Question

我已经尝试过这段代码但工作不正常。在UISlider的值变化中我调用了这个方法...

@property (strong, nonatomic) IBOutlet UISlider *r;
@property (strong, nonatomic) IBOutlet UISlider *g;
@property (strong, nonatomic) IBOutlet UISlider *b;
@property (strong, nonatomic) IBOutlet UILabel *colorLabel;

- (void)viewDidLoad
{
    [super viewDidLoad];

    _r.minimumValue=0;
    _r.maximumValue=255;

    _g.minimumValue=0;
    _g.maximumValue=255;

    _b.minimumValue=0;
    _b.maximumValue=255;

    // Do any additional setup after loading the view, typically from a nib.
}

-(void)sliderValueChanged:(UISlider*)slider
{
    [_colorLabel setBackgroundColor:[UIColor colorWithRed:_r.value green:_g.value blue:_b.value alpha:1]];
}

如果有任何想法，请帮助..

Answer 1

UIColor方法将每个组件参数放在0 to 1范围内，因此您需要在传递滑块值之前将其除以255.0。

Answer 2

试试这个（忽略alpha滑块，这是我自己对类似任务的实际解决方案）：

保持心情：让你的滑块从0变为1，以避免分裂到255.

.h文件：

IBOutlet UISlider *rSlider;
IBOutlet UISlider *gSlider;
IBOutlet UISlider *bSlider;

.m文件

-(void)blueSlider:(id)sender
{
    bSlider = (UISlider *)sender;
    UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:alphaSlider.value];
    colorView.backgroundColor = newColor;
}



-(void)greenSlider:(id)sender
{
    gSlider = (UISlider *)sender;
    UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:alphaSlider.value];
    colorView.backgroundColor = newColor;
}


-(void)redSlider:(id)sender
{
    rSlider = (UISlider *)sender;
    UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:alphaSlider.value];
    colorView.backgroundColor = newColor;
}

Answer 3

使用您的设置颜色方法

-(void)sliderValueChanged:(UISlider*)slider
{
    float r=[[NSString stringWithFormat:@"%.0f",_r.value] floatValue];
    float g=[[NSString stringWithFormat:@"%.0f",_g.value]floatValue];
    float b=[[NSString stringWithFormat:@"%.0f",_b.value]floatValue];

    UIColor *colorToSet=[UIColor colorWithRed:(r/255.0f) green:(g/255.0f) blue:(b/255.0f) alpha:1];
    [_colorLabel setBackgroundColor:colorToSet];
}

Check Sample

Answer 4

对于你的Exothug

如果滑块值仅从0到1

-(IBAction)sliderValue:(UISlider*)sender
{
    UIColor *newColor = [UIColor colorWithRed:rSlider.value green:gSlider.value blue:bSlider.value alpha:1];
    _colorLabel.backgroundColor = newColor;
}

Answer 5

首先在Main.storyboard中创建3个滑块
其次创建所有滑块动作 EX :. Red_slider，Green_slider，Blue_slider
第三个创建3个标签及其出口

现在在ViewCotroller

中

Enter code in ViewController.swift same as like Image

如何从UISlider获取RGB颜色值

5 个答案: