UITextView触发事件没有触发

Question

我有一个UITextView，我想检测一个水龙头。

它看起来像我会很简单覆盖touchesEnded:withEvent和检查[[touches anyObject] tapCount] == 1，但是这个事件甚至没有火灾。

如果我覆盖了4个事件是这样的：

-(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"); 
} 

我得到的输出是这样的：

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

我似乎从来没有得到过touchesEnded事件。

任何想法？

Answer 1

更新：我在这里结束了使用该技术： https://devforums.apple.com/message/94569#94569

我不知道这是否是一个错误或没有，但UITextView的确实需要利用触摸事件做复印的弹出式菜单&粘贴为3.0，以便可以解释为什么它吞噬此事件。

如果你问我的话，会很蹩脚。

更新：我的博客上讲述这个位置：http://benscheirman.com/2009/07/detecting-a-tap-on-a-uitextview

Answer 2

您可以通过覆盖canPerformAction:withSender:方法来关闭剪切/复制/粘贴，因此您可以只对所有您不想允许的操作返回NO。

见UIResponder documentation ...

希望这将阻止你的触摸被吃掉。

Answer 3

我子类UITextView的像这样，这似乎工作，即使有IOS 5.0.1。关键是要重写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]; 
}