objective-c - 双击按钮时NSTimer不会停止

Question

当我点击按钮时，我必须NSTimer在 2 秒后显示图像。当我单击按钮时它工作正常，但问题是当我双击按钮时，NSTimer 没有停止。连续显示图像（调用NSTimer方法），而无需单击下次按钮。NSTimer当我一次双击/多次单击该按钮时如何停止。

*This is my Code*

-(void)buttonClicked
{

timer = [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:@selector(timerClicked) userInfo:nil repeats:YES];
imgviewtransparent.image = [UIImage imageNamed:[imagesArray objectAtIndex:i]];
}


-(void)timerClicked
{
    [timer invalidate];
    timer = nil; 

}

Answer 1

双击它会安排计时器两次。如果需要，您可以创建一个BOOL属性来避免这种情况。

-(void)viewDidLoad{
    [super viewDidLoad];
    //Define all your implementation

    //Set BOOL property to no at start
    self.isButtonClicked = NO; // You need to define this BOOL property as well.
}

-(void)buttonClicked {
    // Return if one click is already in process
    if (self.isButtonClicked) {
        return;
    }

    self.isButtonClicked = YES:
    timer = [NSTimer scheduledTimerWithTimeInterval:0.2 target:self         
    selector:@selector(timerClicked) userInfo:nil repeats:YES];
    imgviewtransparent.image = [UIImage imageNamed:[imagesArray objectAtIndex:i]];
}


-(void)timerClicked {
    [timer invalidate];
    timer = nil; 
    self.isButtonClicked = NO;
}