iOS模拟键盘长按删除

最近做第三方键盘开发，模拟键盘的长按删除

删除按钮上添加长按事件：

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizeralloc] initWithTarget:selfaction:@selector(deleteMore:)];

[deleteBtn addGestureRecognizer:longPress];

事件响应：

- (void)deleteMore:(UILongPressGestureRecognizer*)sender {

    if (sender.state ==UIGestureRecognizerStateBegan) {

        [selfbeginDelete];

    } elseif (sender.state ==UIGestureRecognizerStateEnded){

        [selfendDelete];

    }

}

- (void)beginDelete {

    [self.timerinvalidate];

    self.timer =nil;

    self.timer = [NSTimertimerWithTimeInterval:0.1repeats:YESblock:^(NSTimer *_Nonnull timer) {

        [self.textDocumentProxydeleteBackward];

    }];

    [[NSRunLoopmainRunLoop]addTimer:self.timerforMode:NSRunLoopCommonModes];

}

- (void)endDelete {

    [self.timerinvalidate];

    self.timer =nil;

}

注意：beginDelete中timer支持10以上api，如果需要支持10以下请改为：

- (void)deleteMore:(UILongPressGestureRecognizer*)sender {

    if (sender.state ==UIGestureRecognizerStateBegan) {

        [selfbeginDelete];

    } elseif (sender.state ==UIGestureRecognizerStateEnded){

        [selfendDelete];

    }

}

- (void)beginDelete {

    [self.timer invalidate];

    self.timer = nil;

    self.timer = [NSTimer timerWithTimeInterval:0.1 target:self selector:@selector(delete:) userInfo:nil repeats:YES];

    [[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

}

- (void)endDelete {

    [self.timer invalidate];

    self.timer = nil;

}

- (void)delete:(NSTimer*)timer {

    [self.textDocumentProxy deleteBackward];

}