iphone - 如何在不禁用上下文菜单的情况下拦截UITextView上的长按？

我想截取UITextview上的长按，但不想同时禁用上下文菜单选项。

如果我在textview上使用手势识别器，它将禁用上下文菜单，因此我现在使用下面的方法。

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    //fire my method here
}

但是，只有在用户长按某些单词后显示上下文菜单时，才触发该方法。因此，当用户长按空白处时，只有放大镜出现，我当时无法启动该方法。

有谁有更好的主意？谢谢！

//////已解决的问题//////

感谢@danh和@Beppe，我什至可以在UITextView上轻按手势。我想通过长按在textview上显示字体栏。

@首先，我将UITextview子类化。

@interface LisgoTextView : UITextView {
    BOOL        pressing_;

}

@property (nonatomic)         BOOL      pressing;

@end


@interface LisgoTextView (private)
    - (void)longPress:(UIEvent *)event;
@end


@implementation LisgoTextView

@synthesize pressing = pressing_;


//--------------------------------------------------------------//
#pragma mark -- Long Press Detection --
//--------------------------------------------------------------//

- (void)longPress:(UIEvent *)event {

    if (pressing_) {

        //post notification to show font edit bar
        NSNotification *fontEditBarNotification = [NSNotification notificationWithName:@"fontEditBarNotification"
                                                                                object:nil userInfo:nil];
        [[NSNotificationCenter defaultCenter] postNotification:fontEditBarNotification];
    }
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    [self performSelector:@selector(longPress:) withObject:event afterDelay:0.7];
    pressing_ = YES;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];
    pressing_ = NO;
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesMoved:touches withEvent:event];
    pressing_ = NO;
}

@我使用延迟来解决我在UITextView上实现的轻击手势的冲突。

- (void)tapGestureOnTextView:(UITapGestureRecognizer *)sender {

    //cancel here if long press was fired first
    if (cancelTapGesture_) {
        return;
    }

    //don't fire show font bar
    cancelShowFontBar_ = YES;
    [self performSelector:@selector(enableShowFontBar) withObject:nil afterDelay:1.0];

    //method here
}


- (void)showFontEditBar {

    //cancel here if tap gesture was fired first
    if (cancelShowFontBar_) {
        return;
    }

    if (fontEditBarExists_ == NO) {

        //method here

        //don't fire tap gesture
        cancelTapGesture_ = YES;
        [self performSelector:@selector(enableTapGesture) withObject:nil afterDelay:1.0];
    }
}

- (void)enableTapGesture {
    cancelTapGesture_ = NO;
}

- (void)enableShowFontBar {
    cancelShowFontBar_ = NO;
}

最佳答案

除非文档明确建议，否则我通常避免子类化，这对我有用。长按和上下文菜单。糟糕-答案由@Beppe加载。英雄所见略同 ：-）

@interface TextViewSubclass ()
@property(assign,nonatomic) BOOL pressing;
@end

@implementation TextViewSubclass
@synthesize pressing=_pressing;

- (void)longPress:(UIEvent *)event {
    NSLog(@"long press");
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    self.pressing = YES;
    [self performSelector:@selector(longPress:) withObject:event afterDelay:2.0];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];
    [NSObject cancelPreviousPerformRequestsWithTarget:self];
    self.pressing = NO;
}
@end