使UILabel消失

Question

我正在开发一个儿童应用程序，需要在几秒钟后让答案消失 我需要添加什么？

- (IBAction)calculate2:(id)sender
{     
    float aaaa = 6;     
    Answer2.text = [ [NSString alloc] initWithFormat:@"%.0f ",aaaa];      
}

Answer 1

-(void) hideLabel
{
      [Answer2 setHidden:YES];
}

只需将[self performSelector:@selector(hideLabel) withObject:nil afterDelay:4]添加到calculate2

即可

Answer 2

为了隐藏它非动画，它将是：

[label setHidden:YES];

但如果你想用动画隐藏它，可能是：

[UIView animatedwithduration:1.0f delay:.35f animations:{

label.alpha = 0.0;


}completion:{
[label removeFromSuperview];
//Here you can put a completed code
}];

希望它有所帮助！

Answer 3

使用NSTimer并提及UILabel指定的时间消失：

- (IBAction)calculate2:(id)sender
{     
    float aaaa = 6;     
    Answer2.text = [[NSString alloc] initWithFormat:@"%.0f ",aaaa];

    [NSTimer scheduledTimerWithTimeInterval:2.0
                                     target:self
                                   selector:@selector(targetMethod:)
                                   userInfo:nil
                                    repeats:NO];
}

-(void)targetMethod:(NSTimer*)timer
{
    //toggle hidden parameter
    [Answer2 setHidden:!Answer2.hidden];
}