如何模拟双击UITextField

Question

当我在UITextfield中写一些东西并双击它时，它会在ios设备上显示"选择"、"全选"、"粘贴"选项。我想通过编程显示相同的消息。

有人能提出做这件事的方法吗？

双击不会因以下代码而起火。

+(void)performanualTouch:(UITouch*)touch {
 UIEvent *eventDown = [[UIEvent alloc] initWithTouch:touch];

    for (UIGestureRecognizer* gr in touch.view.gestureRecognizers) {       
        if ([gr isKindOfClass:[UITapGestureRecognizer class]]) {
            [gr touchesBegan:[eventDown allTouches] withEvent:eventDown];
            [touch setThePhase:UITouchPhaseEnded];
            UIEvent *eventUp = [[UIEvent alloc] initWithTouch:touch]; 
            [gr touchesEnded:[eventUp allTouches] withEvent:eventUp];
            [eventUp release];

            if (gr.cancelsTouchesInView) {
                return;
            }
        }
    }

 [touch.view touchesBegan:[eventDown allTouches] withEvent:eventDown];
 [[UIApplication sharedApplication] sendEvent:eventDown];
 [touch setThePhase:UITouchPhaseEnded];
 UIEvent *eventUp = [[UIEvent alloc] initWithTouch:touch];
 [touch.view touchesEnded:[eventUp allTouches] withEvent:eventUp];
 [[UIApplication sharedApplication] sendEvent:eventUp];
 [eventDown release];
 [eventUp release];
}

感谢

Answer 1

您可以在这里找到涵盖这一特殊需求的文档

相关部分：

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *theTouch = [touches anyObject];
if ([theTouch tapCount] == 2  && [self becomeFirstResponder]) {
    // selection management code goes here...
    // bring up edit menu.
    UIMenuController *theMenu = [UIMenuController sharedMenuController];
    CGRect selectionRect = CGRectMake (currentSelection.x, currentSelection.y, SIDE, SIDE);
    [theMenu setTargetRect:selectionRect inView:self];
    [theMenu setMenuVisible:YES animated:YES];
}
}