按下UIButton时运行功能

Question

我正在使用iPhone作为控制器来建造遥控车。

我建立了一个简单的按钮，如下所示：

-(void)moveArduinoForward
{
    UInt8 buf[3] = {0x01, 0x00, 0x00};
    buf[1] = 50;
    buf[2] = (int)num >> 8;
    NSData *data = [[NSData alloc] initWithBytes:buf length:3];
    [self.bleShield write:data];
}

-(void)stopArduino
{
    UInt8 buf[3] = {0x05, 0x00, 0x00};
    buf[1] = 50;
    buf[2] = (int)num >> 8;
    NSData *data = [[NSData alloc] initWithBytes:buf length:3];
    [self.bleShield write:data];
}



self.moveForwardButton  = [UIButton buttonWithType:UIButtonTypeCustom];
self.moveForwardButton.frame = CGRectMake(430.0, 175.0, 117.0, 133.0);
[self.moveForwardButton  setImage:[UIImage imageNamed:@"fwdUp.png"] forState:UIControlStateNormal];
[self.moveForwardButton  setImage:[UIImage imageNamed:@"fwdDown.png"] forState:UIControlStateHighlighted];
[self.moveForwardButton addTarget:self action:@selector(moveArduinoForward) forControlEvents:UIControlEventTouchDown];
[self.moveForwardButton addTarget:self action:@selector(stopArduino) forControlEvents:UIControlEventTouchUpInside | UIControlEventTouchUpOutside];
[self.view addSubview:self.moveForwardButton];

这目前无法正常运行。 当手指触摸按钮时，它仅触发一次moveArduinoForward事件。 我希望它不断开火。 我已经尝试了多种方法，但没有用，有什么想法吗？

Answer 1

您可以通过使用计时器来实现。

在.h或.m文件中声明一个计时器，例如：

NSTimer *timer;

并实现您的方法，例如：

// This method will be called when timer is fired
- (void)timerFired
{
    UInt8 buf[3] = {0x01, 0x00, 0x00};
    buf[1] = 50;
    buf[2] = (int)num >> 8;
    NSData *data = [[NSData alloc] initWithBytes:buf length:3];
    [self.bleShield write:data];
}

// This method schedules the timer
-(void)moveArduinoForward
{
    // You can change the time interval as you need
    timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];
}

// This method invalidates the timer, when you took your finger off from button
-(void)stopArduino
{
    [timer invalidate];
    timer = nil;
    UInt8 buf[3] = {0x05, 0x00, 0x00};
    buf[1] = 50;
    buf[2] = (int)num >> 8;
    NSData *data = [[NSData alloc] initWithBytes:buf length:3];
    [self.bleShield write:data];
}

Answer 2

在没有NSTimer的情况下执行此操作的一种方法是，如果仍然按下该按钮，则只是获得再次调用自身的方法。 使用计时器可能会使您动摇不定。

- (void)moveArduinoForward
{
    UInt8 buf[3] = {0x01, 0x00, 0x00};
    buf[1] = 50;
    buf[2] = (int)num >> 8;
    NSData *data = [[NSData alloc] initWithBytes:buf length:3];
    [self.bleShield write:data];

    if (self.moveForwardButton.isHighlighted) {
        [self moveArduinoForward];
    }
}

isHighlighted / isSelected。 我想可以用。

如果需要延迟，可以将[self moveArduinoForward]行替换为[self moveArduinoForward] [self performSelector:@selector(moveArduinoForward) withObject:nil afterDelay:1]