双击uitextview

Question

如果用户双击它，我只想让我的uitextview可以编辑。

但是在我的代码中它只能运行一次。隐藏键盘后，双击停止 像我想的那样工作。它只显示“复制和定义”弹出窗口，如果我第二次尝试...

也许“textViewDidEndEditing”不适合这个......

以下是代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    CGFloat screen_height = [UIScreen mainScreen].bounds.size.height;
    CGFloat screen_width  = [UIScreen mainScreen].bounds.size.width;

    scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0,0,screen_width,screen_height)];
    scrollView.showsVerticalScrollIndicator=NO;
    scrollView.scrollEnabled=NO;
    scrollView.userInteractionEnabled=YES;
    [scrollView setBackgroundColor:[UIColor colorWithRed: 0.0 green: 0.0 blue: 0.0 alpha: 0.5]];
    [self.view addSubview:scrollView];
    scrollView.contentSize = CGSizeMake(screen_width,screen_height);

    MyTextView = [[UITextView alloc]initWithFrame:CGRectMake(0, 0, screen_width, screen_height)];
    MyTextView.text = @"Headline\nNo1";
    MyTextView.textColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0];
    [MyTextView setFont:[UIFont fontWithName:@"Helvetica" size:90]];
    MyTextView.textAlignment = NSTextAlignmentCenter;
    MyTextView.delegate = self;
    [MyTextView setScrollEnabled:NO];
    [MyTextView setEditable:NO];
    [MyTextView setUserInteractionEnabled:YES];
    [MyTextView setBackgroundColor:[UIColor colorWithRed: 0.0 green: 0.0 blue: 0.0 alpha: 0.0]];
    [MyTextView sizeToFit];
    [scrollView addSubview:MyTextView];

    // TAP
    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];
    [doubleTap setNumberOfTapsRequired:2];
    [doubleTap setNumberOfTouchesRequired:1];
    [MyTextView addGestureRecognizer:doubleTap];

    // KEYBOARD
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];
}


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

    NSLog(@"View: %@", [[sender view] class]);
    UITextView *tappedView = (UITextView *)[sender view];
    [tappedView setEditable:YES];
    [tappedView becomeFirstResponder];
}


-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {

    if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {

        if (((UITapGestureRecognizer *)gestureRecognizer).numberOfTapsRequired == 2) {
            return YES;
        }
    }
    return YES;
}


-(BOOL)canBecomeFirstResponder {

    if (MyTextView.editable == YES) {
        return YES;
    }
    else {
        return NO;
    }
}


- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGesture {

    return YES;
}


-(void)textViewDidEndEditing:(UITextView *)textView {

    [textView setEditable:NO];
}


-(void)keyboardDidHide:(NSNotification *)aNotification {

    NSLog(@"keyboardDidHide");

    // [textView setEditable:NO]; // same result like textViewDidEndEditing
}

Answer 1

从方法中删除/评论[textView setEditable:NO]; -(void)textViewDidEndEditing:(UITextView *)textView。

这是唯一让你麻烦的想法。因为停止编辑UITextView / UItextField模式的最佳方法是resignFirstReponder方法调用。

修改

对于隐藏键盘，在viewDidLoad方法

中添加以下行

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard)];
[self.view addGestureRecognizer:singleTap];

按以下方式添加hideKeyboard

-(void) hideKeyboard
{
    [MyTextView resignFirstResponder];
}

Answer 2

如果在文本视图上方添加清晰视图并在清晰视图上添加双击手势，事情就会变得简单。 当识别出双击时，删除清除视图并使textview成为第一响应者

[clearView removeFromSuperview] ;
[textview becomeFirstResponder] ;