Question

可能重复：
Way to make a UIButton continuously fire during a press-and-hold situation?

我在相机视图中有两个自定义按钮，一个是放大，另一个是缩小按钮按下的值将增加1,2...，但我想按下放大或缩小按钮时值会自动增加并释放按钮值会停止，怎么样？请任何人帮助我

我尝试了代码

zoomin=[UIButton buttonWithType:UIButtonTypeCustom];
    zoomin.frame=CGRectMake(60, 410, 60, 60);
    [zoomin setBackgroundImage:[UIImage imageNamed:@"zoomplus.png"] forState:UIControlStateNormal];
    [zoomin addTarget:self action:@selector(CameraZoomIn) forControlEvents:UIControlEventTouchUpInside];
    [buttonView addSubview:zoomin];

-(void)CameraZoomIn
{
    x=x+0.090253;
    y=y+0.090253;
    NSLog(@"X : %f, Y : %f",x,y);
    imgpicker.cameraViewTransform = CGAffineTransformMakeScale(x,y);
}

Answer 1

使用此代码..

 zoomin = [UIButton buttonWithType:UIButtonTypeCustom];
 zoomin = CGRectMake(60, 410, 60, 60);
 UIImage * zoominImage = [UIImage imageNamed:@"zoomplus.png"];
[zoomin setImage:jumpbtnImage forState:UIControlStateNormal];
 zoomin.backgroundColor = [UIColor clearColor];
[zoomin addTarget:self action:@selector(CameraZoomIn) forControlEvents:UIControlEventTouchDown];
[zoomin addTarget:self action:@selector(stopZoom) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview: zoomin];

Answer 2

您需要设置NSTimer，该x会在UIControlEventTouchDown上每隔UIControlEventTouchUpInside次触发，并在UIControlEventTouchCancel或{{1}}停止。当该计时器启动时 - ＆gt;用任何计数器，缩放或任何其他东西做你想做的事......

当我按下按钮值会自动增加，怎么样？

2 个答案: