当用户在UITextView
中使用两根手指点击时,是否有人知道调用哪些方法?
当用户用两根手指点击时,会选择段落中的整个文本。我想以编程方式实现相同的选择,以便在我的自定义单击手势方法中选择此段落。
答案 0 :(得分:2)
根据UITextView
双击手势识别器的默认行为判断,我认为selectAll:
是调用来处理文本选择的方法。您可以使用现有selectAll:
方法中的tapTextViewGesture:
(如评论中所述),在识别单击手势识别器时强制您的文字视图选择文字。
如果您希望文本选项自动显示以响应默认的双击手势识别器(即剪切,复制,粘贴等),请将selectAll:
设置为self
:< / p>
- (IBAction)tapTextViewGesture:(id)sender {
[self.textView selectAll:self];
}
否则,只需选择文字而不显示菜单,请将其设置为nil
:
- (IBAction)tapTextViewGesture:(id)sender {
[self.textView selectAll:nil];
}
<强>更新强>
正如OP在评论中指出的那样,UITextView
双击手势识别器最初只会导致选择一个段落。
首先,从当前光标位置显示编辑菜单:
// Access the application's shared menu
UIMenuController *menu = [UIMenuController sharedMenuController];
// Calculate the cursor's position within the superview
// and convert it to a CGRect
CGPoint cursorPosition = [self.textView caretRectForPosition:self.textView.selectedTextRange.start].origin;
CGPoint cursorPositionInView = [self.textView convertPoint:cursorPosition toView:self.view];
CGRect menuRect = CGRectMake(cursorPositionInView.x, cursorPositionInView.y, 0, 0);
// Show the menu from the cursor's position
[menu setTargetRect:menuRect inView:self.view];
[menu setMenuVisible:YES animated:YES];
然后选择当前段落,这是我的建议:
// Break the text into components separated by the newline character
NSArray *paragraphs = [self.textView.text componentsSeparatedByString:@"\n"];
// Keep a tally of the paragraph character count
int characterCount = 0;
// Go through each paragraph
for (NSString *paragraph in paragraphs) {
// If the total number of characters up to the end
// of the current paragraph is greater than or
// equal to the start of the textView's selected
// range, select the most recent paragraph and break
// from the loop
if (characterCount + paragraph.length >= self.textView.selectedRange.location) {
[self.textView setSelectedRange:NSMakeRange(characterCount, paragraph.length)];
break;
}
// Increment the character count by adding the current
// paragraph length + 1 to account for the newline character
characterCount += paragraph.length + 1;
}
答案 1 :(得分:1)
请参阅UITextInputTokenizer
协议参考:
采用UITextInputTokenizer协议的类的实例是一个标记化器;标记化器允许文本输入系统评估不同粒度的文本单元。始终参考存储或参考方向评估文本单位的粒度。
根据协议,使用- (UITextRange *)rangeEnclosingPosition:(UITextPosition *)position withGranularity:(UITextGranularity)granularity inDirection:(UITextDirection)direction
并将UITextGranularity设置为UITextGranularityParagraph
,以使用您设置的粒度检测textRange。
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if (touches.count == 2) {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.textView];
//calculate the distance from touch
UITextPosition *position = [self.textView closestPositionToPoint:touchLocation];
NSUInteger distanceFromTouch = [self.textView offsetFromPosition:self.textView.beginningOfDocument
toPosition:position];
//calculate the position by offset
UITextPosition *positionOffset = [self.textView positionFromPosition:self.textView.beginningOfDocument
offset:distanceFromTouch];
//set up the granularity
UITextGranularity granularity = UITextGranularityParagraph;
//implement the protocol
id<UITextInputTokenizer> tokenizer = self.textView.tokenizer;
UITextRange *textRange = [tokenizer rangeEnclosingPosition:positionOffset
withGranularity:granularity
inDirection:UITextWritingDirectionLeftToRight];
//select the textRange
[self.textView setSelectedTextRange:textRange];
self.textView.keyboardType = UIKeyboardTypeNamePhonePad;
}
}
不要忘记分配协议。 @interface ViewController ()<UITextInputTokenizer>