iphone – UITextView触摸事件未触发

2023年11月13日 219次阅读

我有一个UITextView,我想检测一次点击.

看起来我可以简单地覆盖touchesEnded：withEvent并检查[[touches anyObject] tapCount] == 1,但是这个事件甚至不会触发.

如果我覆盖这样的4个事件：

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

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
        NSLog(@"touches moved");
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    NSLog(@"touchesEnded (tapCount:%d)", touch.tapCount);
        [super touchesEnded:touches withEvent:event];
}

-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
        NSLog(@"touches cancelled");
}

我得到这样的输出：

> touchesBegan (tapCount:1)
> touchesCancelled 
> touchesBegan (tapCount:1) 
> touches moved 
> touches moved
> touches moved 
> touchesCancelled

似乎我从未得到过touchesEnded活动.

有任何想法吗？

最佳答案 我像这样继承UITextview,这似乎有效,即使使用IOS 5.0.1.关键是要覆盖touchesBegan,而不仅仅是touchesEnded(这是我真正感兴趣的).

@implementation MyTextView


- (id)initWithFrame:(CGRect)frame {
    return [super initWithFrame:frame];
}

- (void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event { 
    // If not dragging, send event to next responder
    if (!self.dragging) 
        [self.nextResponder touchesBegan: touches withEvent:event]; 
    else
        [super touchesBegan: touches withEvent: event];
}

- (void) touchesEnded: (NSSet *) touches withEvent: (UIEvent *) event { 
    // If not dragging, send event to next responder
    if (!self.dragging) 
        [self.nextResponder touchesEnded: touches withEvent:event]; 
    else
        [super touchesEnded: touches withEvent: event];
}

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    if (action == @selector(paste:))
        return NO;
    if (action == @selector(copy:))
        return NO;
    if (action == @selector(cut:))
        return NO;
    if (action == @selector(select:))
        return NO;
    if (action == @selector(selectAll:))
        return NO;
    return [super canPerformAction:action withSender:sender];
}

- (BOOL)canBecomeFirstResponder {
    return NO;
}

- (void)dealloc {
    [super dealloc];
}
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