Question

我想在用户滑动UISlider的拇指时移动我的imageview，图像视图也应该具有滑块的值。有没有人对此有任何想法？这是代码片段：

   -(void)addSliderX:frame andminimumValue:(int)min andmaximumValue:(int)max andSliderValue:(int)value{
    CGRect frame1 = CGRectFromString(frame);
    statSlider = [[UISlider alloc]initWithFrame:frame1];
    [statSlider setMinimumTrackImage:[[UIImage imageNamed:@"greenSlider.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:10.0] forState:UIControlStateNormal]; 
    [statSlider setThumbImage:[UIImage imageNamed:@"sliderBar_greenThumb.png"] forState:UIControlStateNormal];
    [statSlider setMinimumValue:min];
    [statSlider setMaximumValue:max];
    statSlider.continuous = YES;
    [statSlider addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged];
    [statSlider addTarget:self action:@selector(sliderChanged:) forControlEvents:UIControlEventTouchUpInside];
    //bubbleViewController = [[SFNDoorBubbleViewController alloc]initWithNibName:@"SFNDoorBubbleViewController"bundle:[NSBundle mainBundle]];

    //popoverController = [[UIPopoverController alloc] initWithContentViewController:bubbleViewController];
    //[popoverController setPopoverContentSize:bubbleViewController.view.frame.size];
    [self.view addSubview:statSlider]; 
}
-(void)valueChanged:(id)sender{


    UISlider *localSlider = (UISlider *)sender;
    bubble = [[UIView alloc]init];
    back = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"sliderBar_handle_number.png"]];
    greenSliderValue = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%3.0f", [localSlider value]]];
    UILabel * val = [[UILabel alloc]init];

    dsp =[greenSliderValue floatValue];
    val.text = greenSliderValue;
    [bubbleViewController updateSliderValueTo:dsp];
    CGFloat sliderMax = localSlider.maximumValue;
    CGFloat sliderMin = localSlider.minimumValue;

    CGFloat sliderMaxMinDiff = sliderMax - sliderMin;
    CGFloat sliderValue = dsp;

    if(sliderMin < 0.0) {

        sliderValue = dsp-sliderMin;
        sliderMax = sliderMax - sliderMin;
        sliderMin = 0.0;
        sliderMaxMinDiff = sliderMax - sliderMin;
    }

    CGFloat xCoord = ((sliderValue-sliderMin)/sliderMaxMinDiff)*[localSlider frame].size.width-bubbleViewController.view.frame.size.width/2.0;

    CGFloat halfMax = (sliderMax+sliderMin)/2.0;

    if(sliderValue > halfMax) {

        sliderValue = (sliderValue - halfMax)+(sliderMin*1.0);
        sliderValue = sliderValue/halfMax;
        sliderValue = sliderValue*11.0;

        xCoord = xCoord - sliderValue;
    }

    else if(sliderValue <  halfMax) {

        sliderValue = (halfMax - sliderValue)+(sliderMin*1.0);
        sliderValue = sliderValue/halfMax;
        sliderValue = sliderValue*11.0;

        xCoord = xCoord + sliderValue;
    }
    [self.view addSubview:bubble];
    [bubble addSubview:back];
    [bubble addSubview:val];
    bubble.frame = CGRectMake(xCoord, 500, bubbleViewController.view.frame.size.width, bubbleViewController.view.frame.size.height);

}

Answer 1

每次调用changedValue:时，您都会创建一个新的UIView，UIImageView和UILabel。
而不是编辑旧实例。这导致所有旧的UIViews构建了一条“路径”。

在viewDidLoad中，您可以创建这三个视图，并在每个.tag property上设置 viewDidLoad

UIView* bubble = [[UIView alloc]init];
UIImageView* back = [[UIImageView alloc]initWithImage:[UIImageimageNamed:@"sliderBar_handle_number.png"]];
UILabel * val = [[UILabel alloc]init]
//other configurations ...
bubble.tag = 1;
back.tag = 2;
val.tag = 3; 
[self.view addSubview:bubble];
[bubble addSubview:back];
[bubble addSubview:val];

现在删除所有分配，因为我们想重用现有的视图。我们知道他们的标签的（无效）的valueChanged：（ID）发送

UISlider *localSlider = (UISlider *)sender; NSString* greenSliderValue = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%3.0f", [localSlider value]]]; UIView *bubble = (UIView*)[self.view.subviews viewWithTag:1]; UIImageView *back = (UIImageView*)[bubble.subviews viewWithTag:2]; UILabel *val = (UILabelw*)[bubble.subviews viewWithTag:3]; dsp =[greenSliderValue floatValue]; val.text = greenSliderValue; [bubbleViewController updateSliderValueTo:dsp]; CGFloat sliderMax = localSlider.maximumValue; CGFloat sliderMin = localSlider.minimumValue; CGFloat sliderMaxMinDiff = sliderMax - sliderMin; CGFloat sliderValue = dsp; if(sliderMin < 0.0) { sliderValue = dsp-sliderMin; sliderMax = sliderMax - sliderMin; sliderMin = 0.0; sliderMaxMinDiff = sliderMax - sliderMin; } CGFloat xCoord = ((sliderValue-sliderMin)/sliderMaxMinDiff)*[localSlider frame].size.width-bubbleViewController.view.frame.size.width/2.0; CGFloat halfMax = (sliderMax+sliderMin)/2.0; if(sliderValue > halfMax) { sliderValue = (sliderValue - halfMax)+(sliderMin*1.0); sliderValue = sliderValue/halfMax; sliderValue = sliderValue*11.0; xCoord = xCoord - sliderValue; } else if(sliderValue < halfMax) { sliderValue = (halfMax - sliderValue)+(sliderMin*1.0); sliderValue = sliderValue/halfMax; sliderValue = sliderValue*11.0; xCoord = xCoord + sliderValue; } bubble.frame = CGRectMake(xCoord, 500, bubbleViewController.view.frame.size.width, bubbleViewController.view.frame.size.height);

现在您可以使用现有实例

有没有办法通过移动滑块拇指来移动我的imageview？

1 个答案: