双击 uitextview

Posted 2023-02-27

【中文标题】双击 uitextview

【英文标题】：Double tap uitextview

【发布时间】：2013-12-06 09:48:50

【问题描述】：

如果用户双击它，我只想让我的 uitextview 可编辑。

但在我的代码中它只工作一次。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，如果我再次尝试...

也许“textViewDidEndEditing”不是正确的方法......

代码如下：

- (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

【参考方案1】：

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

这是唯一给你带来麻烦的想法。因为停止 UITextView/UItextField 编辑模式的最佳方法是resignFirstReponder 方法调用。

编辑

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];

比添加hideKeyboard如下

-(void) hideKeyboard

    [MyTextView resignFirstResponder];

【讨论】：

像魅力一样工作！坦克你！

【参考方案2】：

如果你在 textview 上方添加一个 clear view 并在 clear view 上添加双击手势，事情会很简单。 当双击被识别时，移除 clear view 并让 textview 成为第一响应者

[clearView removeFromSuperview] ;
[textview becomeFirstResponder] ;

【讨论】：

我会试试的。感谢您的“务实”想法！