Answer 1

tl;dr 将 UIControl 的所有 subview 设置为 setUserInteractionEnabled:NO。 UIImageViews 默认设置为 NO。

原帖

我最近发现的一件事是，如果 UIControl 的最顶层 subview 具有 setUserInteractionEnabled:NO，它会有所帮助。我之所以这样做是因为我有一个带有 UIImageView 的 UIControl 子类，因为它只是 subview 并且工作正常。 UIImageView 默认将 userInteractionEnabled 设置为 NO。

我还有另一个带有 UIView 的 UIControl，因为它是最顶层的 subview (技术上是不同状态下的相同 UIControl)。我相信 UIView 默认为 userInteractionEnabled == YES，这排除了 UIControl 处理的事件。将 UIView 的 userInteractionEnabled 设置为 NO 解决了我的问题。

我不知道这是否是同一个问题，但也许这会有所帮助？

--编辑:当我说最顶层 View 时...可能将 UIControl 的所有 subview 设置为 setUserInteractionEnabled:NO